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Oxygen saturation, e.g., oximeter

Subclass of:

600 - Surgery

600300000 - DIAGNOSTIC TESTING

600309000 - Measuring or detecting nonradioactive constituent of body liquid by means placed against or in body throughout test

600310000 - Infrared, visible light, or ultraviolet radiation directed on or through body or constituent released therefrom

600322000 - Determining blood constituent

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
600324000 And other cardiovascular parameters 221
600326000 And other blood constituents 35
600340000 Measured at specified areas of body portions 21
600339000 Inserted in body 14
600336000 Detects constituents while excluding components (e.g., noise) 7
600331000 Calibrated 6
600335000 Pressurization of body portion performed 6
600333000 Used in conjunction with associated apparatus (e.g., pacemaker) 3
20100041970IMPLANTABLE MEDICAL DEVICE - An implantable medical device has an oxygen sensor adapted to measure the level of oxygen in oxygenized blood, and to generate an oxygen measurement signal in dependence of the level of oxygen. The oxygen sensor is adapted to perform measurements inside the heart, of blood entering the left atrium of a patient's heart. The obtained oxygen measurement signal is compared to a predetermined threshold level and an indication signal is generated in dependence of the comparison. The, indication signal is indicative of the lung functionality of the patient.02-18-2010
20110066018METHOD AND APPARATUS FOR POST-SHOCK EVALUATION USING TISSUE OXYGENATION MEASUREMENTS - A method and apparatus for controlling delivery of therapy that includes an emitting portion emitting light at a predetermined emitted light intensity to a volume of tissue at a plurality of wavelengths, and a detecting portion detecting the emitted light scattered by the volume of tissue to generate corresponding detected light intensity output signals. A control module adjusts the detected light intensity output signals for shifts in intensity corresponding to the emitted light intensity, and determines a tissue oxygenation index in response to only the adjusted detected light intensity output signals, and a therapy delivery module controlling therapy in response to the determined tissue oxygenation index.03-17-2011
20110066017METHOD AND APPARATUS FOR POST-SHOCK EVALUATION USING TISSUE OXYGENATION MEASUREMENTS - A method and apparatus for controlling delivery of therapy that includes an emitting portion emitting light at a predetermined emitted light intensity to a volume of tissue at a plurality of wavelengths, and a detecting portion detecting the emitted light scattered by the volume of tissue to generate corresponding detected light intensity output signals. A control module controls the light emission so that an emitted light intensity at each of the plurality of wavelengths is within a predetermined intensity range, and determines a tissue oxygenation index in response to only the detected light intensity output signals, and a therapy delivery module delivers therapy in response to the determined tissue oxygenation index.03-17-2011
600338000 Fetal tissue 2
20110118576Noninvasive fetal blood oxygen monitoring system and associated method - A method for non-invasively measuring the oxygen saturation of an in utero fetus's blood using near-infrared spectroscopy. Exemplary methods include placement of a sensor on the outside of the uterus approximate the placenta. Other exemplary methods include inserting a probe into the uterus. Sensors may be positioned approximate a particular portion of the fetus, such as the brain or kidney, to measure the oxygen saturation within the particular portion of the fetus.05-19-2011
20080221420Fetal Pulse Oximetry and ECG Sensor - A medical device configured to be temporarily secured at a tissue field, such as a fetal skull, via a spiral probe. The spiral probe functions to both secure the sensor in place and provide an electrode for ECG purposes. The spiral probe is non-uniform and includes one or more of a stop element, a cross bar element and a collapsed portion adapted to engage tissue after a predetermined rotation of the probe into the tissue field. The probe diameter can expand with an increase in torque applied to a drive rod, leading to disengagement of the drive rod from the probe. The spiral probe and drive rod may define a detent mechanism whereby upon reaching a predetermined torque the drive rod is disengaged from the probe and freely rotates without further entry of the spiral probe into the tissue field.09-11-2008
600330000 Separation of ac/dc components in signal 2
20090326353PROCESSING AND DETECTING BASELINE CHANGES IN SIGNALS - According to embodiments, systems and methods for detecting the occurrence of events from a signal are provided. A signal processing system may analyze baseline changes and changes in signal characteristics to detect events from a signal. The system may also detect events by analyzing energy parameters and artifacts in a scalogram of the signal. Further, the system may detect events by analyzing both the signal and its corresponding scalogram.12-31-2009
20100286495Selection Of Signal Regions For Parameter Extraction - According to embodiments, techniques for extracting a signal parameter from a selected region of a generally repetitive signal are disclosed. A pulse oximetry system including a sensor or probe may be used to obtain an original photoplethysmograph (PPG) signal from a subject. A filter transformation may be applied to the original PPG signal to produce a baseline PPG signal. The baseline PPG signal may contain artifacts and/or noise, and a region of the baseline PPG signal suitable for extracting the signal parameter may be selected. A suitable region of the baseline PPG signal may be selected by applying one or more thresholds to the baseline PPG signal, where the values of the thresholds may be set based on derivative values, amplitude-based percentiles, and/or local minima and maxima of the baseline PPG signal. A portion of the original PPG signal corresponding to the selected region may be processed, and the signal parameter may be extracted from the processed region. In an embodiment, the signal parameter may correspond to the respiration rate of a patient.11-11-2010
600334000 With tissue perfusion 1
20100105997CLOSED LOOP PARAMETER ADJUSTMENT FOR SENSOR MODULES OF AN IMPLANTABLE MEDICAL DEVICE - In general, the invention is directed toward an implantable medical device that includes a controller and a plurality of sensor modules. The controller may control the sensor modules to perform one or more sensor actions in order to facilitate a measurement. The sensor modules may store one or more operational parameters that control various aspects of the sensor actions performed by the sensor modules. The controller may automatically adjust one or more of the operational parameters based on results received from previous measurements in order to provide closed loop parameter adjustment of the operational parameters associated with the sensor modules. The controller may communicate with the sensor modules via a common bus. Example measurements include tissue perfusion measurements, blood oxygen sensing measurements, sonomicrometry measurements, and pressure measurements.04-29-2010
Entries
DocumentTitleDate
20130030266PSYCHOLOGICAL STRESS INDEX MEASURING SYSTEM AND ANALYSIS METHOD - A psychological stress index measuring system and its analysis method comprise a pulse generator, a transmission-based photo sensor, a signal converter & amplifier, a filter and a processing platform. At first, the transmission-based photo sensor fixed on a user depends on a light transmitting mechanism to detect analog SpO01-31-2013
20090030296Predictive oximetry model and method - The invention comprises a method for determining oxygen saturation in a subject, comprising the steps of compiling a data base of measured spectral data that includes pulsatile AC and non-pulsatile DC components, and spectral values of oxyhemoglobin (oxyHb) and deoxyhemoglobin (deoxyHb); determining absorbed pulsatile components and non-pulsatile components as a function of the oxyHb and deoxyHb values; determining total pulsatile and non-pulsatile optical density as a function of the absorbed pulsatile and non-pulsatile components; determining a mathematical relationship between at least one pulsatile AC parameter and at least one non-pulsatile DC parameter; and estimating oxygen saturation based on the mathematical relationship.01-29-2009
20130085354TECHNIQUES FOR ACCURATELY DERIVING PHYSIOLOGIC PARAMETERS OF A SUBJECT FROM PHOTOPLETHYSMOGRAPHIC MEASUREMENTS - Several techniques are disclosed for isolating either heart or breath rate data from a photoplethysmograph, which is a time domain signal such as from a pulse oximeter. The techniques involve the use of filtering in the frequency domain, after a Fast Fourier Transform (FFT) has been conducted on a given photoplethysmograph also references as a given set of discrete time-domain data. The filtering may be applied to an identified fundamental frequency and one or more harmonics for heart related parameters. The filter may be truncated to the frequency data set and further applied multiple times to improve roll off. After filtering, an Inverse FFT (IFFT) is used to reconstruct the time-domain signal, except with undesirable frequency content eliminated or reduced. Calculation or measurement of parameters is then conducted on this reconstructed time-domain signal.04-04-2013
20100152560METHODS, SYSTEMS AND DEVICES FOR MONITORING RESPIRATORY DISORDERS - Methods, systems and devices are provided for monitoring respiratory disorders based on monitored factors of a photoplethysmography (PPG) signal that is representative of peripheral blood volume. The monitored factors can be respiratory effort as well as respiratory rate and/or blood oxygen saturation level. The systems and devices may or may not be implanted in a patient.06-17-2010
20090118603OPTICALLY ALIGNED PULSE OXIMETRY SENSOR AND TECHNIQUE FOR USING THE SAME - A physiological sensor is provided that includes an emitter and detector disposed on a frame such that the emitter and detector define an optical axis. The frame includes one or more pair of flexible elements disposed generally symmetric relative to the optical axis. In one embodiment, the emitter and detector remain aligned when moved relative to one another along the optical axis.05-07-2009
20100076281DEVICE AND METHOD FOR MONITORING BLOOD PARAMETERS - A device and method measuring at least one parameter related to the blood of a subject, by emitting light with at least one emitter at least one wavelength within the spectral range of 380 980 nm toward a body part containing at least one wavelength. Spatially resolved reflectance measurements are obtained by capturing light reflected by the body part with at least one reflectance detector. At least one of the absorption coefficient and the reduced scattering coefficient of the blood component of the body part at each of the wavelengths is extracted from the measurements. The temporal derivatives of the at least one of the absorption coefficient and the reduced scattering coefficient is extracted, and at least one blood related parameter is calculated using the temporal derivatives.03-25-2010
20120245441SIGNAL DEMODULATION - A method for processing an analog composite signal in a system has the steps of receiving a composite signal with at least one first signal component and at least one interfering signal component; filtering the composite signal with a filter having a transfer function H(s); sampling the filtered composite signal in periodic intervals wherein each periodic interval has n samples; forming a matrix equation representing the composite signal wherein the matrix equation has a signal vector with the at least first one signal component and the at least one interfering signal component and a matrix comprising weighted coefficients; solving the matrix equation to determine the at least one signal component; outputting the at least one signal component.09-27-2012
20130079607FIBEROPTIC PROBE FOR MEASURING TISSUE OXYGENATION AND METHOD FOR USING SAME - Embodiments herein relate to the field of medical monitoring, and, more specifically, to a fiberoptic probe for monitoring tissue oxygenation and a method for using such a probe. A non-invasive method of measuring tissue oxygenation includes, in some embodiments, illuminating a tissue surface with a first fiberoptic fiber, receiving light from the tissue surface with a second fiberoptic fiber, measuring the absorption spectra of oxy- and deoxy-hemoglobin in the light, and calculating a tissue oxygenation value based on the absorption spectra.03-28-2013
20130079606SYSTEMS AND METHODS FOR DETERMINING RESPIRATION INFORMATION FROM A PHOTOPLETHYSMOGRAPH - A patient monitoring system may receive a photoplethysmograph (PPG) signal including samples of a pulse waveform. The PPG signal may demonstrate morphology changes based on respiration. The system may calculate morphology metrics from the PPG signal, the first derivative of the PPG signal, the second derivative of the PPG signal, or any combination thereof. The morphology metrics may demonstrate amplitude modulation, baseline modulation, and frequency modulation of the PPG signal that is related to respiration. Morphology metric signals generated from the morphology metrics may be used to determine respiration information such as respiration rate.03-28-2013
20130035570APPARATUS AND METHOD FOR ACQUIRING INFORMATION ON SUBJECT - In an apparatus configured to acquire subject information, a light source is capable of generating light with a first wavelength and alight with a second wavelength different from the first wavelength, an acoustic wave detection unit detects a photoacoustic wave generated by illuminating a subject with light and output a resultant detection signal, and a signal processing unit acquires subject information based on a first detection signal output by the acoustic wave detection unit when the subject is illuminated with the light with the first wavelength and a second detection signal output by the acoustic wave detection unit when the subject is illuminated with the light with the second wavelength. An effective attenuation coefficient of the subject at the first wavelength is equal to an effective attenuation coefficient of the subject at the second wavelength.02-07-2013
20130079608IMPLANTABLE SENSOR METHOD AND SYSTEM - Systems and methods for non-vascular sensor implantation and for measuring physiological parameters in areas of a body where the physiological parameters are heterogeneous. An implant unit is implanted in an area of a body and a foreign body capsule is allowed to form around the implant unit area. A sensor may be directed into a body cavity such as, for example, the peritoneal space, subcutaneous tissues, the foreign body capsule, or other area. A subcutaneous area of the body may be tunneled for sensor placement. Spatially separated sensing elements may be used for detecting individual amounts of the physiological parameter. An overall amount of the physiological parameter may be determined by calculating a statistical measurement of the individual sensed amounts in the area. Another embodiment of the invention, a multi-analyte measuring device, may include a substrate having an electrode array on one side and an integrated circuit on another side.03-28-2013
20130041239IMMUNE AND OXYGEN SYSTEM MEASURING AND DRUG SCREENING METHOD AND APPARATUS - Method and apparatus for monitoring health as related to immune system function, and for measuring the effects of toxins and other stresses. A method for pre-screening drugs for the pharmaceutical pipeline. A method for using an Immunogram as a research tool. A method for preparing compounds or drugs for treatment, therapy, or cure of diseases.02-14-2013
20100145169METHODS AND SYSTEMS FOR DETECTING A CONDITION OF COMPARTMENT SYNDROME - Methods and systems for detecting and alerting one to a condition of Compartment Syndrome provide for determining concentration data of biochemical compounds in tissues, preferably at a shallow depth beneath the skin; analysing the concentration data to detect a condition of Compartment Syndrome; and triggering an alarm if a condition of Compartment Syndrome is detected. The concentration of biochemical compounds may be measured using Near Infrared Spectroscopy. The biochemical compounds may comprise at least one compound from the group consisting of Hemoglobin, Oxygenated Hemoglobin, Cytochromes and Myoglobin.06-10-2010
20080306365DECEPTION DETECTION AND QUERY METHODOLOGY FOR DETERMINING DECEPTION VIA NEUROIMAGING - Functional near-infrared (fNIR) neuroimaging is used to assess credibility, detect deception, and implement a query methodology for determining deception via neuroimaging. Oxygenation levels of portions of the brain are imaged via fNIR spectroscopy and utilized to determine if the subject is telling a lie or a truth. In an example configuration, oxygenation levels in the inferior and/or middle prefrontal cortical areas of the brain, such as the bilateral dorsolateral prefrontal and/or inferior frontal cortex, are measured to determine if a subject is lying relative to telling the truth. An example system includes a portable, flexible, belt like sensing device that is positioned proximate the subjects scalp. Sensed neural activity is transmitted either through wired or wireless means, to a processor for analysis of the sensed neural activity. The query methodology utilizes an attestation assertion that mitigates variance in brain responses due to the length or form of a question.12-11-2008
20090069653MEASUREMENT APPARATUS - A measurement apparatus includes a measurement unit which measures the spectroscopic characteristics of the inside of a specimen by irradiating a plurality of types of light, each of which has a different wavelength within the wavelength range of 600 nm to 1,000 nm, on the specimen, an arithmetic processing unit which calculates the ratio of both collagen and lipid relative to the whole of a plurality of ingredients including collagen and lipid from a measurement result of the measurement unit and the absorption coefficients of each ingredient, and determines the relationship of the fitting coefficients of the lipid and collagen and the state of biological tissue, and then determines the state of biological tissue of the specimen from the ratio of collagen and the ratio of lipid which were calculated, and a display unit which displays a result of processing by the arithmetic processing unit. The measurement unit uses a light having a predetermined wavelength within the wavelength range between 600 nm and 700 nm and at least two types of light having different wavelengths within the wavelength range between 730 nm to 760 nm as the plurality of types of light.03-12-2009
20130041238ELECTROCHEMICAL DISINFECTION OF IMPLANTED CATHETERS - An implantable catheter is provided that may be disinfected without removal from the body of a patient, using an electrochemical method to generate an electric field on the catheter surface and thus destroy microorganisms in a biofilm that is present or forming. A catheter system includes the implantable catheter and a voltage source that is operably connected to electrodes on or embedded in the exterior and optionally the interior catheter surface. Methods are also provided for disinfecting the implantable catheter in vivo and for detecting or confirming the presence of a pathogenic biofilm thereon.02-14-2013
20120215080APPARATUS, SYSTEM AND METHOD FOR TISSUE OXIMETRY - An apparatus, system and method for measuring oxygen concentration for exciting and detecting oxygen-sensitive fluorescence in biological tissues to detect oxygen levels (e.g., the partial pressure of oxygen).08-23-2012
20120165631SIGNAL PROCESSING APPARATUS - The present disclosure describes a method and an apparatus for analyzing measured signals using various processing techniques. In certain embodiments, the measured signals are physiological signals. In certain embodiments, the measurements relate to blood constituent measurements including blood oxygen saturation.06-28-2012
