Patent application number | Description | Published |
20100013642 | Systems And Methods For Evaluating A Physiological Condition - A method and system are provided for evaluating in patient monitoring whether a signal is sensed optimally by receiving a signal, transforming the signal using a wavelet transform, generating a scalogram based at least in part on the transformed signal, identifying a pulse band in the scalogram, identifying a characteristic of the pulse band, determining, based on the characteristic of the pulse band, whether the signal is sensed optimally; and triggering an event. The characteristics of the pulse band and scalogram may be used to provide an indication of monitoring conditions. | 01-21-2010 |
20100016680 | Signal Processing Systems and Methods for Analyzing Multiparameter Spaces to Determine Physiological States - The present disclosure relates to signal processing systems and methods, and more particularly, to systems and methods for analyzing multiparameter spaces to determine changes in a physiological state. In embodiments, a first signal and a second signal may be obtained, from which a first plurality of values of a physiological parameter may be determined. At least one of the signals also may be used to generate a scalogram derived at least in part from the signal. A second plurality of values may be determined based at least in part on a feature in the scalogram. The first and second plurality of values may then be associated, and a physiological state may be analyzed using the associated first and second values. In an embodiment, the signals may be PPG signals and the associated first and second values may include a parameter scatter plot that may permit a user to determine changes in a patient's ventilation state over time. | 01-21-2010 |
20100017142 | Low Perfusion Signal Processing Systems And Methods - In some embodiments, systems and methods for identifying a low perfusion condition are provided by transforming a signal using a wavelet transform to generate a scalogram. A pulse band and adjacent marker regions in the scalogram are identified. Characteristics of the marker regions are used to detect the existence of a lower perfusion condition. If such a condition is detected, an event may be triggered, such as an alert or notification. | 01-21-2010 |
20100081897 | Transmission Mode Photon Density Wave System And Method - Present embodiments are directed to a monitor system, such as a pulse oximetry system. The system may include a detection feature, an emission feature capable of emitting light into tissue and arranged relative to the detection feature such that the detection feature is capable of detecting the light from the tissue after passing generally through a portion of the tissue, a modulator capable of modulating the light to generate photon density waves at a modulation frequency generally in a range of 50 MHz to 3 GHz, a detector communicatively coupled with the detection feature, wherein the detector is capable of detecting characteristics of the photon density waves comprising amplitude changes and phase shifts, and a processor capable of making determinations relating to a value of a physiologic parameter of the tissue based at least in part on the detected characteristics. | 04-01-2010 |
20100081899 | System and Method for Photon Density Wave Pulse Oximetry and Pulse Hemometry - Present embodiments are directed to a system and method capable of modulating light at a modulation frequency, wherein the modulation frequency is somewhere above about 50 MHz and below about 3 GHz, to generate photon density waves in a medium, detecting relative amplitude changes and phase shifts in the photon density waves, and detecting and graphically indicating a physiologic value related to scattering particles in the medium based on the phase shifts. | 04-01-2010 |
20100081902 | Medical Sensor and Technique for Using the Same - According to embodiments, a medical sensor may be configured for use on mucosal tissue. Such a sensor may include a portion that facilitate the application of the sensor to the tissue and a portion that includes the optical components of the sensor. The two portions of the sensor may be reversibly coupled to one another. In embodiments, such sensors may be used to determine patient hematocrit. | 04-01-2010 |
20100081912 | Ultrasound-Optical Doppler Hemometer and Technique for Using the Same - According to embodiments, a sensor assembly and/or systems for ultrasound-optical measurements may provide information related to hemodynamic parameters. An ultrasound beam may be used to generate a Doppler field for optical elements of a sensor assembly. By combining information received from ultrasound and optical elements of the sensor assembly, more accurate values for hemodynamic parameters may be determined. | 04-01-2010 |
20100081940 | Laser Self-Mixing Sensors for Biological Sensing - According to embodiments, systems, devices, and methods for biological sensing with laser self-mixing sensors are disclosed. In one embodiment, one or more self-mixed laser Doppler signals may be used to detect blood flow velocity or blood vessel wall velocity. In one embodiment, a blood vessel wall compliance may be derived from the blood vessel wall velocity. In one embodiment, blood pressure may be calculated based at least in part on blood flow velocity or based at least in part on blood flow velocity and blood vessel compliance. In one embodiment, common mode noise may be removed from one or more laser signals. | 04-01-2010 |