20120184830METHOD AND APPARATUS FOR NONINVASIVELY MONITORING PARAMETERS OF A REGION OF INTEREST IN A HUMAN BODY - Apparatus and methods are provided for monitoring a parameter of a region of interest (ROI) within a first tissue type within a body. A control unit drives a measurement unit to provide an operating condition such that acoustic waves overlap with a region within the ROI that is illuminated by illuminating light such as to generate a first set of tagged photons, and such that the acoustic waves overlap with a region of tissue within a second tissue type that is illuminated by illuminating light such as to generate a second set of tagged photons, the first and second sets of tagged photons being distinguishable from one another. The control unit determines the parameter of the ROI by extracting data portions associated with, respectively, the light response of the ROI and the light response of the second tissue type, by distinguishing between the sets of tagged photons.07-19-2012
20120184829APPARATUS FOR EXERCISE THERAPY AND DIAGNOSIS APPARATUS FOR LOWER EXTREMITY LIMB ARTERIAL OCCLUSIVE DISEASE - An exercise therapy device 07-19-2012
20130046157METHOD OF ANALYZING AND PROCESSING SIGNALS - A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.02-21-2013
20130046156METHOD OF ANALYZING AND PROCESSING SIGNALS - A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.02-21-2013
20130046155Arm board patient securement arrangement - An arm board securement arrangement for comfortably and safely securing a patient's arm to an arm board during an operative procedure, comprising a flexible sheet of conformable material having a first end and a second end, and a first side and a second side with a central portion therebetween. A plurality of spaced apart wrap members extend from the central portion on the first side thereof. A plurality of spaced apart wrap members extending on the second side from the central portion. A gripping or securement member is arranged on each of the wrap members to permit the wrap members to correspondingly engage one another about an arm of a patient.02-21-2013
20090326347Synchronous Light Detection Utilizing CMOS/CCD Sensors For Oximetry Sensing - This disclosure describes a system and method for measuring a physiological parameter, such as a SpO12-31-2009
20090318787PULSE OXIMETRY AND PULSE OXIMETER - A pulse oximetry includes: irradiating living tissue with a plurality of light beams of different wavelengths; receiving the light beams transmitted through or reflected from the living tissue and converting the received light beams to electric signals which correspond to the different wavelengths; time-segmenting time series data of the electric signals; calculating, with respect to each of the segmented time series data of the electric signals, a slope value of a regression line between each two of the electric signals; calculating SaO2 based on the slope value of each of the segmented time series data of the electric signals; constructing a histogram of SaO2 for each predetermined number of time segments; and obtaining a mode value from the histogram as SpO2 to be output of the pulse oximetry.12-24-2009
20130072770SYSTEM FOR SEAMLESS AND SECURE NETWORKING OF IMPLANTABLE MEDICAL DEVICES, ELECTRONIC PATCH DEVICES AND WEARABLE DEVICES - A system level scheme for networking of implantable devices, electronic patch devices/sensors coupled to the body, and wearable sensors/devices with cellular telephone/mobile devices, peripheral devices and remote servers is described.03-21-2013
20130060109TECHNIQUE FOR REMANUFACTURING A MEDICAL SENSOR - Remanufactured medical sensors and methods for remanufacturing used medical sensors are provided. Such a remanufactured sensor may include certain components from a used medical sensor and certain new components. For example, a remanufactured regional oximetry sensor may include a padding layer, an emitter and a pair of detectors, a flexible circuit coupled to the emitter and detectors, and a patient-contacting adhesive layer. The flexible circuit, the emitter, the first detector, the second detector, or any combination thereof, are from a used medical sensor, and the padding layer, the patient-contacting adhesive layer, or a combination thereof, are new.03-07-2013
20090270703MANUAL AND AUTOMATIC PROBE CALIBRATION - Embodiments of the present disclosure include an optical probe capable of communicating identification information to a patient monitor in addition to signals indicative of intensities of light after attenuation by body tissue. The identification information may indicate operating wavelengths of light sources, indicate a type of probe, such as, for example, that the probe is an adult probe, a pediatric probe, a neonatal probe, a disposable probe, a reusable probe, or the like. The information could also be utilized for security purposes, such as, for example, to ensure that the probe is configured properly for the oximeter, to indicate that the probe is from an authorized supplier, or the like. In one preferred embodiment, coding resistors could be provided across the light sources to allow additional information about the probe to be coded without added leads. However, any device could be used without it being used in parallel.10-29-2009
20130066173VENOUS OXYGEN SATURATION SYSTEMS AND METHODS - Methods and systems are discussed for determining venous oxygen saturation by calculating a ratio of ratios from respiration-induced baseline modulations. A calculated venous ratio of ratios may be compared with a look-up table value to estimate venous oxygen saturation. A calculated venous ratio of ratios is compared with an arterial ratio of ratios to determine whether baseline modulations are the result of a subject's respiration or movement. Such a determination is also made by deriving a venous ratio of ratios using a transform technique, such as a continuous wavelet transform. Derived venous and arterial saturation values are used to non-invasively determine a cardiac output of the subject.03-14-2013
20110021893PHYSIOLOGICAL SENSOR HAVING A WAIST - An exemplary sensor includes a sensor pad having a first portion and a second portion separated by a waist portion. The waist portion is narrower than the first portion and the second portion. A light source that is disposed on the first portion is configured to generate near-infrared light and transmit the near-infrared light through part of a patient's body. A light detector that is disposed on the second portion is configured to detect near-infrared light that has traveled through the part of the patient's body. The near-infrared light detected indicates an amount of oxygen in the part of the patient's body through which the near-infrared light traveled.01-27-2011
20110021892SYSTEMS AND METHODS FOR RESPIRATION MONITORING - According to embodiments, techniques for determining respiratory parameters are disclosed. More suitable probe locations for determining respiratory parameters, such as respiration rate and respiratory effort, may be identified. The most suitable probe location may be selected for probe placement. A scalogram may be generated from the detected signal at the more suitable location, resulting in an enhanced breathing band for determining respiratory parameters. Flexible probes that allow for a patient's natural movement due to respiration may also be used to enhance the breathing components of the detected signal. From the enhanced signal, more accurate and reliable respiratory parameters may be determined.01-27-2011
20090259117SYSTEM AND METHOD FOR DIFFERENTIATING BETWEEN TISSUE-SPECIFIC AND SYSTEMIC CAUSES OF CHANGES IN OXYGEN SATURATION IN TISSUE AND ORGANS - A method for monitoring oxygen saturation that includes the following steps: (i) measuring an oxygen saturation of a target area of a person or animal over time; (ii) measuring an oxygen saturation of a reference area of the person or animal over time; and (iii) classifying the oxygen saturation status of the target area based upon a comparison of the oxygen saturation of the target area relative to the oxygen saturation of the reference area over time.10-15-2009
20100081898Detecting A Probe-Off Event In A Measurement System - According to embodiments, techniques for detecting probe-off events are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, an energy decrease, a broadscale high-energy cone, a regular, repeated high-scale pattern, a low-scale information pattern; and a pulse band. The absence or presence of these and other characteristics, along with information about the characteristics, may be analyzed to detect a probe-off event. A confidence indicator may be calculated in connection with probe-off event detections and alarms may be generated when probe-off events occur.04-01-2010
20100087719METHOD AND APPARATUS FOR DETERMINING CEREBRAL DESATURATION IN PATIENTS UNDERGOING DEEP HYPOTHERMIC CIRCULATORY ARREST - A method and apparatus for determining cerebral oxygen saturation in a subject is provided. The method comprises the steps of: a) determining tissue oxygen saturation values using a NIRS type oximeter over a period of time; b) modeling a rate of change in the tissue oxygen saturation values; and c) determining an amount of time until a predetermined tissue oxygen saturation value is reached using the modeling of the tissue oxygen saturation values.04-08-2010
20130165757METHOD, ARRANGEMENT, SENSOR, AND COMPUTER PROGRAM PRODUCT FOR NON-INVASIVELY MEASURING HEMOGLOBIN CONCENTRATIONS IN BLOOD - A mechanism for non-invasively monitoring blood characteristics of a subject is disclosed. To enable measurement of hemoglobin concentrations in a cost-effective way, a computational model is established that represents a relationship between a first variable indicative of total hemoglobin concentration and a set of variables that includes second variables indicative of light transmission through tissue and third variables indicative of concentration percentages of different hemoglobin species. In-vivo measurement signals are acquired from a subject and in-vivo values are determined for the second and third variables based on the in-vivo measurement signals. The first variable is then solved based on the in-vivo values of the second and third variables and the computational model.06-27-2013
20120271129MULTI-FREQUENCY RF MODULATED NEAR INFRARED SPECTROSCOPY FOR HEMOGLOBIN MEASUREMENT IN BLOOD AND LIVING TISSUES - The present application discloses a tissue oximeter system which includes radio frequency (RF) wave sources configured to produce RF waves at different RF frequencies, near infrared (NIR) light sources each configured to emit NIR lights each modulated by one or more of the RF waves generated by the RF wave sources, an optical probe that directs the NIR lights modulated at different RF frequencies to a living tissue, and wherein the optical probe includes a plurality of light-emitting points that each can couple one of the NIR lights into the living tissue, one or more optical detectors that each can receive scattered lights from the living tissue and to convert the scattered lights into electronic signals, and a control and data acquisition unit that can calculate absolute level of [HbO], [Hb], or [SO2] based on the electronic signals.10-25-2012
20090043180SENSOR AND SYSTEM PROVIDING PHYSIOLOGIC DATA AND BIOMETRIC IDENTIFICATION - A device and method of use combining a non-invasive sensor for measuring a physiologic attribute with a biometric identification means. One embodiment of the device and method includes a sensor that has incorporated therein both an oximeter and a fingerprint sensor. The sensor may be connected to a controller including a fingerprint identification circuit in addition to the oximeter circuit and other physiological circuitries such as ECG, pulse or heart rate, NIBP (Non-Invasive Blood Pressure) and temperature. A display may provide an indication of the measured blood oxygen saturation level along with identification information. The display may be located to provide remote monitoring of oxygen saturation and fingerprint identification of the patient, for example, at a central station. The fingerprint identification circuit may be activated individually to obtain the patient fingerprint, which may be recorded in a memory, either in the controller or a remote memory store, or both.02-12-2009
20080208019Modified Pulse Oximetry Technique For Measurement Of Oxygen Saturation In Arterial And Venous Blood - A method for the measurement of oxygen saturation in arterial blood SaO08-28-2008
20110105869Sensor for Internal Monitoring of Tissue O2 and/or pH/CO2 In Vivo - Provided is a durable tissue pH/pCO05-05-2011
20090043179Processing of Photoplethysmography Signals - Disclosed herein are methods and devices of processing photoplethysmography signal information. The methods for processing will allow numerous medical observations and diagnoses from a simple, non-invasive probe.02-12-2009
20110282168Health monitoring device and methods thereof - A health monitoring system includes a client device having one or more sensors to take medical or environmental measurements. The client device can interact with a server device to guide the user through the use of a sensor. The state of the sensors is controlled at the server to provide for flexibility of the health monitoring system.11-17-2011
20120289800TISSUE CLAMP FOR NONINVASIVE PHYSIOLOGICAL MEASUREMENT - A device includes a clamp and a sensor. The sensor can be attached to the clamp and tissue by the force exerted by the damp. The clamp includes a first jaw member having a jaw face and a second jaw member having a complementary face. The first and second jaw members are held in alignment by a joint. The joint has an elastic member configured to exert a compressive force. The joint allows movement of the jaw face relative to the complementary face in directions corresponding to pitch, roll, yaw, and heave. The compressive force is distributed over a surface of the jaw face. The sensor is coupled to the jaw face or held in place by the compressive force of the jaw face. The sensor is configured to generate a sensor signal corresponding to a physiological parameter of tissue proximate the jaw face.11-15-2012
20100185067NONINVASIVE DETECTION OF ELEMENTS AND/OR CHEMICALS IN BIOLOGICAL MATTER - A method of detecting oxygen and/or chemical content in a subject, comprising generating at least one spectral image of the subject; generating at least one spectral image of a reference object; comparing spectrum from the subject image to the reference image to thereby reveal the relative oxygen content of the subject. A system for determining the level of oxygenation of the blood of a subject body part comprising: a hyperspectral image generator for generating a plurality of spectral images; an image capture device for capturing the spectral images; a processor for generating hyperspectral image cubes such that the spectrum of the body part is extracted and normalized using the spectrum from the reference object to cancel out the spectral response of the light source and the imager; said processor comparing spectral from a subject image to reference images to thereby reveal the relative oxygen content of the subject.07-22-2010
20110295093Retinopathy Of Prematurity Determination And Alarm System - Embodiments of the present disclosure relate to determining a likelihood of possible retinopathy of prematurity and alerting a caregiver of such likelihood. According to certain embodiments, an apparatus for determining a risk of retinopathy of prematurity in a patient may include a processing unit. The processing unit is configured to determine whether an oxygen saturation level of the patient extends beyond an oxygen saturation threshold, determine an extent that the oxygen saturation level of the patient extends beyond the oxygen saturation threshold, and trigger an alarm when the extent that the oxygen saturation level of the patient extends beyond the oxygen saturation threshold exceeds a threshold at which the patient may be at risk of developing retinopathy of prematurity. The apparatus may also include a display unit configured to present the alarm in response to the trigger from the processing unit.12-01-2011
20100249551System And Method For Generating Corrective Actions Correlated To Medical Sensor Errors - A system and method for determining physiological parameters of a patient as well as errors based on light transmitted through the patient. Based on the received light, a most likely type of error may be determined, as well as one or more most likely actions to be undertaken to correct the error. Both the error and the corrective actions to be undertaken may be displayed.09-30-2010
20100249550Method And Apparatus For Optical Filtering Of A Broadband Emitter In A Medical Sensor - A system and method for determining physiological parameters of a patient based on light transmitted through the patient. The light may be transmitted via a broadband light source and received by a detector The light may also be optically filtered by an optical filter of either the light source or the detector. Based on the filter, specific wavelengths of light are received by the detector for use in monitoring the physiological parameters of the patient.09-30-2010
20100249549Indicating The Accuracy Of A Physiological Parameter - This disclosure describes systems and methods for displaying information that describes the accuracy of estimated values of physiological parameters. As part of the process of estimating a physiological parameter, the data used for the estimation are further analyzed to determine one or more statistical parameters indicative of the accuracy of the estimate. These statistical parameters are then displayed to the caregiver in order to provide the caregiver additional information concerning the estimated value. In the systems and methods described herein, one or more probability analyses are performed on the data used to generate the estimate of the physiological parameter. The analyses may include calculating the accuracy, confidence interval or some other statistical parameter representative of the accuracy of the estimate of the physiological parameter from the variations in the data An indication of the accuracy and/or an indication of the calculated probability may then be displayed to a caregiver or user.09-30-2010
20090187086Integrated White LED Illuminator and Color Sensor Detector System and Method - An improved illuminator (07-23-2009
20100036218 FINGERTIP BLOOD OXYGEN SATURATION MEASURING APPARATUS - A blood oxygen saturation measuring apparatus comprising an upper shell, a lower shell, and an elastic restoring structure, characterized in that a mark is arranged on a lateral side surface of the upper and/or the lower shell; and the mark is provided to be in alignment with the vertical position of a photoelectric sensing chip which is arranged inside the shell. According to the present invention, the humanized mark is adopted, which can observe the measured position of the measured finger. Even if in the case of weak light environment or a lazy eye user, the accurate and reliable blood oxygen saturation data can be acquired.02-11-2010
20090099429SINE SATURATION TRANSFORM - A transform for determining a physiological measurement is disclosed. The transform determines a basis function index from a physiological signal obtained through a physiological sensor. A basis function waveform is generated based on basis function index. The basis function waveform is then used to determine an optimized basis function waveform. The optimized basis function waveform is used to calculate a physiological measurement.04-16-2009
20100113902Small Bore Magnetic Resonance Imaging Photoplethysmographic Sensor - An efficient, effective, MRI compatible small bore MRI noninvasive photoplethysmographic sensor for animals such as small rodents, namely rats and mice. The photoplethysmographic sensor for animals comprising: a non-magnetic sensor coupling attachable to an animal; fiber optic cable coupled to the sensor coupling and configured to deliver a signal to and receive a signal from the animal tissue adjacent the sensor coupling; an opto-electical converter coupled to the fiber optic cable, the converter including a receiver coupled the fiber optic cable portion configured to receive a signal from the animal tissue and including an emitter coupled to the fiber optic portion configured to deliver a signal to the animal tissue; an electronic coupling extending from the opto-electric converter and configured to be coupled to the emitter and the receiver, wherein the electronic coupling is configured to extend outside of the MRI chamber; and a processor coupled to the electronic coupling.05-06-2010
20100113903PULSE OXIMETER SENSOR WITH PIECE-WISE FUNCTION - A memory in a sensor is used to store multiple coefficients for a physiological parameter. In one embodiment, not only are the sensor's specific calibration coefficients stored in a memory in the sensor for the formula to determine oxygen saturation, but multiple sets of coefficients are stored. The multiple sets apply to different ranges of saturation values to provide a better fit to occur by breaking the R to SpO2 relationship up into different pieces, each described by a different function. The different functions can also be according to different formulas for determining oxygen saturation.05-06-2010
20120108927METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING - A method and apparatus for non-invasively determining the blood oxygenation within a subject's tissue is provided that utilizes a near infrared spectrophotometric (NIRS) sensor capable of transmitting a light signal into the tissue of a subject and sensing the light signal once it has passed through the tissue via transmittance or reflectance.05-03-2012
20120108926DEVICES, SYSTEMS, AND METHODS FOR TRANSRADIAL ACCESS - Devices, systems, and methods for transradial access. In at least one embodiment of a device for providing access to a vessel or other luminal organ of the present disclosure, the device comprises a needle having a needle tip, a sheath positioned around at least part of the needle, the sheath defining an aperture at a distal sheath end, and a protractor in communication with the needle, whereby engagement of the protractor causes the needle tip to protract from the sheath, and whereby release of the protractor causes the needle tip to retract into the sheath.05-03-2012
20120108925MONITORING OF TISSUE HEMOGLOBIN CONCENTRATION - A medical device system and associated method monitor tissue hemoglobin concentration. Light attenuation is measured in a volume of tissue in a patient. A value of a tissue scattering coefficient corresponding to the tissue volume in the patient is established in response to the attenuation measurement. A second derivative of the light attenuation measurement is determined. An artifact correction term is computed in response to the established tissue scattering coefficient, and a tissue hemoglobin concentration is computed using the artifact correction term and the second derivative.05-03-2012
20100099964HEMOGLOBIN MONITOR - A patient monitor system is configured to measure and display a hemoglobin concentration measurement to assist caregivers in providing care or treatment and/or to automatically control a fluid, blood, medicine, or dialysis administration system. The patient monitor can analyze the displayed hemoglobin concentration measurement and provide alarms and feedback to assist caregivers. Additional measurement can be combined with the hemoglobin concentration measurement to provide combined displays helpful to caregivers, such as, for example, a plethysmograph variability index v. SpHb display.04-22-2010
20100099963PERIPHERAL OXISTIMULATOR APPARATUS AND METHODS - Apparatus and methods for monitoring a patient's blood oxygen content (through, e.g., an external finger probe using a pulse oximeter). If the patient's blood oxygen content falls below a selected level, a safe, yet effective, level of peripheral nerve stimulation would be delivered to the patient's wrist in the form of a milliamp current to arouse the patient.04-22-2010
20100099962SENSING DEVICE AND POSITIONING STRUCTURE THEREOF - A sensing device for sensing blood of a finger includes a base, a transceiver, a first positioning element and a second positioning element. The base includes a first half portion and a second half portion. The transceiver includes a first transmission element disposed on the first half portion, a second transmission element disposed on the second half portion, and a signal transmitted from one of the first and second transmission elements to the other. The first and second positioning elements are respectively disposed on the first and second half portions. The second positioning element is detachably engaged to the first positioning element. When the finger is disposed between the first and second half portions and the first and second positioning elements are engaged, the finger is located between the first and second transmission elements, and signals transmitted between the first and second transmission elements passes through blood of the finger.04-22-2010
20100087718NON-INTERFERING PHYSIOLOGICAL SENSOR SYSTEM - A system includes a light source, a photodetector in optical communication with the light source, and a processor in communication with said photodetector and configured to output a signal representing oxygen saturation independent of an interfering signal from an interfering source. The system may further include an analog-to-digital converter in communication with the processor that is configured to digitize a signal from the photodetector by oversampling and output oversampling data to the processor. The processor may include an averaging filter that averages the oversampling data received from said analog-to-digital converter prior to decimation to generate an oversampling number.04-08-2010
20090005662Oximeter Ambient Light Cancellation - A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.01-01-2009
20090177053Coaxial LED Light Sources - An emitter device may include at least two emitters, such as LEDs. The coaxially disposed emitters may emit light in substantially the same area so that no apparent distance is perceived between individual emitters, as in emitter devices in which the emitters are disposed adjacent one another. The coaxially disposed emitters may include emitters suitable for pulse oximetry and/or water fraction measurements, for example.07-09-2009
20100210930Physiological Blood Gas Detection Apparatus and Method - The present disclosure is directed to methods and physiological sensing devices for determining blood gas concentrations in a human or animal subject. Such devices may further detect and measure the subject's heart rate.08-19-2010
20090112074METHOD FOR MEASURING BLOOD OXYGEN CONTENT UNDER LOW PERFUSION - A method for measuring blood oxygen content under low perfusion, which is used in a device for measuring blood oxygen content, includes the steps of: initializing the device that is applied with power, collecting and processing data with a driving circuit of light emitting device, a bias circuit, a gain circuit and an A/D sampling circuit, which are controlled under a cone control module; calculating blood oxygen saturation based on the collected data with a data processing module which integrates the collected data in a period of time with an area integration method; and outputting from a communication functional module results of the blood oxygen saturation or pulse rate calculated with the data processing module. The method further includes a decision step of deciding the two results acquired from the data processing module with the waveform method and the integration method respectively based on the intensity of the measured signal and generating the final measured result, performed by a decision unit included in the device. By adopting the above method, the disturbance to effective signal by noise can be eliminated. As a result, the measuring accuracy of blood oxygen content under low perfusion can be improved without increasing the production cost for the measuring device.04-30-2009
20120296181SYSTEM AND METHOD FOR VOICE CONTROL OF MEDICAL DEVICES - A medical device includes an insertable portion capable of being inserted into an orifice associated with a body of a patient. The insertable portion comprising an automated head unit capable of being manipulated in at least two axes of motion based at least in part on one or more control signals. The medical device further includes one or more controllers coupled to the automated head unit. In one particular embodiment, the one or more controllers generate the one or more control signals based at least in part on an input signal.11-22-2012
20080275321OPTICAL SENSOR APPARATUS AND METHOD OF USING SAME - An apparatus for, and method of, sensing characteristics of a vessel and a fluid conveyed therein.11-06-2008
20110208025CYANOTIC INFANT SENSOR - A pulse oximetry sensor comprises emitters configured to transmit light having a plurality of wavelengths into a fleshy medium. A detector is responsive to the emitted light after absorption by constituents of pulsatile blood flowing within the medium so as to generate intensity signals. A sensor head has a light absorbing surface adapted to be disposed proximate the medium. The emitters and the detector are disposed proximate the sensor head. A detector window is defined by the sensor head and configured so as to limit the field-of-view of the detector.08-25-2011
20080287756Pulse oximetry relational alarm system for early recognition of instability and catastrophic occurrences - A relational pulse oximetry alarm system and method is presented for earlier identification of the occurrence of an adverse clinical event. The system includes a pulse oximeter based microprocessor alarm system which provides an alarm based on a relational conformation of a plurality of time series and further based on the recognition of specific dynamic patterns of interaction between a plurality of corresponding and related time series including the occurrence of pathophysiologic divergence of two or more time series outputs. The processor is programmed to compare a first time series to a second time series to produce a comparison result, to identify a relationship between the first time series and the second time series, to identify a relational threshold breach, and to output an alarm based on the relational threshold breach. The system can include an oximeter testing system for predicting the timeliness of the response of the alarm of a pulse oximeter to the occurrence of an adverse clinical event.11-20-2008
20120296182METHOD AND APPARATUS FOR MONITORING SLEEP APNEA SEVERITY - Disclosed embodiments include a method and an apparatus for monitoring sleep apnea severity that comprise: (a) analyzing an oxygen saturation signal to extract a plurality of time-domain and frequency-domain metrics; (b) calculating an oxygen saturation-based Apnea Hyponea Index (AHI) by employing a predetermined functional mapping between said metrics and polysomnography (PSG)-based AHI; and (c) displaying an oxygen saturation-based AHI to enable a specialist to monitor sleep apnea severity without requiring PSG. According to a particular embodiment, the oxygen saturation signal is nocturnal oxygen saturation and the functional mapping is a multilinear regression model (MLR) or a multilayer perceptron network (MLP).11-22-2012
20080242960Spatially Resolved Oxymetry - In optical tomography, a calibration of the data may be necessary for image reconstruction. According to an exemplary embodiment of the present invention, the object of interest is used for calibration, wherein the image data is acquired during a highly oxygenated phase of the object of interest and wherein the calibration data is acquired during a low oxygenated phase of the object of interest. This may provide for an improved calibration, resulting in improved image quality.10-02-2008
20110208024SYSTEM AND METHOD OF RESOLVING OUTLIERS IN NIRS CEREBRAL OXIMETRY - A system and method for non-invasively estimating the tissue blood oxygen saturation level of a human subject, including so-called “outliers”, whose physiological make-up causes previously-known techniques to generate invalid tissue blood oxygen saturation estimations. The system includes a computing device and a sensor. The sensor includes a light source configured to emit light of at least four different wavelengths, one at a time. The sensor also includes two light detectors, each positioned a different distances from the light source. Optical density measurements are taken by the light detectors and provided to the computing device. A first tissue blood oxygen saturation value is computed using the optical density measurements associated with three of the four wavelengths, and a second tissue blood oxygen saturation value is computed using the optical density measurements associated with four of the wavelengths. The first and second tissue blood oxygen saturation values are compared, and the human subject is identified as an “outlier” based upon that comparison.08-25-2011
20080269579System for Monitoring Changes in an Environmental Condition of a Wearer of a Removable Apparatus - A system for detecting at least one of an environmental condition and a physical condition of a user, the system including a removable apparatus that may be placed in contact with the user when a change in at least one environmental condition is expected, a probe as part of the removable apparatus for detecting the change in the at least one environmental condition, a power source as part of the removable apparatus for powering the probe, a monitoring unit, and a communication system for communicating between the removable apparatus and the remote monitoring unit.10-30-2008
20090259115SYSTEMS AND METHODS FOR DETERMINING BLOOD OXYGEN SATURATIONS VALUES USING COMPLEX NUMBER ENCODING - The disclosure includes pulse oximetry systems and methods for determining point-by-point saturation values by encoding photoplethysmographs in the complex domain and processing the complex signals. The systems filter motion artifacts and other noise using a variety of techniques, including statistical analysis such as correlation, or phase filtering.10-15-2009
20090326346OPTICAL PERFUSION SENSOR DETECTOR - A reflectance optical perfusion sensor may include at least one light source and a plurality of detector elements arranged in a planar or nonplanar configuration, such as a three-dimensional array. The detector elements may sense light emitted by the at least one light source and reflected by a blood mass of a patient, such as blood within a blood vessel. In some examples, the detector elements may be arranged such that photodetection surfaces of at least two of the detector elements are nonparallel. In addition to or instead of the nonplanar arrangement of detector elements, an optical perfusion sensor may include a detector array including a plurality of detector elements at least partially surrounding a light source. Varying the location and orientations of detector elements may help increase a quantity of light emitted by the at least one light source and reflected toward the optical perfusion sensor by blood.12-31-2009
20090326349Consistent Signal Selection By Signal Segment Selection Techniques - According to embodiments, techniques for selecting a consistent part of a signal, including a photoplethysmograph (PPG) signal, are disclosed. A pulse oximetry system including a sensor or probe may be used to obtain a PPG signal from a subject. Signal peaks may be identified in the PPG signal. Characteristics of the signal peaks, including the amplitude levels of the signal peaks and/or the time-distance between the signal peaks may be used to determine if the PPG signal is consistent. In an embodiment, signal peaks are processed based on a consistency metric, and the processed signal peaks are compared to the consistency metric to determine if the PPG signal is consistent. If the PPG signal is determined to be consistent, the PPG signal may be further analyzed to determine an underlying signal parameter, including, for example, a patient respiration rate. If the PPG signal is determined to be inconsistent, the inconsistent portion of the signal may be removed from the overall signal or otherwise transformed.12-31-2009
20090326348METHOD FOR IMPROVED OXYGEN SATURATION ESTIMATION IN THE PRESENCE OF NOISE - The present disclosure relates, according to some embodiments, to devices, systems, and methods for estimating a physiological parameter in the presence of noise. For example, the disclosure relates, in some embodiments, to devices, systems, and methods for assessing (erg., estimating, measuring, calculating) oxygen saturation (SpO12-31-2009
20090326345RESULT VALIDATION IN NON-INVASIVE CEREBRAL OXYGENATION LEVEL MONITORING - Methods, systems, and related computer program products for optically monitoring a chromophore level in a body part of a patient are described. An optical source introduces optical radiation into the body part, and an optical detector receives optical radiation that has propagated through at least a portion of the body part and produces a first signal representative of the received optical radiation. The first signal is processed to produce a chromophore level metric, which is output on a user display, and is further processed to produce a second signal known to exhibit measurably significant timewise fluctuations corresponding to at least one intrinsic physiological oscillation of the patient when the optical source and the optical detector are in proper optical coupling with the body part. An error condition indication is provided if the measurably significant timewise fluctuations are not present in the second signal.12-31-2009
20090209835SIGNAL PROCESSING APPARATUS AND METHOD - A method and an apparatus to analyze two measured signals that are modeled as containing desired and undesired portions such as noise, FM and AM modulation. Coefficients relate the two signals according to a model defined in accordance with the present invention. In one embodiment, a transformation is used to evaluate a ratio of the two measured signals in order to find appropriate coefficients. The measured signals are then fed into a signal scrubber which uses the coefficients to remove the unwanted portions. The signal scrubbing is performed in either the time domain or in the frequency domain. The method and apparatus are particularly advantageous to blood oximetry and pulserate measurements. In another embodiment, an estimate of the pulserate is obtained by applying a set of rules to a spectral transform of the scrubbed signal. In another embodiment, an estimate of the pulserate is obtained by transforming the scrubbed signal from a first spectral domain into a second spectral domain. The pulserate is found by identifying the largest spectral peak in the second spectral domain.08-20-2009
20110224518HANDHELD APPARATUS TO DETERMINE THE VIABILITY OF A BIOLOGICAL TISSUE - The present invention provides for a handheld apparatus for in vivo examination of the viability of a biological tissue.09-15-2011
20090024011NON-INVASIVE DETERMINATION OF THE CONCENTRATION OF A BLOOD SUBSTANCE - In order to provide a non-invasive and continuous concentration measurement with the technology of standard pulse oximeters, an a priori relationship is created, through an in-vivo tissue model including a nominal estimate of a tissue parameter indicative of the concentration of a blood substance. The a priori relationship is indicative of the effect of tissue on in-vivo measurement signals at a plurality of wavelengths, the in-vivo measurement signals being indicative of absorption caused by pulsed arterial blood. In-vivo measurement signals are acquired from in-vivo tissue at the plurality of wavelengths and a specific value of the tissue parameter is determined based on the a priori relationship, the specific value being such that it yields the effect of the in-vivo tissue on the in-vivo measurement signals consistent for the plurality of wavelengths. The specific value then represents the concentration of the substance in the blood.01-22-2009
20090024012METHOD AND APPARATUS FOR MEASURING BLOOD OXYGEN SATURATION - A method and apparatus are disclosed for measuring blood oxygen saturation by using spectrophotometry to improve the accuracy of the measurement under a condition of low perfusion.01-22-2009
20080306366BIOLOGICAL-INFORMATION OBTAINING APPARATUS AND METHOD THEREOF - A biological-information obtaining apparatus includes a light-emitting unit configured to emit light, an image-capturing unit configured to capture images, in time sequence, obtained by irradiating a living body with the light emitted and by causing the light to be transmitted through or reflected by the living body, the image-capturing unit being sensitive to at least two color components, an extreme generation unit configure to generate, for each of the captured images in the time sequence, a maximum value and a minimum value of each of the color components in a certain area of the captured image, and an oxygen-saturation calculation unit configured to calculate oxygen saturation on the basis of the maximum value and the minimum value of each of the color components in the certain area of the captured image.12-11-2008
20090198114APPARATUS AND METHOD FOR ELUCIDATING REACTION DYNAMICS OF PHOTOREACTIVE COMPOUNDS FROM OPTICAL SIGNALS AFFECTED BY AN EXTERNAL MAGNETIC FIELD - An apparatus and method for elucidating reaction dynamics of photoreactive compounds from time-resolved optical signals affected by an external magnetic field. The apparatus includes a coil or magnet for applying a magnetic field at a region of interest (ROI). The apparatus further includes a light or laser for illuminating the ROI with a probe beam. An optical fiber collects light emitted by the probe beam; and a computer analyses the collected light.08-06-2009