20100081960 | Bioimpedance System and Sensor and Technique for Using the Same - A sensor assembly and/or systems for bioimpedance measurements may provide information related to the lean body water of the patient's tissue. The information related to the patient's lean body water may be determined by spectroscopic methods for determining water fraction. The patient's fat-free hydration levels may be incorporated into determinations of physiological parameters that may be determined by bioimpedance, such as cardiac output, hemtocrit, or body fat percentage. | 04-01-2010 |
20100249554 | MEDICAL SENSOR WITH COMPRESSIBLE LIGHT BARRIER AND TECHNIQUE FOR USING THE SAME - According to various embodiments, a medical sensor assembly may include compressible light barriers configured to prevent undesired light from being detected. The compressible light barriers may protrude from the surface of the sensor. However, when applied to the tissue, the compressible light barriers may be compressed to the point of being substantially flush with the tissue. | 09-30-2010 |
20100249557 | MEDICAL SENSOR WITH FLEXIBLE COMPONENTS AND TECHNIQUE FOR USING THE SAME - According to various embodiments, a hat-based or headband sensor assembly may include thin or flexible optical sensing components, such as optical fibers or ultra thin emitters or detectors. In embodiments, the sensor assembly may be a hat-based sensor that includes a gripping region, for example on the inside of the hat band, to help secure the hat to a patient's head. | 09-30-2010 |
20110034783 | SYSTEMS AND METHODS FOR BALANCING POWER CONSUMPTION AND UTILITY OF WIRELESS MEDICAL SENSORS - Systems, methods, and devices for balancing power consumption and utility of medical sensors are provided. For example, a wireless medical sensor device may include a sensor, data processing circuitry, and wireless transmission circuitry. The sensor may be capable of obtaining a raw measurement from a patient, and the data processing circuitry may be capable of sampling the raw measurement to obtain values. Further, the data processing circuitry also may be capable of determining an update interval based at least in part on an update factor associated with a status of the patient, and the wireless transmission circuitry may be capable of wirelessly transmitting one of the values to an external wireless receiver at the update interval. | 02-10-2011 |
20110041849 | SYSTEMS AND METHODS FOR CONTROLLING A VENTILATOR - A method and system for controlling a ventilator is disclosed. Oxygen saturation values from pulse oximeters may be used to adjust the settings of a ventilator. Multiple sensors and multiple oxygen saturation values in a fault tolerant pulse oximeter configuration may be used to provide a backup value or confidence measure, thereby increasing reliability and patient safety. | 02-24-2011 |
20110046461 | NANOFIBER 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 |
20110071366 | Determination Of A Physiological Parameter - Methods and systems are provided for transmitting and receiving photon density waves to and from tissue, and processing the received waves using wavelet transforms to identify non-physiological signal components and/or identify physiological conditions. A pulse oximeter may receive the photon density waves from the tissue to generate a signal having phase and amplitude information. A phase signal may be proportional to a scattering by total particles in the tissue, and an amplitude signal may correlate to an absorption by certain particles, providing information on a ratio of different particles in the tissue. Processing the phase and amplitude signals with wavelet transforms may enable an analysis of signals with respect to time, frequency, and magnitude, and may produce various physiological data. For example, non-physiological noise components may be identified, and certain physiological conditions may be identified by processing scalograms of the original signals with patterns corresponding to certain physiological conditions. | 03-24-2011 |
20110071371 | Wavelength-Division Multiplexing In A Multi-Wavelength Photon Density Wave System - Multi-wavelength photon density wave medical systems, methods, and devices are provided. In one embodiment, a multi-wavelength photon density wave patient monitor includes multiple light sources, a driving circuit, a fiber coupler, a sensor cable connector, a wavelength demultiplexer, detectors, and data processing circuitry. The driving circuit may modulate the light sources to produce several single-wavelength input photon density wave signals, which the fiber coupler may join into a multi-wavelength input signal. The sensor cable connector may provide this multi-wavelength input signal to a sensor attached to the patient and receive a multi-wavelength output signal. The wavelength demultiplexer may separate the multi-wavelength output signal into single-wavelength output signals for detection by the detectors. Based on a comparison of one of the single-wavelength output signals to a corresponding one of the single-wavelength input signals, the data processing circuitry may determine a physiological parameter of the patient. | 03-24-2011 |