20100198028Soft Gum Fingerstall Oximeter Without Pivot Structure - The present invention discloses a soft gum fingerstall oximeter without pivot structure, the soft gum fingerstall oximeter comprises a soft gum fingerstall which can wraps around a finger closely with variations of the profile of the finger and causes a clamping force distributed on the clamped portion of the finger uniformly. An emission circuit board and a reception circuit board are provided in the soft gum fingerstall. The soft gum fingerstall of the oximeter is enclosed, which can shield light entering from a side.08-05-2010
20090099430SIGNAL PROCESSING APPARATUS - A signal processor which acquires a first signal, including a first primary signal portion and a first secondary signal portion, and a second signal, including a second primary signal portion and a second secondary signal portion, wherein the first and second primary signal portions are correlated. The signals may be acquired by propagating energy through a medium and measuring an attenuated signal after transmission or reflection. Alternatively, the signals may be acquired by measuring energy generated by the medium. A processor of the present invention generates a primary or secondary reference signal which is a combination, respectively, of only the primary or secondary signal portions. The secondary reference signal is then used to remove the secondary portion of each of the first and second measured signals via a correlation canceler, such as an adaptive noise canceler, preferably of the joint process estimator type. The primary reference signal is used to remove the primary portion of each of the first and second measured signals via a correlation canceler. The processor of the present invention may be employed in conjunction with a correlation canceler in physiological monitors wherein the known properties of energy attenuation through a medium are used to determine physiological characteristics of the medium. Many physiological conditions, such as the pulse, or blood pressure of a patient or the concentration of a constituent in a medium, can be determined from the primary or secondary portions of the signal after other signal portion is removed.04-16-2009
20080262326Signal Processing Method and Apparatus for Processing a Physiologic Signal such as a Photoplethysmography Signal - A signal processing method of processing a physiologic signal, such as a Photoplethysmography Signal having at least some cardiac components and/or respirator components in the physiologic signal, the processing including the steps of: Identifying a potential cardiac and or respiratory components of a physiologic signal wherein the potential cardiac and or respiratory components have a series of peaks and valleys; Calculating a comparison of the durations of a peak to valley sub-component and a valley to peak sub component of the potential cardiac and or respiratory components; and Utilizing the calculated comparison to evaluate the potential cardiac and or respiratory components.10-23-2008
20090247846PULSE OXIMETER WITH REDUCED CROSS TALK EFFECTS - A method of reducing the effect of cross talk in a pulse oximeter is disclosed herein. The method includes: setting an initial pulse width and pulse rate for an LED drive signal and measuring a cross talk generated within the pulse oximeter. Based on the measured cross talk, the pulse width of the LED drive signal is minimized. The pulse width is minimized based on a relationship between the cross talk and a threshold level.10-01-2009
20090247847SYSTEMS AND METHODS FOR TOMOGRAPHIC IMAGE RECONSTRUCTION - Optical tomography systems that provide light of multiple distinct wavelengths from a plurality of sources are described. The systems direct light into mammalian tissue, and light from the mammalian tissue is collected at a plurality of reception points. Collected light from each reception point is separated according to its wavelength, and received by a photodetector to produce path attenuation signals representing attenuation along paths between the source locations and the reception points. An image construction system generates a tomographic image of the mammalian tissue from the path attenuation signals. One embodiment of an optical imaging system includes an optical coherence tomography-near infrared probe. The systems and methods may utilize a spectral derivative approach that provides insensitivity to the boundary and boundary artifacts in the signal, thereby improving the quality of the reconstructed images.10-01-2009
20090253971ADJUSTING PARAMETERS USED IN PULSE OXIMETRY ANALYSIS - Adjusting a pulse qualification criterion includes receiving a signal representing a plurality of pulses, where the signal is generated in response to detecting light scattered from blood perfused tissue. A characteristic is determined. A pulse qualification criterion used for qualifying a pulse is adjusted in accordance with the characteristic. The pulses are evaluated according to the pulse qualification criterion.10-08-2009
20100174160Detection, imaging and characterization of brain tissue - An optical examination technique employs an optical system for in vivo non-invasive transcranial examination of brain tissue of a subject. The optical system includes an optical module arranged for placement on the exterior of the head, a controller and a processor. The optical module includes an array of optical input ports and optical detection ports located in a selected geometrical pattern to provide a multiplicity of photon migration paths inside the biological tissue. Each optical input port is constructed to introduce into the examined tissue visible or infrared light emitted from a light source. Each optical detection port is constructed to provide light from the tissue to a light detector. The controller is constructed and arranged to activate one or several light sources and light detectors so that the light detector detects light that has migrated over at least one of the photon migration paths. The processor receives signals corresponding to the detected light and forms at least two data sets, a first of said data sets representing blood volume in the examined tissue region and a second of said data sets representing blood oxygenation of the examined tissue. The processor is arranged to correlate the first and second data sets to detect abnormal tissue in the examined tissue.07-08-2010
20100160752Detection, imaging and characterization of breast tumors - An optical system for in vivo non-invasive examination of breast tissue of a subject includes an optical module, a controller and a processor. The optical module includes an array of optical input ports and optical detection ports located in a selected geometrical pattern to provide a multiplicity of source-detector paths of photon migration inside the breast tissue. Each optical input port is constructed to introduce into the tissue volume visible or infrared light emitted from a light source. Each optical detection port is constructed to provide light from the tissue to a light detector. The controller is constructed and arranged to activate one or several light sources and light detectors so that the light detector detects light that has migrated over at least one of the source-detector migration paths. The processor receives signals corresponding to the detected light and creates a defined spatial image of the examined tissue.06-24-2010
20100191081QUANTITATIVE THREE-DIMENSIONAL MAPPING OF OXYGEN TENSION - Methods and apparatus are disclosed for measuring and mapping oxygen tension in a tissue and, in particular, permit direct non-invasive measurement of retinal tissue oxygen tension. In one aspect, the invention is directed to methods for determining oxygen tension in a target tissue sensitized with an oxygen sensitive probe by imaging the target tissue. In one embodiment, the invention provides a noninvasive method for monitoring oxygen tension in a chorioretinal tissue sensitized with an oxygen sensitive probe. In another aspect, apparatus is disclosed that can determine oxygen tension in tissue by quantifying a signal emitted by an oxygen sensitive probe within the three-dimensional map of a tissue to determine oxygen tension and provide a three-dimensional map of oxygen tension variations.07-29-2010
20110060200IN VIVO BLOOD SPECTROMETRY - A process and apparatus for determining the arterial and venous oxygenation of blood in vivo with improved precision. The optical properties of tissue are measured by determination of differential and total attenuations of light at a set of wavelengths. By choosing distinct wavelengths and using the measured attenuations, the influence of variables such as light scattering, absorption and other optical tissue properties is canceled out or minimized.03-10-2011
20080208020IMPLANTABLE TISSUE PERFUSION SENSING SYSTEM AND METHOD - A medical device for sensing cardiac events that includes a plurality of light sources capable of emitting light at a plurality of wavelengths, and a detector to detect the emitted light. A processor determines a plurality of light measurements in response to the emitted light detected by the detector, updates, for each of the plurality of wavelengths, a first normalization coefficient and a second normalization coefficient in response to the detected emitted light, and adjusts the determined plurality of light measurements in response to the first normalization coefficient and the second normalization coefficient.08-28-2008
20100130841NONINVASIVE LIVING BODY MEASUREMENT APPARATUS AND NONINVASIVE LIVING BODY MEASUREMENT METHOD - An easily wearable noninvasive living body measurement apparatus is provided. The noninvasive living body measurement apparatus (05-27-2010
20100217104SYSTEM AND METHOD FOR DISPLAY CONTROL OF PATIENT MONITOR - Embodiments of the present invention relate to monitoring systems. One embodiment includes a monitoring system comprising a monitor configured to receive input relating to patient physiological parameters and to store historical data related to the parameters. Further, the system comprises a screen configured to display the historical data corresponding to the patient physiological parameters, and a display control feature configured to automatically find and display an event in the historical data on the screen when the display control feature is activated.08-26-2010
20100240971INTEGRATED MULTIMODALITY BRAIN MONITORING DEVICE - A device for monitoring brain parameters in a patient includes at least one central nervous system function sensor, at least one brain oxygen sensor, at least one blood flow velocity sensor, a video monitor and a computational circuit. The nervous system function sensor is configured to sense a nervous system function of the patient. The brain oxygen sensor is configured to sense a brain oxygen concentration of the patient. The brain blood flow velocity sensor is configured to sense the blood flow velocity of the patient. The computational circuit is in data communication with the nervous system function sensor and the brain oxygen sensor. The computational circuit is configured to generate a graphic representation, for display on the video monitor, of the nervous system function of the patient and the brain oxygen concentration of the patient.09-23-2010
20100317944Rocker-Chute Type Finger-Clipped Oximeter - The present invention discloses a finger-clipped oximeter comprising an upper case (12-16-2010
20100210928PULSE OXIMETER WITH CHANGEABLE STRUCTURE - A pulse oximeter with changeable structure includes a first housing, having a light emitting element and a light receiving element mounted therein, and a second housing, electrically connected to the first housing, wherein the circuit needed by the pulse oximeter is distributed into the first and the second housings, and a corresponding pair of assembling mechanisms are further mounted on the first and the second housings, respectively, so that the first and the second housings are capable of being assembled together to form one single combination.08-19-2010
20110028810Systems And Methods For Resolving The Continuous Wavelet Transform Of A Signal - According to an embodiment, techniques for estimating scalogram energy values in a wedge region of a scalogram are disclosed. A pulse oximetry system including a sensor or probe may be used to receive a photoplethysmograph (PPG) signal from a patient or subject. A scalogram, corresponding to the obtained PPG signal, may be determined. In an approach, energy values in the wedge region of the scalogram may be estimated by performing convolution-based or convolution-like operations on the obtained PPG signal, or a transformed version thereof, and the scalogram may be updated according to the estimated values. In an approach, a deskewing technique may be used to align data prior to adding the data to the scalogram. In an approach, one or more signal parameters may be determined based on the resolved and estimated values of the scalogram.02-03-2011
20110028811NON-INVASIVE PHYSIOLOGICAL SENSOR COVER - A sensor cover according to embodiments of the disclosure is capable of being used with a non-invasive physiological sensor, such as a pulse oximetry sensor. Certain embodiments of the sensor cover reduce or eliminate false readings from the sensor when the sensor is not in use, for example, by blocking a light detecting component of a pulse oximeter sensor when the pulse oximeter sensor is active but not in use. Further, embodiments of the sensor cover can prevent damage to the sensor. Additionally, embodiments of the sensor cover prevent contamination of the sensor.02-03-2011
20120143025METHOD AND CIRCUIT FOR INDICATING QUALITY AND ACCURACY OF PHYSIOLOGICAL MEASUREMENTS - Sensors and monitors for a physiological monitoring system having capability to indicate an accuracy of an estimated physiological condition. The sensor senses at least one physiological characteristic of a patient and is connectable to a monitor that estimates the physiological condition from signals detected by the sensor. The sensor includes a detector for detecting the signals from the patient which are indicative of the physiological characteristic. The sensor is associated with a memory configured to store data that defines at least one sensor signal specification boundary for the detected signals. The boundary is indicative of a quality of the signals and an accuracy of the physiological characteristic estimated from the signals by the monitor. The sensor further includes means for providing access to the memory to allow transmission of the data that defines the at least one sensor boundary to the monitor.06-07-2012
20100174161SYSTEM AND METHOD FOR THE DETECTION OF PHYSIOLOGIC RESPONSE TO STIMULATION - The disclosed embodiments relate to a system and method for detecting a response of a patient to an external stimulus. An exemplary method comprises the acts of generating at least one time series of at least one physiologic parameter, detecting the external stimulus, detecting at least one response associated with the stimulus, the response comprising at least one of a pattern and a value, and outputting an indication of the response.07-08-2010
20090247848Reducing Nuisance Alarms - Embodiments disclosed herein may describe systems and methods for reducing nuisance alarms using probability and/or accuracy of a measured physiological parameter, such as the pulse rate or SpO2 measurement generated by a pulse oximeter. Embodiments may include methods for adjusting a predetermined alarm threshold based on the probability distribution of the estimated pulse rate and/or oxygen saturation of a patient's blood.10-01-2009
20090149727Noninvasive Photoplethysmographic Sensor Platform for Mobile Animals - A noninvasive photoplethysmographic sensor platform for mobile animals such as small rodents, namely rats and mice is useful such as in a laboratory research environment. The noninvasive photoplethysmographic sensor platform may be a collar which provides an easily affixed, adjustable attachment mechanism that encircles the animal, such as the neck. The neck of the animal provides several particular advantages as a sensor mounting platform for photoplethysmographic sensors. For pulse oximetry, the neck location will provide significant blood flow under all conditions. For small mammals, such as rats and mice, transmittance pulse oximetry through the neck of the subject remains possible. The neck mounted collar also offers inherent bite resistance to the sensor platform.06-11-2009
20090143655Apparatus, System and Method for Determining Cardio-Respiratory State - An apparatus, system and method provide data indicative of cardio-respiratory state of a patient. Two or more cardio-respiratory parameters of the patient are measured, and optionally monitored over time, the two or more cardio-respiratory parameters being different one from the other and being measured at a same anatomical part of said patient.06-04-2009
20090105567Wireless telecommunications network adaptable for patient monitoring - A wireless network having an architecture that resembles a peer-to-peer network has two types of nodes, a first sender type node and a second receiver/relay type node. The network may be used in a medical instrumentation environment whereby the first type node may be wireless devices that could monitor physical parameters of a patient such as for example wireless oximeters. The second type node are mobile wireless communicators that are adapted to receive the data from the wireless devices if they are within the transmission range of the wireless devices. After an aggregation process involving the received data, each of the node communicators broadcasts or disseminates its most up to date data onto the network. Any other relay communicator node in the network that is within the broadcast range of a broadcasting communicator node would receive the up to date data. This makes it possible for communicators that are out of the transmitting range of a wireless device to be apprized of the condition of the patient being monitored by the wireless device. Each communicator in the network is capable of receiving and displaying data from a plurality of wireless devices.04-23-2009
20090105566Method for establishing a telecommunications system for patient monitoring - A wireless network having an architecture that resembles a peer-to-peer network has two types of nodes, a first sender type node and a second receiver/relay type node. The network may be used in a medical instrumentation environment whereby the first type node may be wireless devices that could monitor physical parameters of a patient such as for example wireless oximeters. The second type node are mobile wireless communicators that are adapted to receive the data from the wireless devices if they are within the transmission range of the wireless devices. After an aggregation process involving the received data, each of the node communicators broadcasts or disseminates its most up to date data onto the network. Any other relay communicator node in the network that is within the broadcast range of a broadcasting communicator node would receive the up to date data. This makes it possible for communicators that are out of the transmitting range of a wireless device to be apprized of the condition of the patient being monitored by the wireless device. Each communicator in the network is capable of receiving and displaying data from a plurality of wireless devices.04-23-2009
20090069652Method and Apparatus for Sensing Blood Oxygen - An exemplary embodiment providing one or more improvements includes a blood oxygen sensing apparatus and method in which an infra-red light is absorbed blood in portions that are related to levels of oxygen in the blood along a path.03-12-2009
20130137945Pulse Rate Determination Using Gaussian Kernel Smoothing of Multiple Inter-Fiducial Pulse Periods - Systems and methods are provided for determining the pulse rate of a patient from multiple fiducial points using Gaussian kernel smoothing. Based on acquired pleth signals, each recorded fiducial pulse period is converted to a Gaussian kernel function. The Gaussian kernel functions for all recorded fiducial points are summed to generate a Gaussian kernel smoothed curve. The pulse rate of a patient may be determined from the Gaussian kernel smoothed curve. All acquired fiducial pulse periods contribute to generate the Gaussian kernel smoothing curve. The number of fiducial points utilized may change to improve pulse rate determination or provide additional functionality to the system.05-30-2013
20100317941ABSOLUTE CALIBRATED TISSUE OXYGEN SATURATION AND TOTAL HEMOGLOBIN VOLUME FRACTION - A medical device for monitoring a patient condition includes a first combination of a light source and a light detector to emit light into a volume of tissue, detect light scattered by the volume of tissue, and provide a first output signal corresponding to an intensity of the detected light. A control module is coupled to the light source to control the light source to emit light at least four spaced-apart light wavelengths, and a monitoring module is coupled to the light detector to receive the output signal, compute a measure of tissue oxygenation in response to the light detector output signal, and detect tissue hypoxia using the measure of tissue oxygenation.12-16-2010
20100331638REFLECTANCE AND/OR TRANSMISSIVE PULSE OXIMETER - According to various embodiments, a medical sensor assembly may be configured to switch between transmission and reflectance mode. Such sensors may include multiple optical sensing components that may be activated or silent, depending on the mode in use. A practitioner may switch between modes based on the particular situation of the patient or based on the signal quality.12-30-2010
20100331639Pulse Oximetry System for Adjusting Medical Ventilation - A physiological monitoring system can include a physiological monitor having one or more processors that can derive oxygen saturation values from a patient. The oxygen saturation values can correspond to values of oxygen saturation in blood at a tissue site of the patient. The physiological monitor can output an indication of amplitude of the differences per respiratory cycle in the oxygen saturation values.12-30-2010
20110009721NEAR-INFRARED SPECTROSCOPY SENSOR WITH LIGHT SHEET - A sensor includes a sensor pad configured to be disposed on a portion of a patient's body. A light sheet is disposed on the sensor pad and has a first substrate and a second substrate spaced from one another. The light sheet further includes a light source configured to emit near-infrared light and a light detector configured to detect near-infrared light. The light source and the light detector are disposed between the substrates. The sensor pad is configured to allow light generated by the light source to travel through the portion of the patient's body to the light detector. The light received by the light detector is indicative of oxygen saturation of the portion of the patient's body through which the light travelled.01-13-2011
20090240125INTEGRATED PULSE OXIMETRY SENSOR - In a medical pulse oximetry sensor (09-24-2009
20110034788METHODS AND APPARATUS FOR USING MULTIPLE SENSORS TO MEASURE DIFFERENTIAL BLOOD TRANSPORT TIME IN A PATIENT - The difference in time that it takes for blood to flow to two locations in a patient's body can be measured by placing, on the patient's body, sensors for non-invasively detecting a variable characteristic of the content of the blood at each of those locations. The time of occurrence of a change in that characteristic as detected by one of the sensors is compared to the time of occurrence of that same change as detected by the other sensor. The difference between these two times is a measure of the difference in time that it takes for blood to flow to the locations of the two sensors.02-10-2011
20110245639PHYSIOLOGICAL PARAMETER STATISTICAL PROCESSING AND DISPLAY - A patient monitoring system has a processor and a spectrophotometric sensor. The sensor is configured to be affixed to a patient to communicate signals associated with real time spectrophotometric measurements to the processor. The system further includes memory for storing data and computer instructions. The processor is configured to execute instructions stored in the memory to calculate a trend statistic based on a group of the signals received from the sensor. The processor is further configured to execute instructions stored in the memory to cause real time information associated with the spectrophotometric measurements and information associated with the trend statistic to be displayed on a visual user interface.10-06-2011
20110245638THERMOELECTRIC ENERGY HARVESTING WITH WIRELESS SENSORS - A system and method for generating power from temperature differences across a thermoelectric energy harvester. The system may include one or more sensing components which, acting alone or in combination, are capable of generating data related to one or more physiological parameters. The system may also include wireless communication circuitry capable of wirelessly transmitting the data related to the one or more physiological parameters. Furthermore, at least one of the one or more sensing components or the wireless communication circuitry may be at least partially powered, directly or indirectly, by energy generated via the thermoelectric energy harvester.10-06-2011
20110124990PHYSIOLOGICAL TREND MONITOR - A physiological trend monitor has a sensor signal responsive to multiple wavelengths of light transmitted into a tissue site. The transmitted light is detected after attenuation by pulsatile blood flow within the tissue site. A processor has an input responsive to the sensor signal and a physiological parameter output. Features are extracted from the physiological parameter output. Criteria are applied to the features. An alarm output is generated when the criteria are satisfied.05-26-2011
20090082650IMAGING OF OXYGEN BY PHOSPHORESCENCE QUENCHING - A method of real-time imaging of dissolved oxygen concentration, comprising adding an oxygen-quenched phosphorescent composition to a sample, exciting phosphorescence in the composition by illuminating the sample with pulses of light, detecting phosphorescence intensity as a function of position in the sample at first and second times following exciting pulses of light, determining oxygen concentration from the phosphorescence detected at the first and second times, generating an image of the oxygen concentration as a function of position, and repeating the exciting, detecting, determining, and image generating steps to produce a series of images showing the oxygen concentration varying over time.03-26-2009
20090259116Method and Apparatus for Processing a Pulsatile Biometric Signal - A method for processing a pulsatile signal of light reflected from a living subject can include the step of activating a light source to transmit light to the living subject during an accumulation time. The method can include the step of detecting at least one sample of the light reflected from the living subject using a detector unit and determining if the sample(s) of light approaches a saturation level of the detector unit. The method can include the step of adjusting the accumulation time to prevent saturation of the detector unit if it has been determined that the at least one sample of light has approached a saturation level of the detector unit.10-15-2009
20100130840OPTICAL SENSOR PATH SELECTION - A device includes a sensor for measuring a parameter for tissue. The sensor includes a plurality of optical elements including a plurality of detectors and at least one emitter. Separation distances between the various optical elements are selected based on a depth corresponding to a region of interest in the tissue and based on a depth corresponding to an exclusion region in the tissue.05-27-2010
20110098544SYSTEM AND METHOD FOR INTEGRATING VOICE WITH A MEDICAL DEVICE - There is provided a system and method for integrating voice with a medical device. More specifically, in one embodiment, there is provided a medical device comprising a speech recognition system configured to receive a processed voice, compare the processed voice to a speech database, identify a command for the medical device corresponding to the processed voice based on the comparison, and execute the identified medical device command.04-28-2011
20110077482PORTABLE ELECTRONIC DEVICE AND METHOD FOR USING THE SAME - A portable electronic device having at least one function module selected from a group consisting of a wireless communication module, an image capturing module, and an audio/video file player module also includes a blood oxygen saturation (SaO03-31-2011
20090247849Pulse Oximeter With Adaptive Power Conservation - Embodiments disclosed herein may include systems and methods for reducing power consumption of a pulse oximeter. The disclosure describes method for measuring oxygen saturation of a patient's blood with a pulse oximeter that switches between a high power mode of operation and one or more low power modes of operation based at least in part upon the data obtained from the patient or otherwise generated by the pulse oximeter. In one embodiment, the disclosure describes a operating a pulse oximeter in a high power mode, the pulse oximeter using a sensor to generate data indicative of the oxygen saturation of the patient's blood at a first resolution and switching the pulse oximeter to a low power mode upon detection of data indicative of a non-critical situation. The low power mode may be selected from a set of available low power modes based at least in part upon the data generated by the pulse oximeter.10-01-2009
20090247850Manually Powered Oximeter - Embodiments disclosed herein may include a medical device and a method for powering a medical device are disclosed. The medical device may be able to operate independent of a plug-in and a wall socket as a power source by way of a manual power source. Additionally, shock resistant components are described which may protect the medical device from damage typically encountered during manually powering and using the pulse oximeter in areas where traditional power sources such as a wall outlet are unavailable.10-01-2009
20110152649DEVICE FOR MEASURING BLOOD, TISSUE, AND SKIN PARAMETERS - The invention relates to a device and a method for measuring of blood, tissue, or skin parameters, in particular the oxygen saturation in blood, by attaching to body parts such as fingers, earlobes, toes, hand, or foot. The invention relates further to a method for the preparation of said device.06-23-2011
20080312517Sensor for Eliminating Undesired Components and Measurements Method Using Said Sensor - In the present invention a novel method and device for measuring characteristics from a relatively weak signal comprising desired and undesired components is presented. Undesired signals may arise from the nature of the characteristic, from the detector or from the circuitry. The signal is extracted from a first measurement element (12-18-2008
20120302845SYSTEM AND METHOD FOR SPO2 INSTABILITY DETECTION AND QUANTIFICATION - The disclosed embodiments relate to a system and method for analyzing data. An exemplary method comprises the acts of receiving data corresponding to at least one time series, and computing a plurality of sequential instability index values of the data. An exemplary system comprises a source of data indicative of at least one time series of data, and a processor that is adapted to compute at least one of a plurality of sequential instability index values of the data.11-29-2012
20080255436Method for Enhancing Pulse Oximery Calculations in the Presence of Correlated Artifacts - A method for determining a physiological parameter in the presence of correlated artifact, including obtaining two digital waveforms, x and y, the waveforms being representative of the absorption of two wavelengths of electromagnetic energy received from a blood-perfused tissue, and where each of the waveforms has a component corresponding to a plethysmographic waveform and a component corresponding to the correlated artifact; calculating several weighted difference waveforms of the form x−R*y, where R is a multiplier, by varying R over a range; evaluating the several weighted difference waveforms using a shape characteristic of the weighted difference waveform; identifying a weighted difference waveform most closely representative of and one most different from the plethysmographic waveform; determining a pleth-based physiological parameter using the waveform most closely representative of the plethysmographic waveform; determining at least one artifact-based physiological parameter using the waveform most different from the plethysmographic waveform; and rejecting other possible candidate values for the pleth-based physiological parameter using the artifact-based physiological parameter.10-16-2008
20110054279DIAGNOSIS OF PERIODIC BREATHING - A method for diagnosis comprises receiving a signal associated with respiration of a patient. The signal is processed so as to identify features that are indicative of beginning and end times of apnea episodes. Time shifts between recurrences of the features are computed and processed so as to generate an output comprising a plurality of bands corresponding to different multiples of a cycle length of the apnea episodes.03-03-2011
20100305417BIOLOGICAL INFORMATION MEASUREMENT DEVICE CAPABLE OF ACCURATELY CONDUCTING MEASUREMENT, THAT CAN SAFELY BE USED - A biological information measurement device is constituted of an upper cover and a lower cover and a main body portion. Then, the upper cover and the lower cover are assembled such that they partially overlap with each other. A fingertip insertion portion is formed of a holding member, on which a substrate and a line of the main body portion are placed. By covering the whole main body by assembling the upper cover and the lower cover, the substrate and the line of the main body portion arranged on a side surface of the main body in the inside cannot externally be seen.12-02-2010
20100324384BODY-WORN PULSE OXIMETER - The invention provides a body-worn system that continuously measures pulse oximetry and blood pressure, along with motion, posture, and activity level, from an ambulatory patient. The system features an oximetry probe that comfortably clips to the base of the patient's thumb, thereby freeing up their fingers for conventional activities in a hospital, such as reading and eating. The probe secures to the thumb and measures time-dependent signals corresponding to LEDs operating near 660 and 905 nm. Analog versions of these signals pass through a low-profile cable to a wrist-worn transceiver that encloses a processing unit. Also within the wrist-worn transceiver is an accelerometer, a wireless system that sends information through a network to a remote receiver, e.g. a computer located in a central nursing station.12-23-2010
20100191080Method for noninvasive continuous determination of physiologic characteristics - The invention comprises methods for noninvasively monitoring physiological characteristics of a patient's blood. Determinations of blood constituent concentrations may be made by comparing absorbance of radiation at varying parameters, such as path length and blood pressure. Preferably, changes in pressure are effected by changing the height of the probes relative to the patient's heart. Determinations of blood pH may be made by comparing absorbance of the blood at different wavelengths. The temperature of the blood, and thus of the patient's core, may also be accurately determined. Further, cardiac output characteristics and blood pressures may be noninvasively determined using the methods of the invention.07-29-2010
20100191079BRAIN IMAGING SYSTEM AND METHODS FOR DIRECT PROSTHESIS CONTROL - Methods and systems for controlling a prosthesis using a brain imager that images a localized portion of the brain are provided according to one embodiment of the invention. The brain imager provides motor cortex activation data by illuminating the motor cortex with near infrared light (NIR) and detecting the spectral changes of the NIR light as passes through the brain. These spectral changes can be correlated with brain activity related to limbic control and may be provided to a neural network, for example, a fuzzy neural network that maps brain activity data to limbic control data. The limbic control data may then be used to control a prosthetic limb. Other embodiments of the invention include fiber optics that provide light to and receive light from the surface of the scalp through hair.07-29-2010
20110190612Continous Light Emission Photoacoustic Spectroscopy - Methods and systems are provided for analyzing microcirculation using photoacoustic spectroscopy by emitting continuous light at one or more frequencies. A photoacoustic spectroscopy monitor may utilize a slow modulation method to vary the wavelength of light emitted, such that different absorbers may be measured in a patient's tissue. The photoacoustic spectroscopy sensor may emit a lower power continuous light towards a patient's tissue. The acoustic response generated by the tissue may be sensed by a thin polymer sensing film at the detector of the sensor. Based on the amplitude and phase information of the acoustic response sensed by the detector, the monitor may determine a concentration of an absorber, as well as a location of the absorbers, in the patient's tissue.08-04-2011
20110190611OXYGENATION PROCEDURES FOR NEWBORNS AND DEVICES FOR USE THEREIN - The present invention relates to methods and systems for resuscitation of an infant which maintains healthy blood oxygen saturation values in the infant by titration of supplemental oxygen concentrations.08-04-2011
20120172688METHOD AND SYSTEM FOR DETECTION OF RESPIRATORY VARIATION IN PLETHYSMOGRAPHIC OXIMETRY - A method and system for detection of respiratory variation in pulse oximetry are provided. In one embodiment, the method includes detecting a pattern consistent with a respiratory cycle of a waveform representing cardiac oscillations and identifying an abnormality based on the pattern. A system is further provided including a database and a module. The database to store data representing a physiological condition of a patient over a period of time, wherein the data comprises data corresponding to respiratory activity and data corresponding to cardiac oscillations, wherein the data corresponding to respiratory activity comprises a first waveform and the data corresponding to the cardiac oscillations comprises a second waveform; and a module for detecting a pattern of the second waveform consistent with a cycle of a first waveform and detecting an abnormality in the pattern.07-05-2012
20100016690Systems And Methods For Determining Oxygen Saturation - According to embodiments, techniques for using continuous wavelet transforms and spectral transforms to determine oxygen saturation from photoplethysmographic (PPG) signals are disclosed. According to embodiments, a first oxygen saturation may be determined from wavelet transformed PPG signals and a second oxygen saturation may be determined from spectral transformed PPG signals. An optimal oxygen saturation may be determined by selecting one of the first and the second oxygen saturation or by combining the first and the second oxygen saturation. According to embodiments, a spectral transform of PPG signals may be performed to identify a frequency region associated with a pulse rate of the PPG signal. A continuous wavelet transform of the PPG signals at a scale corresponding to the identified frequency region may be performed to determine oxygen saturation from the wavelet transformed signal.01-21-2010
20100016691Methods And Systems For Determining Whether To trigger An Alarm - According to embodiment, systems and methods for processing a physiological measurement and generating alarms based on the measurement are provided. Multiple features of a single physiological measurement may be concurrently monitored to generate alarms. One or more of the features may be based on a trend of the physiological measurement. One or more of the features may be based on a wavelet transform of the physiological measurement. Different features may be used in different combinations to lower the percentage of false alarms while still recognizing valid alarm events.01-21-2010
20110118573Medical Device Alarm Modeling - Embodiments of the present disclosure relate to patient monitors with alarm modeling features that may be employed to set alarm limits. According to certain embodiments, the patient monitors may include a user interface for setting alarm limits that may be displayed on the patient monitors and/or on an external device, such as a central monitoring station. The user interface may allow a user to vary alarm limit settings and view how the settings change the alarm history for a representative data trend.05-19-2011