20110071373 | Time-Division Multiplexing In A Multi-Wavelength Photon Density Wave System - Multi-wavelength photon density wave medical systems, methods, and devices are provided. In one embodiment, a multi-wavelength system may include a sensor, a sensor cable, and a patient monitor. The sensor may have an emitter output and a detector input configured to pass a multi-wavelength photon density wave input signal into a patient and receive a resulting multi-wavelength photon density wave output signal. The sensor cable may couple to the sensor using two optical cables for transmitting and receiving the multi-wavelength photon density wave signals. The patient monitor may couple to the sensor cable and generate several time-division multiplexed single-wavelength input signals by modulating one or more light sources at a frequency sufficient to produce resolvable photon density waves. By combining the several time-division multiplexed single-wavelength input signals into one of the optical cables of the sensor cable, the patient monitor may generate the multi-wavelength photon density wave input signal. | 03-24-2011 |
20110071376 | Determination Of A Physiological Parameter - Methods and systems are provided for analyzing a physiological signal by applying a continuous wavelet transform on the signal and comparing the wavelet transformation to a library of wavelet signatures corresponding to one or more physiological conditions and/or patient conditions. A pulse oximeter system may relate the wavelet transformation with one or more of the wavelet signatures based on filters and/or thresholds, and may determine that the wavelet transformation indicates that the patient of the physiological signal has a physiological condition indicated by the related wavelet signature. In some embodiments, the pulse oximeter system may use previous analyses in a neural network to update the library. Further, non-physiological components of the wavelet transformation may also be identified and removed. | 03-24-2011 |
20110071378 | Signal Processing Warping Technique - Methods and systems are provided for using time-frequency warping to analyze a physiological signal. One embodiment includes applying a warping operator to the physiological signal based on the energy density of the signal. The warped physiological signal may be analyzed to determine whether non-physiological signal components are present. Further, the same warping operator may be applied to signal quality indicators, and the warped physiological signal may be analyzed based on the warped signal quality indicators. Non-physiological signal components, or types of non-physiological noise sources, may be identified based on a comparison of the physiological signal with the signal quality indicators. Non-physiological signal components may also be identified based on a neural network of known noise functions. In some embodiments, the non-physiological signal components may be removed to increase accuracy in estimating physiological parameters. | 03-24-2011 |
20110071598 | Photoacoustic Spectroscopy Method And System To Discern Sepsis From Shock - According to various embodiments, a medical system and method for determining a microcirculation parameter of a patient may include a photoacoustic sensor. Specifically, a signal from a photoacoustic sensor may be used to determine if a patient is likely to have sepsis or shock. Although sepsis and shock present similarly with regard to many patient parameters, they may be differentiated by characteristic microcirculation changes. | 03-24-2011 |
20110077485 | Method Of Analyzing Photon Density Waves In A Medical Monitor - A monitoring system that may include an emission feature capable of emitting light into tissue, a modulator capable of modulating the emitter at a modulation frequency generally in a range of about 50 MHz to 3.0 GHz to generate resolvable photon density waves, a detection feature capable of detecting photons of the photon density waves after passage through the tissue and capable of providing a distribution of detected photons over a time period for the photon density waves, and a processor 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. | 03-31-2011 |
20110112379 | SYSTEMS AND METHODS FOR PROVIDING SENSOR ARRAYS FOR DETECTING PHYSIOLOGICAL CHARACTERISTICS - Systems and methods for determining physiological parameters of a subject using a sensor array. In an embodiment, a sensor array may contain sensor elements for determining multiple physiological parameters. A combination of sensor elements and the physiological parameters determined may be selected based on signals obtained from the sensor elements of the sensor array. A sensor array may be connected to a monitoring device that may select an optimal sensor element or combination of sensor elements and one or more physiological parameters to be determined. The monitoring device may then determine physiological parameters using the selected combination of sensor elements and display information associated with the parameters on a monitor for use, for example, in monitoring a medical patient. | 05-12-2011 |