20100030042METHOD AND DEVICE FOR DETERMINING OXYGEN SATURATION OF HEMOGLOBIN, FOR DETERMINING HEMATOCRIT OF BLOOD, AND/OR FOR DETECTING MACULAR DEGENERATION - A method and device for accurately determining oxygen saturation of hemoglobin by the measurement of the optical density of a sample, such as a blood vessel, in response to illumination by light having at least three wavelengths (λi, λ2, λ3, . . . ) within a range of about 460 nm to about 523 nm. The hematocrit of a sample may be determined from optical density measurements at the three or more wavelengths in conjunction with a known path length. The device may be an intravenous or intra-arterial fiber optic catheter used to deliver the interrogating light signal to the blood and to detect the reflected signal. A method and device of determining the thickness of the retinal well using spectroscopic information are also disclosed.02-04-2010
20110028812METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING - A method and apparatus for non-invasively determining a blood oxygenation level within a subject's tissue is provided. The method includes the steps of: a) providing a spectrophotometric sensor operable to transmit light into the subject's tissue, and to sense the light; b) inputting into the sensor at least one of the subject's age, weight, brain development, and head size; c) spectrophotometrically sensing the subject's tissue along a plurality of wavelengths using the sensor, and producing signal data from sensing the subject's tissue; and d) processing the signal data utilizing the at least one of the subject's age, weight, brain development, and head size, to determine the blood oxygen saturation level within the subject's tissue using a difference in attenuation between the wavelengths.02-03-2011
20100210929PORTABLE ST02 SPECTROMETER - Devices, systems, and methods for measuring tissue oxygen saturation (StO08-19-2010
20110306858Systems And Methods For Wavelet Transform Using Mean-Adjusted Wavelets - Methods and systems are disclosed for transforming a signal using a continuous wavelet transform based at least in part on a truncated, mean-adjusted wavelet. A wavelet may be truncated to a finite support to generate a truncated wavelet. The real part of the truncated wavelet may be forced to have a zero mean to generate a truncated, mean-adjusted wavelet. The signal may be transformed using a continuous wavelet transform based at least in part on the truncated mean-adjusted wavelet. Information may be derived about the signal from the transformed signal.12-15-2011
20100198027NON-INVASIVE MEASUREMENT OF BLOOD OXYGEN SATURATION - The invention relates to a method for non-invasive determination of oxygen saturation of blood within a deep vascular structure of a human patient comprising locating on skin of the patient in a vicinity of the deep vascular structure of interest emitter and receiver elements of a light oximeter device, wherein optimal location of said elements is achieved through matching of a plethysmography trace obtained from the oximeter device to known plethysmography characteristics of the deep vascular structure of interest, and wherein oxygen saturation is determined from a ratio of light absorbed at different wavelengths by haemoglobin in the blood within the vascular structure of interest. The invention also relates to modified oximetry devices capable of carrying out the method.08-05-2010
20090270702METHOD AND APPARATUS FOR MEASURING CANCEROUS CHANGES FROM REFLECTANCE SPECTRAL MEASUREMENTS OBTAINED DURING ENDOSCOPIC IMAGING - The present invention provides a new method and device for disease detection, more particularly cancer detection, from the analysis of diffuse reflectance spectra measured in vivo during endoscopic imaging. The measured diffuse reflectance spectra are analyzed using a specially developed light-transport model and numerical method to derive quantitative parameters related to tissue physiology and morphology. The method also corrects the effects of the specular reflection and the varying distance between endoscope tip and tissue surface on the clinical reflectance measurements. The model allows us to obtain the absorption coefficient (μa) and further to derive the tissue micro-vascular blood volume fraction and the tissue blood oxygen saturation parameters. It also allows us to obtain the scattering coefficients (μs and g) and further to derive the tissue micro-particles volume fraction and size distribution parameters.10-29-2009
20120065485APPARATUS AND METHOD FOR NON-INVASIVELY DETERMINING OXYGEN SATURATION OF VENOUS BLOOD AND CARDIAC OUTPUT USING NIRS - A method and apparatus for determining a venous oxygen saturation value (SvO2) of a subject is provided. The method includes the steps of: a) sensing a plurality of tissue regions on a subject using a NIRS oximeter adapted to determine a tissue oxygen saturation value (StO2) for each region, each region independent of the other regions and each region sensed using a NIRS oximeter sensor specific to that region, and determining a StO2 value for that region; b) assigning a coefficient to each region, each of which coefficients reflects a portion of the StO2 value for the region attributable to a composite venous blood return representative of the tissue regions measured; and c) determining a composite SvO2 value for the subject using the StO2 region values and the respective coefficients.03-15-2012
20120016218DISCRIMINATION OF CHEYNE-STOKES BREATHING PATTERNS BY USE OF OXIMETRY SIGNALS - Methods and apparatus provide Cheyne-Stokes respiration (“CSR”) detection based on a blood gas measurements such as oximetry. In some embodiments, a duration, such as a mean duration of contiguous periods of changing saturation or re-saturation occurring in an epoch taken from a processed oximetry signal, is determined. An occurrence of CSR may be detected from a comparison of the duration and a threshold derived to differentiate saturation changes due to CSR respiration and saturation changes due to obstructive sleep apnea. The threshold may be a discriminant function derived as a classifier by an automated training method. The discriminant function may be further implemented to characterize the epoch for CSR based on a frequency analysis of the oximetry data. Distance from the discriminant function may be utilized to generate probability values for the CSR detection.01-19-2012
20120310059Clinical Acceptance Tool - Provided herein are methods and apparatuses for facilitating clinical acceptance of patient monitoring features. These methods may be used in conjunction with a computer that includes software for viewing the type of display associated with the monitoring feature. The clinical acceptance systems as provided herein may display a new or experimental monitoring feature along with a benchmark feature that a clinician is familiar with. In certain embodiments, the viewing tool may be isolated from the calculation tools so that the computer may include stored files that are in a format ready for display.12-06-2012
20120022348SYSTEMS AND METHODS FOR NON-CONTACT MULTIPARAMETER VITAL SIGNS MONITORING, APNEA THERAPY, SWAY CANCELLATION, PATIENT IDENTIFICATION, AND SUBJECT MONITORING SENSORS - Aspects of the of the disclosure relate to a non-contact physiological motion sensor and a monitor device that can incorporate use of the Doppler effect. A continuous wave of electromagnetic radiation can be transmitted toward one or more subjects and the Doppler-shifted received signals can be digitized and/or processed subsequently to extract information related to the cardiopulmonary motion in the one or more subjects. The extracted information can be used, for example, to determine apneic events and/or to provide apnea therapy to subjects when used in conjunction with an apnea therapy device. In addition, methods of use are disclosed for sway cancellation, realization of cessation of breath, integration with multi-parameter patient monitoring systems, providing positive providing patient identification, or any combination thereof.01-26-2012
20120059233DISPOSABLE AND DETACHABLE SENSOR FOR CONTINUOUS NON-INVASIVE ARTERIAL BLOOD PRESSURE MONITORING - A sensor system for continuous non-invasive arterial blood pressure (CNAP) is provided. The CNAP-sensor comprises of a base portion and a detachable and disposable portion. The base portion is connected to a control system. The disposable portion is for attachment to a human body part. The CNAP-sensor system includes a photo-plethysmographic (PPG) system having at least one light source, at least one light detector, electrical supplies, light coupling systems, one or more connectors, and a cuff including air supplies.03-08-2012
20120116192ENDOSCOPIC DIAGNOSIS SYSTEM - An endoscopic diagnosis system accurately calculating the oxygen saturation level considering the effects of the blood vessel depth and the blood amount and displaying an oxygen saturation level distribution in simulated colors includes an endoscope device for illuminating a subject, imaging reflected light, and acquiring image signals corresponding to three or more reflected light having a wavelength range of 460 to 700 nm including a first and a second image signal corresponding to reflected light having two wavelength ranges where the light absorption coefficient changes according to the blood hemoglobin oxygen saturation level and a third image signal corresponding to reflected light having one wavelength range where the light absorption coefficient does not change; a blood amount-oxygen saturation level calculator using the acquired image signals for calculation; and a display for displaying an oxygen saturation level distribution based on the oxygen saturation level information.05-10-2012
20100121164Oximeter device - An oximeter has a housing configured to have a cavity defining portion that is adapted to be fitted with covers of various dimensions to effect receptacles of different dimensions for accommodating differently sized sensor of sensor assemblies that are matable to the oximeter for sensing physical attributes of a patient. Each of the covers, once fully fitted to the housing, is fixedly latched thereto unless a force that overcomes the latching is applied to remove the cover. The effected receptacle is adapted to biasedly retain a corresponding sensor placed therein. The holstered sensor therefore would not accidentally fall out or be removed from the receptacle, until the user deliberately applies a force to remove the sensor from the receptacle.05-13-2010
20120071739WAVELENGTH SWITCHING FOR PULSE OXIMETRY - The present disclosure describes techniques that may provide more accurate estimates of arterial oxygen saturation using pulse oximetry by switching between a wavelength spectrum of at least a first and a second light source so that the arterial oxygen saturation estimates at low (e.g., in the range below 75%), medium (e.g., greater than or equal to 75% and less than or equal to 84%), and high (e.g., greater than 84% range) arterial oxygen saturation values are more accurately calculated. In one embodiment, light emitted from a near 660 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is high. In another embodiment, light emitted from a near 730 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is low. In yet another embodiment, light emitted from both a near 660 nm-900 nm emitter pair and light emitted from a near 730 nm-900 nm emitter pair may be used when the arterial oxygen saturation range is in the middle range. Priming techniques may also be used to reduce or eliminate start up delays of certain oximetry system components.03-22-2012
20110092785Selection of Ensemble Averaging Weights for a Pulse Oximeter Based on Signal Quality Metrics - A pulse oximeter system is presently disclosed. The pulse oximeter system includes a processor and circuitry. The processor and circuitry are configured to receive light waveforms from a sensor, determine at least one signal quality metric for the light waveforms, calculate at least one weight using a continuously variable weighting function based on the at least one signal quality metric, and ensemble average the light waveforms using the at least one calculated weight.04-21-2011
20120071740DISPOSABLE Sp02 GRIPS - When monitoring blood oxygen levels in a patient during a magnetic resonance scan, detachable and reusable fiber optic cable heads (03-22-2012
20110066015OXIMETER SENSOR WITH DIGITAL MEMORY ENCODING PATIENT DATA - The present invention provides a memory chip for use in an oximeter sensor, or an associated adapter or connector circuit. The memory chip allows the storing of patient related data, such as patient trending data or a patient ID, to provide enhanced capabilities for the oximeter sensor. In addition to providing unique data to store in such a memory, the present invention include unique uses of the data stored in such a memory.03-17-2011
20110066014METHOD AND APPARATUS FOR CEREBRAL OXIMETRY - The present invention pertains to a method and apparatus for cerebral oximetry. A modulated optical signal based on a digital code sequence is transmitted to the human brain. A temporal transfer characteristic is derived from the modulated optical signal. Oxygen level in the brain is determined based on the temporal transfer characteristic.03-17-2011
20110066013PHYSIOLOGICAL PARAMETER MONITORING APPARATUS - A tissue oximeter sensor includes a substrate with a non-zero finite depth and first and second major sides. At least a first material free region extends along the depth from one of the sides to the other of the two sides forming a first well in the substrate. One of the sides of the substrate is configured to be removeably affixed to a human or animal subject. The sensor also includes a first channel with first and second end portions. One of the end portions of the first channel is selectively positioned in the first well along the depth alternatively at one of a plurality of different depth positions. The first channel routes radiation at least one of from the first end portion to the second end portion or from the second end portion to the first end portion.03-17-2011
20100094108SYSTEM FOR DETERMINING AND MONITORING DESATURATION INDICES AND INSTANTANEOUS RESPIRATORY RATE - Determining and monitoring desaturation indices and instantaneous respiratory rate, based on extracting components from the blood oxygen saturation (SpO04-15-2010
20090131774Single use pulse oximeter - A single use, self-contained, self-powered disposable oximeter, in the form of a patch or a bandage strip, has mounted thereto a light emitter and a light sensor that together measure at least the SpO2 of the patient. Mounted to an electronics layer of the patch is an application specific integrated circuit (ASIC) that has electronics integrated thereto that controls the operation of the light emitter and light sensor, and the algorithm for calculating from the data collected by the sensor at least the SpO2 of the patient. Optionally, a display and an alarm may also be mounted or embedded onto the patch for respectively displaying at least the SpO2, and for informing the caregiver/patient that at least the SpO2 is not within an acceptable range, if such is the case. Also provided in the patch is a battery that powers the operation of the ASIC circuit and the emitter, as well as the display and alarm if such optional components are provided on the patch. An attachment mechanism is also provided on the patch. Such mechanism may be in the form of an adhesive layer that can removably attach the patch to the patient in either a transmissive mode or a reflective mode. The patch oximeter may also be equipped with a transceiver, and the appropriate electronics, for wirelessly transceiving information to/from a remote device or another wireless patch oximeter. In place of a self-contained power source, the power for operating a wireless patch oximeter may be retrieved from a remote power source, provided that the patch oximeter is within a given distance from such remote power source.05-21-2009
20120165630ADVANCED SYSTEM AND METHOD FOR OXYGEN SATURATION MONITORING - A method that includes configuring a first and a second identification band with unique serial numbers, each of said bands being connected to a signal cable attached to a sensor is provided. The first identification band is securely fixed to a first location on the patient and the second identification band is securely fixed to a second location on the patient. The first and second identification bands are connected with a bridging band. The signal cable is connected to a diagnostic test monitoring system and the patient's oxygen saturation is monitored. The first and second identification bands are configured to evidence tampering when removed.06-28-2012
20120165629SYSTEMS AND METHODS OF MONITORING A PATIENT THROUGH FREQUENCY-DOMAIN PHOTO MIGRATION SPECTROSCOPY - FDPM processing provides an amplitude signal and a phase signal at a modulation frequency to improve measurement fidelity during measurement of one or more blood parameters. In an embodiment, a light source modulates light at a modulation frequency around 200 MHz to produce an amplitude and phase plethysmograph, usable to access clinical test data.06-28-2012
20120130210Sensor for measuring amount of substance in blood and method of making the sensor - Sensor and method for measuring amount of substance in blood. The sensor comprises a base element having a surface, and at least one light emitting diode emitting at pre-determined wavelength, and a photodetector which is sensitive to the pre-determined wavelength. The at least one light emitting diode comprises at least one emissive layer having been printed onto the surface.05-24-2012
20120220842REUSABLE PULSE OXIMETER PROBE AND DISPOSABLE BANDAGE APPARATII - A disposable portion of an optical probe is usable to determine at least one physiological parameter. The disposable portion comprises a bandage including adhesive on at least a portion of at least one face thereof. The bandage comprises a first receptacle at a first position. The first receptacle is configured to receive and removably engage a probe emitter. The bandage comprises a second receptacle at a second position. The second position is spaced from the first position. The second receptacle is configured to receive and removably engage a probe detector. The first receptacle at the first position is positioned generally opposite the second receptacle at the second position when the bandage is positioned on an appendage of a patient for sensing a physiological parameter of the patient.08-30-2012
20120172687Certification Apparatus And Method For A Medical Device Computer - Provided herein are methods and apparatuses for certifying computers for use in conjunction with medical devices. These methods may be used in conjunction with a computer that includes software for operating the medical device. To certify a particular computer, one or more testing algorithms or routines for processing data, e.g., data representative of a typical output generated by use of the medical device on a patient, may be executed and the results may be compared to an expected result. In particular embodiments, the certification process may use data stored on the device itself to determine certification or may use data stored with or bundled with the software for operating the device.07-05-2012
20120136225METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING OF THE LOWER GASTROINTESTINAL TRACT - A method and apparatus for non-invasively determining a blood oxygen saturation level and/or the presence of fecal matter within a subject's lower GI tissue is provided. The method includes the steps of: a) providing a spectrophotometric sensor operable to transmit light into the subject's tissue, and to sense the light; b) sensing the subject's lower GI Tissue Using the Sensor, and Producing signal data from sensing the subject's tissue; c) processing the signal data, including determining the presence of one or more wavelength dependent light absorbing materials not present within blood within the subject's lower GI tract from the signal data; and d) determining the blood oxygen saturation level and/or presence of fecal matter within the subject's lower GI tissue, including accounting for the presence of the wavelength dependent light absorbing material not present within blood within the subject's lower GI tract determined using the signal data.05-31-2012
20100198029Patient Monitoring Using Combination of Continuous Wave Spectrophotometry and Phase Modulation Spectrophotometry - Non-invasive spectrophotometric monitoring of oxygen saturation levels based on a combination of continuous wave spectrophotometry (CWS) and phase modulation spectrophotometry (PMS) is described. First information representative of absolute oxygen saturation levels in relatively shallow regions of a patient tissue volume are acquired from PMS-based monitoring thereof during a reference interval. Second information representative of non-absolute oxygen saturation levels in relatively deep regions of the tissue volume are acquired from CWS-based monitoring thereof during the reference interval. Based on the first and second information acquired during the reference interval, a mapping is automatically determined between the second information and estimated absolute oxygen saturation metrics for the relatively deep regions. On a continuing basis during a monitoring interval subsequent to the reference interval, the second information continuously acquired from CWS-based monitoring of the tissue volume are continuously mapped into estimated absolute oxygen saturation metrics, which are continuously displayed on a display output.08-05-2010
20100198030Solid-State General Illumination With Broadband White LED And Integrated Heat Sink - A solid-state illuminator (08-05-2010
20120215081Method and Apparatus for Predicting Work of Breathing - A method of creating a noninvasive predictor of both physiologic and imposed patient effort of breathing from airway pressure and flow sensors attached to the patient using an adaptive mathematical model. The patient effort is commonly measured via work of breathing, power of breathing, or pressure-time product of esophageal pressure and is important for properly adjusting ventilatory support for spontaneously breathing patients. The method of calculating this noninvasive predictor is based on linear or non-linear calculations using multiple parameters derived from the above-mentioned sensors.08-23-2012
20100049018APPARATUS FOR SPECTROMETRIC BASED OXIMETRY - A spectrophotometric sensor assembly for non-invasive monitoring of a blood metabolite within a subject's body tissue is provided that includes a pad, a light source, and a light detector The light source is operative to emit light signals of a plurality of different wavelengths. The light detector is operative to detect light emitted by the light source and passed through the subject's body tissue. The light detector is at least partially enclosed in EMI shielding. In some embodiments, the light detector and EMI shielding are disposed in a detector housing that encloses the light detector and shielding. The housing is aligned with a detector aperture disposed in the pad.02-25-2010
20090112073PULSE OXIMETER PROBE-OFF DETECTOR - A processor provides signal quality based limits to a signal strength operating region of a pulse oximeter. These limits are superimposed on the typical gain dependent signal strength limits. If a sensor signal appears physiologically generated, the pulse oximeter is allowed to operate with minimal signal strength, maximizing low perfusion performance. If a sensor signal is potentially due to a signal induced by a dislodged sensor, signal strength requirements are raised. Thus, signal quality limitations enhance probe off detection without significantly impacting low perfusion performance. One signal quality measure used is pulse rate density, which defines the percentage of time physiologically acceptable pulses are occurring. If the detected signal contains a significant percentage of unacceptable pulses, the minimum required signal strength is raised proportionately. Another signal quality measure used in conjunction with pulse rate density is energy ratio, computed as the percentage of total energy contained in the pulse rate fundamental and associated harmonics.04-30-2009
20120190946TISSUE OXIMETRY APPARATUS AND METHOD - An apparatus and method for determining tissue oxygenation such as arterial and venous oxygenation and cerebral oxygenation. In one embodiment, the optical properties of tissue are determined using measured light attenuations at a set of wavelengths. By choosing distinct wavelengths and using light attenuation information, the influence of variables such as light scattering, absorption and other optical tissue properties can be minimized.07-26-2012
20120190947PHYSIOLOGICAL PARAMETER MONITORING WITH A MOBILE COMMUNICATION DEVICE - Systems and methods that enable physiological monitoring with a mobile communication device and that allow detection of motion artifacts so that the results reported are of acceptable quality are disclosed.07-26-2012
20130018240BODY MEASUREMENT AND IMAGING WITH A MOBILE DEVICE - A standard handheld cellular telephone for obtaining diagnostic data is described. In at least one aspect, a standard handheld cellular telephone has a processor, a cellular transceiver, a signal transmitter, a signal receiver and memory for storing instructions for execution by the processor. The acoustic, electromagnetic, optical, and positioning functions of a cellular telephone are exploited. The standard handheld cellular telephone is configured to be capable of performing operations including causing the signal transmitter to transmit a signal through a medium when the signal transmitter is placed adjacent to the medium, receiving with the signal receiver one or more propagations of the transmitted signal after the transmitted signal has passed at least in part through the medium, and obtaining diagnostic data from the received one or more signal propagations.01-17-2013
20080300473Stabilized Multi-Wavelength Laser System for Non-Invasive Spectrophotometric Monitoring - A spectroscopy system that may be used for spectrophotometric oxygenation monitoring of tissue includes a monitor portion and a sensor portion. The sensor portion generally includes a light source and one or more light detectors. The sensor portion may attach to a human to sense light signals from the light source that have traversed biological tissue, the light signals ultimately being used by the system to determine biological tissue blood hemoglobin oxygenation levels. The monitor portion generally includes a processor and a visual display. A laser beam combiner may couple a plurality of laser diode output light signals into one optical fiber. To stabilize the output of each of the laser diodes, an optical fiber light stabilizer is coupled to the combined laser diode output. The optical fiber light stabilizer redistributes the modes in the optical fiber such that the higher-order modes are filled until an equilibrium mode distribution is established. A light sensor may also provide feedback with respect to the laser diode output, which allows for compensation of any laser diode light output instability independently of optical fiber related instabilities.12-04-2008
20080300472Method and Device for Optical Imaging of a Turbid Medium - Disclosed is a method and a device for optical imaging of a turbid medium. This method comprises a reference measurement of reference intensities of light emanating from the turbid medium at a reference blood oxygen saturation (SaO2) in the turbid medium and a reference imaging step for reconstructing a reference image of the turbid medium from the measured reference intensities. Furthermore the method comprises a contrast measurement of the contrast intensity of the light emanating from the turbid medium at a contrast blood oxygen saturation (SaO2) level in the turbid medium and a contrast imaging step for reconstructing a contrast image of the turbid medium from the measured contrast intensities. A comparison is made between the contrast image to the reference image of the turbid medium.12-04-2008
20110004082MULTI-STREAM DATA COLLECTION SYSTEM FOR NONINVASIVE MEASUREMENT OF BLOOD CONSTITUENTS - The present disclosure relates to noninvasive methods, devices, and systems for measuring various blood constituents or analytes, such as glucose. In an embodiment, a light source comprises LEDs and super-luminescent LEDs. The light source emits light at least wavelengths of about 1610 nm, about 1640 nm, and about 1665 nm. In an embodiment, the detector comprises a plurality of photodetectors arranged in a special geometry comprising one of a substantially linear substantially equal spaced geometry, a substantially linear substantially non-equal spaced geometry, and a substantially grid geometry.01-06-2011
20110046461NANOFIBER ADHESIVES USED IN MEDICAL DEVICES - Nanofiber adhesives and their uses with device, such as medical devices, are described. In one embodiment, a nanofiber adhesive layer may be disposed on a surface of a medical device, such as a backing layer of a sensor, for adhesion to a substrate. The nanofiber adhesive layer may allow durable adhesion to the substrate. Other described features may include materials and methods to determine the attachment of the medical device to a patient by determining the adhesive state of the adhesive layer.02-24-2011
20120265039PATIENT MONITOR FOR MONITORING MICROCIRCULATION - A patient monitor capable of measuring microcirculation at a tissue site includes a light source, a beam splitter, a photodetector and a patient monitor. Light emitted from the light source is split into a reference arm and a sample arm. The light in the sample arm is directed at a tissue site, such as an eyelid. The reflected light from the tissue site is interfered with the light from the reference arm. The photodetector measures the interference of the light from both the sample arm and the reference arm. The patient monitor uses the measurements from the photodetector to calculate the oxygen saturation at the tissue site and monitor the microcirculation at the tissue site.10-18-2012
20120265040BIOLOGICAL INFORMATION MONITORING APPARATUS AND BIOLOGICAL INFORMATION MONITORING METHOD - A biological information monitoring apparatus includes: an acquiring section configured to acquire biological information of a patient; a storage section configured to store a threshold which is changed with time from a first time; and a determining section configured to compare the biological information acquired by the acquiring section with a threshold corresponding to a second time when the biological information is acquired by the acquiring section, to perform determination of an abnormality of an living body of the patient.10-18-2012
20110046463PHYSIOLOGICAL SENSOR WITH A TAIL - An exemplary sensor includes a sensor pad defining a plurality of openings and a circuit board. The circuit board is at least partially disposed in the sensor pad and has a light source configured to generate near-infrared light and a light detector configured to receive near-infrared light. The light source and the light detector are each aligned with one of the openings of the sensor pad so that near-infrared light generated by the light source can travel through a part of a patient's body to the light detector and the near-infrared light received by the light detector indicates oxygen saturation of the part of the patient's body through which the light travelled. The circuit board further includes an integrally formed tail at least partially disposed in the sensor pad. Additionally, the sensor pad includes an overlay disposed on the tail.02-24-2011
20110046462BLOOD OXYGEN SATURATION MEASURING APPARATUS - A blood oxygen saturation measuring apparatus includes: a light emitter adapted to emit, to living tissue of a subject, at least two light beams which have different wavelengths from each other; a light receiver adapted to receive the light beams which are transmitted through or reflected from the living tissue, the light receiver which converts the received light beams to electric signals corresponding to receiving intensities of the light beams, respectively; an extractor which extracts frequency components corresponding to changes of the receiving intensities according to a variation of a blood volume of a vein in the living tissue due to respiration of the subject, from the electric signals, respectively; an attenuation ratio calculator which calculates a first attenuation ratio based on amplitudes of the extracted frequency components; and an oxygen saturation calculator which calculates a first blood oxygen saturation in the vein based on the first attenuation ratio.02-24-2011
20110237912Device and Method for Detecting a Vital Parameter - A device for detecting a vital parameter is described, comprising: an optoelectronic sensor arrangement for detecting the vital parameter by means of light remission at a finger, wherein the optoelectronic sensor arrangement has a first light source for generating light in a visible wavelength range, a second light source for generating light in a non-visible wavelength range and a light-sensitive element; and a controller which is implemented to switch on the second light source in temporal intervals, execute an evaluation of the light received from the light-sensitive element in the invisible wavelength range of the second light source with respect to whether a finger is applied to the optoelectronic sensor arrangement and to switch on the first light source as soon as the evaluation indicates that a finger is applied to the optoelectronic sensor arrangement.09-29-2011
20110237910STABILIZED MULTI-WAVELENGTH LASER SYSTEM FOR NON-INVASIVE SPECTROPHOTOMETRIC MONITORING - A spectroscopic method and system that monitors oxygenation levels in biological tissue is provided. The system includes a sensor portion, a monitor portion, and at least one optical fiber light stabilizer. The sensor portion includes at least one sensor assembly, which sensor assembly has at least one light signal outlet, and at least one light detector adapted to sense light and produce detected signals. The monitor portion has a processor in communication with the light detector in the sensor assembly, and a light source adapted to produce laser light signals at a plurality of different wavelengths. The optical fiber light stabilizer is adapted to stabilize the laser light signals. The processor is adapted to process the detected signals to determine oxygenation levels within the biological tissue.09-29-2011
20110251470STRETCHABLE ELECTRODE AND METHOD OF MAKING PHYSIOLOGIC MEASUREMENTS - A stretchable electrode for use in physiologic measurements on a human body, such as peripheral impedance plethysmography, is disclosed. One embodiment of the stretchable electrode comprises an uninsulated stainless steel wire braid formed into a tubular conductor surrounding an elastic core and attached to an elastic substrate or base. Other embodiments of the stretchable electrode include a garter spring, a flat braided or woven conductor and an undulating wire. The electrode may be placed about a limb of a human body and elastically stretched so that the conductor is in substantially continuous circumferential electrical contact with the skin of the limb. A method of attaching the stretchable electrode to the limb of a human body is also disclosed.10-13-2011
20120088992METHOD FOR DETECTING AND DISCRIMINATING BREATHING PATTERNS FROM RESPIRATORY SIGNALS - A Cheyne-Stokes (CS) diagnosis system classifies periods of CS-like breathing by examining a signal indicative of a respiratory parameter. For example, nasal flow data is processed to classify it as unambiguously CS breathing or nearly so and to display the classification Processing may detect and display: apnoeas, hypopnoeas, flow-limitation and snore. The signal may be split into equal length epochs and event features are extracted. Statistics are applied to these primary feature(s) to produce secondary feature(s) representing the entire epoch. Each secondary feature is grouped with other feature(s) extracted from the entire epoch rather than from the epoch events. This final group of features is the epoch pattern. The epoch pattern is classified to produce a probability for possible event classes (e.g., Cheyne-Stokes breathing, OSA, etc.). The epoch is assigned to the class with the highest probability, which may both be reported as an indication of disease state.04-12-2012
20120150002Systems and Methods Utilizing Plethysmographic Data for Distinguishing Arterial and Venous Saturations - Apparatus, systems and methods are provided for using the PG waveform to determine peripheral venous and arterial saturations. Generally, saturations are determined by isolating an indicator of venous or arterial blood volume in each of a plurality of PG waveforms and using the isolated indicators to determine saturation in the corresponding region of the vasculature. Indicators may include respiratory induced variations of AC and/or DC components of the PG waveforms, peaks of the PG waveforms, troughs of the PG waveforms, venous pulsations of the PG waveforms, etc. Indicators may further be isolated in either the time or frequency domain. The isolated indicators may advantageously be normalized, e.g., based on a baseline of the PG waveform or a derivative thereof.06-14-2012
20130023743OPTICAL SENSOR INCLUDING DISPOSABLE AND REUSABLE ELEMENTS - An embodiment of the present disclosure provides a noninvasive optical sensor or probe including disposable and reusable components. The assembly of the disposable and reusable components is straightforward, along with the disassembly thereof. During application to a measurement site, the assembled sensor is advantageously secured together while the componentry is advantageously properly positioned.01-24-2013
20080255435LOW NOISE OXIMETRY CABLE INCLUDING CONDUCTIVE CORDS - In an embodiment, one or more conductive cable cords are twisted with the sensitive signal carrying cables. The cords may advantageously comprise dummy wires, or very flexible hollow cables without an inner conductor. As the conductive cords do not carry and inner conductor, the conductive cords are individually flexible and small, resulting in a twisted bundle that more is flexible while potentially having a smaller outer diameter.10-16-2008
20080242959Fingertip Oximeter and a Method for Observing a Measurement Result Thereon - There is provided a fingertip oximeter that has a plurality of display modes which are presented sequentially in a circulating way, allowing users to easily observe a measurement result from any of surrounding directions. The present invention makes users to be able to observe a measurement result of the fingertip oximeter from any of surrounding directions, without the need of bending his/her finger. Thus, any partial occlusion of the arterial blood capillary can be avoided, so that strength of the pulse will not decrease, and strength of the signal will not be affected. As a result, the precision of the measurement is improved.10-02-2008
20080242958MULTIPLE WAVELENGTH OPTICAL SENSOR - A multiple wavelength optical sensor has an emitter configured to radiate light having a plurality of wavelengths into a tissue site. The emitter comprises a plurality of LEDs configured in an array and connected within an electrical grid. A detector is configured to receive the light after absorption by pulsatile blood flow within the tissue site. The detector generates a sensor signal capable of being processed by a patient monitor so as to derive oxygen saturation, carboxyhemoglobin, methemoglobin and total hemoglobin.10-02-2008
20080228052Physiological trend monitor - A physiological trend monitor has a sensor signal responsive to multiple wavelengths of light transmitted into a tissue site. The transmitted light is detected after attenuation by pulsatile blood flow within the tissue site. A processor has an input responsive to the sensor signal and a physiological parameter output. Features are extracted from the physiological parameter output. Criteria are applied to the features. An alarm output is generated when the criteria are satisfied.09-18-2008
20120253152Y-SHAPED EAR SENSOR WITH STRAIN RELIEF - The present disclosure relates to sensors for use on a patient's ear. The sensors as provided may be Y-shaped and configured to be retained on an ear with the forks of the Y-shape positioned below the main branch of the Y. In particular embodiments, the Y-shaped sensors may be affixed to the patient at locations on the head or neck to relieve strain and reduce the effects of motion on the optical components of the sensor.10-04-2012
20120253151Multiple Wavelength Pulse Oximetry With Sensor Redundancy - Systems and method are provided that enable a spectrophotometric system to obtain reasonably reliable measurements even in situations when some of the emitters included in a sensor system have become inoperable. In certain embodiments, the spectrophotometric system may include two or more light emitters. The light emitters may be used to derive measurements suitable for pulse oximetry, hemometry, and/or aquametry. The failure of one or more of the emitters may still allow for the derivation of certain measurements by using the emitters that remain in an operational state.10-04-2012
20130096401WIRELESS DISPOSABLE SHOCK TRAUMA MONITORING DEVICE - Apparatus for monitoring oxygen saturation levels in tissue for a miniature wireless disposable optical tissue oximeter to are disclosed. According to one aspect of the present invention, a sensor contains a first light source, a second light source, a photodetector, and a skin contact detector. Once skin contact is detected, the first light source emits light in the near infrared region, and the second light source emits light in the visible red region. The emitted light passes through a transparent layer of an adhesive fixation unit, and enters the underlying tissue, where a portion of the light is absorbed by tissue chromophores, including oxygenated hemoglobin and deoxygenated hemoglobin, and reflected back out of the tissue into the photodetector. The oxygen saturation of the tissue under the sensor is then calculated. The oxygen saturation measurements are wirelessly transmitted to a remote display device, such as a smartphone running a smartphone software application which receives the measurements and displays them in numeric, graphical, and audible form. In addition, the smartphone software application may relay the data to the Internet for remote viewing on a web site or remote transfer to a hospital patient data system.04-18-2013
20130102863Non-Invasive Trans-Reflective Monitoring Apparatus - Described herein are apparatus, devices and methods of use to monitor a patient's condition. The apparatus includes a housing having an internal volume divided into a first and second cavity by a central opaque partition; a light source positioned within the first cavity and coupled to a first side of the partition; a detector positioned within the second cavity and coupled to a second side of the partition; and a lens material filling the internal volume of the housing and enclosing the first and second cavities. The light source includes a first light emitting diode configured to emit a first wavelength of light and a second light emitting diode configured to emit a second wavelength that is different from the first wavelength of light. The detector is configured to measure at least one of an absorbance, a scattering or a frequency of the first and second wavelengths of light.04-25-2013
20130123592SYSTEMS AND METHODS FOR DETERMINING PHYSIOLOGICAL PARAMETERS USING MEASURED ANALYTE VALUES - Systems and methods for determining a physiological parameter in a patient are provided. In certain embodiments, a system can include an analyte detection system configured to measure first analyte data in a fluid sample received from a patient, a medical sensor configured to measure second analyte data in the patient, and a processor configured to receive the first analyte data and the second analyte data and to determine a physiological parameter based at least in part on the first analyte data and the second analyte data. In certain such embodiments, the medical sensor may be a pulse oximeter, and the physiological parameter may include a cardiovascular parameter including, for example, cardiac output.05-16-2013
20100280344MEDICAL SENSOR FOR REDUCING MOTION ARTIFACTS AND TECHNIQUE FOR USING THE SAME - A sensor may be adapted to reduce motion artifacts by damping the effects of outside forces and sensor motion. A sensor is provided with a motion damping structure adapted to reduce the effect of motion of a sensor emitter and/or detector. Further, a method of damping outside forces and sensor motion is also provided.11-04-2010
20080200785Device for Continuous, Non-invasive Measurement of Arterial Blood Pressure and Uses Thereof - The invention relates to methods and devices for continuous, non-invasive measurement of arterial blood pressure. One embodiment of the invention as illustrated in FIG. 08-21-2008
20110213227WIRELESS MEDICAL MONITORING SYSTEM - A blood oxygen saturation level (SpO2) measurement subunit employed in a wireless transceiver unit connected to a medical monitor unit. An illumination emulator is used for emulating the characteristics of an illumination source of a pulse oximeter. The emulator utilities at least part of the energy coming from the SpO2 socket of the medical monitor. Energy originally intended to energize one illumination source of the pulse oximeter, energizes the power supply circuitry. A processor is employed for processing information about pulsing arterial blood of a patient received from a patient companion assembly (PCA). A digital to analogue converter is used for converting the PCA, to analogue signal. A low pass filter (LPF), filtering the signal to form a pulsative voltage signal represents the pulsing arterial blood of the patient, and is sent to the SpO2 socket of the medical monitor for displaying and further processing.09-01-2011
20110213226MOTION COMPENSATION IN A SENSOR - A system and method for compensating for movement in a sensor. A sensor may include an emitter configured to transmit light, a detector configured to receive the transmitted light via a respective light path, and an accelerometer configured to measure a change in distance between the detector and the emitter. The sensor may transmit the measurements relating to the change in distance between the detector and the emitter to a pulse oximetry monitor. The pulse oximetry monitor may generate an attenuation factor corresponding to the change in the distance between the detector and the emitter that may be used to compensate for movement in a sensor when calculating physiological parameters of a patient.09-01-2011
20110224517Method, System, and Apparatus for Automatic Detection of Obstructive Sleep Apnea from Oxygen Saturation Recordings - Disclosed embodiments include a method for automatic detection of sleep apnea implemented in a medical apparatus, the method comprising (a) extracting a plurality of signal features by analyzing an oxygen saturation signal, (b) performing dimensionality reduction on the plurality of signal features to generate a plurality of signal features in a transformed space; and (c) displaying a sleep apnea diagnosis result based on a statistical classifier that operates on the plurality of signal features in a transformed space.09-15-2011
20110275914Light Measurement Device - Provided is a light measurement device capable of obtaining reproducible measurement data without the necessity for bringing a subject into the state of performance of a task such as finger movement many times, the measurement data having no variation and less affected by Mayer Wave and the like caused by respiration, blood pressure, and the like other than the performance of the task. Specifically provided is a light measurement device (11-10-2011
20110237911MULTIPLE-WAVELENGTH PHYSIOLOGICAL MONITOR - A physiological monitor for determining blood oxygen saturation of a medical patient includes a sensor, a signal processor and a display. The sensor includes at least three light emitting diodes. Each light emitting diode is adapted to emit light of a different wavelength. The sensor also includes a detector, where the detector is adapted to receive light from the three light emitting diodes after being attenuated by tissue. The detector generates an output signal based at least in part upon the received light. The signal processor determines blood oxygen saturation based at least upon the output signal, and the display provides an indication of the blood oxygen saturation.09-29-2011
20130150686Human Care Sentry System - Disclosed is a process and composition of matter to support safe, assisted, independent living. The process is to create ubiquitous monitoring of the invention user's activities, physiology, and environment; analyze information from monitoring and sensing devices; and act on the information in a prioritized manner to address emergent events, and potentially undesirable conditions. The invention uses a software architecture and schema called Adaptive Scalable Plug&play Infrastructure for Responsive Engineering (ASPIRE).06-13-2013
20100317943Active Noise Cancellation in an Optical Sensor Signal - A medical device system and associated method are used for monitoring tissue oxygenation. An optical sensor produces a signal corresponding to tissue light attenuation. A processor receives the optical sensor signal and computes a first measure of light attenuation at a first light wavelength and a second measure of light attenuation at a second light wavelength. In one embodiment, noise cancellation circuitry receives the first measure and the second measure and generates a guessed ratio of the first and second measures. Using the first measure, the second measure and the guessed ratio, the noise cancellation circuitry provides a peak output power when the guessed ratio corresponds to an actual ratio of the first and second measures.12-16-2010
20100317942Tissue Oxygenation Monitoring in Heart Failure - A medical device system and associated method are used for monitoring a heart failure patient. A medical device for monitoring delivery of a therapy includes a sensor sensing an optical sensor signal corresponding to light attenuation by a volume of body tissue of a patient, a therapy delivery module to deliver a therapy, and a processor configured to compute a first tissue oxygenation measurement from the optical sensor signal prior to initiating delivery of the therapy, compute a second tissue oxygenation measurement from the optical sensor signal subsequent to initiating delivery of the therapy, compare the first and the second tissue oxygenation measurements, and determine whether the delivered therapy was successful in response to the first tissue oxygenation measurement and the second tissue oxygenation measurement.12-16-2010
20100317940Absolute calibrated tissue oxygen saturation and total hemoglobin volume fraction - A medical device for monitoring a patient condition includes a sensor capable of being advanced transvascularly to be positioned along a volume of tissue, the sensor including a first combination of a light source and a light detector to emit light into a volume of tissue and to detect light scattered by the volume of tissue and to generate a first output signal corresponding to an intensity of the detected light. A control module is coupled to the light source to control the light source to emit light at least four spaced-apart light wavelengths, and a monitoring module is coupled to the light detector to receive the output signal and compute a measure of tissue oxygenation using the light detector output signal.12-16-2010
20100317939Device and Method for Monitoring of Absolute Oxygen Saturation and Tissue Hemoglobin Concentration - A method and medical device for detecting signals that detects emitted light scattered by a volume of tissue delivered along a first pathway and a second pathway different from the first pathway, detects emitted light scattered by a volume of tissue delivered along a third pathway and a fourth pathway different from the third pathway, determines a first uniformity corresponding to the emitted light detected along the first pathway and the second pathway, determines a second uniformity corresponding to the emitted light detected along third pathway and the fourth pathway, determines a total uniformity in response to the determined first uniformity and the determined second uniformity, and alters sensing by the device in response to the determined total uniformity.12-16-2010
20100317938Device and Method for Monitoring of Absolute Oxygen Saturation and Tissue Hemoglobin Concentration - A method and medical device for detecting signals that detects emitted light scattered by a volume of tissue delivered along a first pathway at a plurality of wavelengths to generate corresponding first detected light intensity output signals, detects emitted light scattered by the volume of tissue delivered along a second pathway different from the first pathway at a plurality of wavelengths to generate corresponding second detected light intensity output signals, determines whether a difference between the emitted light detected along the first pathway and the emitted light detected along the second pathway is greater than a predetermined threshold, and alters sensing by the device in response to the determining whether a difference is greater than the predetermined threshold.12-16-2010
20100317937Device and Method for Monitoring of Absolute Oxygen Saturation and Total Hemoglobin Concentration - A medical device for monitoring of oxygen saturation includes an optical sensor adapted for positioning adjacent to a tissue volume. The optical sensor has a light emitting portion capable of emitting light at a plurality of wavelengths and a light detecting portion capable of generating an electrical output signal corresponding to light incident on the detecting portion. A control module coupled to the optical sensor controls the light emitted by the light emitting portion. A monitoring module receives the output signal from the light detecting portion and computes a volume-independent measure of oxygen saturation in the volume of tissue using the output signal.12-16-2010
20100317936DISPOSABLE COMPONENTS FOR REUSABLE PHYSIOLOGICAL SENSOR - A sensor cartridge according to embodiments of the disclosure is capable of being used with a non-invasive physiological sensor. Certain embodiments of the sensor cartridge protect the sensor from damage, such as damage due to repeated use, reduce the need for sensor sanitization, or both. Further, embodiments of the sensor cartridge are positionable on the user before insertion in the sensor and allow for improved alignment of the treatment site with the sensor. In addition, the sensor cartridge of certain embodiments of the disclosure can be configured to allow a single sensor to comfortably accommodate treatment sites of various sizes such as for both adult and pediatric applications.12-16-2010
20120283533ADJUSTING PARAMETERS USED IN PULSE OXIMETRY ANALYSIS - Adjusting a pulse qualification criterion includes receiving a signal representing a plurality of pulses, where the signal is generated in response to detecting light scattered from blood perfused tissue. A characteristic is determined A pulse qualification criterion used for qualifying a pulse is adjusted in accordance with the characteristic. The pulses are evaluated according to the pulse qualification criterion.11-08-2012
20130184544BODY-MOUNTED PHOTOACOUSTIC SENSOR UNIT FOR SUBJECT MONITORING - A body-mounted photoacoustic sensor unit may use photoacoustic sensing to determine one or more physiological parameters of a subject. The body-mounted photoacoustic sensor unit may fixably locate a light source and photoacoustic detector relative to a target area. The photoacoustic detector may detect an acoustic pressure response generated by the application and absorption of light from the light source.07-18-2013
20080319290Tissue Retractor Oximeter - A retractor has an oximeter sensor at its tip, which allows measuring of oxygen saturation of a tissue being retracted by the retractor. The tip includes one or more openings for at least one source and detector. A specific implementation is a spinal nerve root retractor with an oximeter sensor.12-25-2008
20110313262METHOD AND APPARATUS FOR PREVENTION OF APNEA - Embodiments provide a continuous monitor of a patient's oxygenation and/or respiration coupled to a device configured to stimulate the patient's respiratory drive and/or summon medical assistance. In embodiments, there are provided systems, devices, and methods to assist in preventing patients from overdosing themselves with narcotics post-surgery. In embodiments, an apnea prevention device (APD) may utilize a commercially available pulse oximeter and/or a respiratory monitor to continuously monitor a patient's level of oxygenation/respiration. Should a patient develop respiratory depression or apnea and begin to desaturate, an APD may, using a proprietary method, trigger a sequence of staged responses to reverse worsening hypoxia.12-22-2011
20130190580ANALYZING PHOTON DENSITY WAVES IN A MEDICAL MONITOR - A monitoring system that may include an emission feature capable of emitting light into tissue, a modulator portion capable of modulating the emitter at a modulation frequency to generate photon density waves, a detection portion capable of detecting photons of the photon density waves after propagation through the tissue and capable of providing a distribution of detected photons over a time period for the photon density waves, and an analysis portion capable of calculating a skewness of the distribution and making determinations relating to a value of a physiologic parameter of the tissue based at least in part on the skewness of the distribution.07-25-2013
20110319731METHODS FOR NONINVASIVELY MEASURING ANALYTE LEVELS IN A SUBJECT - A method for noninvasively measuring analytes such as blood glucose levels includes using a non-imaging OCT-based system to scan a two-dimensional area of biological tissue and gather data continuously during the scanning. Structures within the tissue where measured-analyte-induced changes to the OCT data dominate over changes induced by other analytes are identified by focusing on highly localized regions of the data curve produced from the OCT scan which correspond to discontinuities in the OCT data curve. The data from these localized regions then can be related to measured analyte levels.12-29-2011
20130204103MEDICAL DEVICE SYSTEM - The invention provides a medical device system comprising at least two technologies wherein at least one technology is based on bio-impedance measuring and/or at least one technology is based on spectrophotometry measurements wherein software cross analyses the results to assess the homeostasis of an individual. The technologies measure a variety of parameters. In one embodiment the bioimpedance measuring equipment measures in bipolar mode and in tetrapolar mode and the spectophotmeter measuring equipment comprises a pulse oximeter. The system and homeostasis score can be used to determine and monitor therapy for a patient.08-08-2013
20130204105METHOD AND APPARATUS FOR MONITORING A BLOOD OXYGEN SATURATION LEVEL RELATIVE TO A SATURATION THRESHOLD VALUE - A method and apparatus for monitoring a blood oxygen saturation level within a subject's tissue is provided. The method includes the steps of: a) sensing the subject's tissue using a near infrared spectrophotometric oximeter, and producing a value representative of the oxygen saturation level within the sensed tissue; b) comparing the determined saturation value to a predetermined threshold oxygen saturation value; and c) determining at least one of a time under threshold (TUT) value or an area under threshold (AUT) value using the determined saturation value and the threshold value.08-08-2013
20130204104APPARATUS FOR EVALUATING A PATIENT'S HEMODYNAMIC STATUS USING A HEART-LUNG INTERACTION - Apparatus for evaluating a mechanically ventilated patient's hemodynamic status, adapted to provide a respiratory variation diagram of a hemodynamic variable, and being capable of deriving the value of a hemodynamic parameter for each mechanical breath cycle as well as an assessment of its suitability for the hemodynamic analysis on basis of the respiratory variation diagram. A method is also provided.08-08-2013
20120065486DEVICE, SYSTEM AND METHOD FOR MONITORING AND COMMUNICATING BIOMETRIC DATA OF A DIVER - A system and method for monitoring biometric data of a diver and signaling those data from a first communication device to other communication devices, e.g., those of other divers, on a ship or buoy. A signal generated from a device of the diver can generate a diver identifier, an indication of a stress state of the diver and the diver's location.03-15-2012
20120095305Spectrophotometric Monitoring Of Multiple Layer Tissue Structures - Methods, systems, and related computer program products for the non-invasive spectrophotometric monitoring of a biological volume having multiple tissue layers are described. Aggregate absorption and scattering properties are measured for each of a plurality of predetermined source-detector separation distances along a surface of the biological volume, the measurement being based on a model of the biological volume as a single-layer, semi-infinite, homogeneous volume. A predetermined multi-layer tissue model is retrieved that characterizes a mathematical relationship among (a) absorption and scattering properties of each layer of a multi-layer tissue structure, and (b) aggregate absorption and scattering properties of the multi-layer tissue structure as would be measured at selected source-detector separation distances along a surface thereof. The measured aggregate absorption and scattering properties are processed in conjunction with the predetermined multi-layer tissue model to compute therefrom a deep-layer-specific absorption property corresponding to the relatively deep tissue layer.04-19-2012

Patent applications in class Oxygen saturation, e.g., oximeter

Patent applications in all subclasses Oxygen saturation, e.g., oximeter