20110112382 | SYSTEMS AND METHODS FOR COMBINED PHYSIOLOGICAL SENSORS - Systems and methods are provided for monitoring the physiological state of a subject. One or more physiological parameters of a subject may be determined from a photoplethysmograph (PPG) signal or signals obtained using at least one PPG sensor. In some embodiments, an electrical physiological signal (EPS) sensor may be located in or near a PPG sensor. A sensor configuration including both PPG sensors and EPS sensors may be advantageously used to detect a PPG signal or signals in combination with one or more EPS signal or signals. To reduce potential interference between an EPS sensor and a PPG sensor, fiber-optic input and output lines may be used to transmit optical signals from light generating circuitry and light detecting circuitry. In some embodiments, the generating and detecting circuitry may be located remotely from one another and may further be located remotely from the EPS sensor, PPG sensor, or both. | 05-12-2011 |
20110112387 | SIMULTANEOUS MEASUREMENT OF PULSE AND REGIONAL BLOOD OXYGEN SATURATION - Methods and systems are provided that allow for the simultaneous calculation of pulse and regional blood oxygen saturation. An oximeter system that includes a sensor with a plurality of emitters and detectors may be used to calculate a pulse and/or regional blood oxygen saturation. A plurality of light signals may be emitted from light emitters. A first light signal may be received at a first light detector and a second light signal may be received at a second light detector. A pulse and/or regional blood oxygen saturation value may be calculated based on the received first and/or second light signals. The pulse and regional blood oxygen saturation values may be calculated substantially simultaneously. The calculated pulse and regional blood oxygen saturation values as well as other blood oxygen saturation values may be displayed simultaneously in a preconfigured portion of a display. | 05-12-2011 |
20110118557 | Intelligent User Interface For Medical Monitors - An intelligent learning process for a user interface of a medical monitor is disclosed. The medical monitor may record user statistics and cluster groups based on settings, configurations, and actions captured by the user statistics. The medical monitor may create classes of users based on the groups and then classify users into classes based on the user statistics. The user interface of the monitor may be adapted based on the user's class. In other embodiments, a central station may access user statistics from multiple monitors and adapt a user interface for the monitors based on the statistics. | 05-19-2011 |
20110118573 | Medical 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 |
20110190600 | COMBINED PHYSIOLOGICAL SENSOR SYSTEMS AND METHODS - A combined physiological sensor and methods for detecting one or more physiological characteristics of a subject are provided. The combined sensor (e.g., a forehead sensor) may be used to detect and/or calculate at least one of a pulse blood oxygen saturation level, a regional blood oxygen saturation level, a respiration rate, blood pressure, an electrical physiological signal (EPS), a pulse transit time (PTT), body temperature associated with the subject, a depth of consciousness (DOC) measurement, any other suitable physiological parameter, and any suitable combination thereof. The combined sensor may include a variety of individual sensors, such as electrodes, optical detectors, optical emitters, temperature sensors, and/or other suitable sensors. The sensors may be advantageously positioned in accordance with a number of different geometries. The combined sensor may also be coupled to a monitoring device, which may receive and/or process one or more output signals from the individual sensors to display information about the medical condition of the subject. In addition, several techniques may be employed to prevent or limit interference between the individual sensors and their associated input and/or output signals. | 08-04-2011 |
20110190612 | Continous 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 |
20110213208 | AMBIENT ELECTROMAGNETIC ENERGY HARVESTING WITH WIRELESS SENSORS - A system and method for generating power via harvesting of ambient electromagnetic signals. 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 harvested electromagnetic signals. | 09-01-2011 |
20110213216 | ADAPTIVE WIRELESS BODY NETWORKS - Systems, methods, and devices for obtaining physiological measurements of a patient using an adaptive body network are provided. In one example, a wireless medical sensor may include physiological sensor circuitry, wireless transceiver circuitry, and control circuitry. The physiological sensor circuitry may be capable of obtaining a physiological measurement of a patient. The wireless transceiver circuitry may be capable of joining a wireless web that includes at least one other wireless medical sensor, through which the wireless transceiver circuitry may communicate the physiological measurement to an external device. The control circuitry may be capable of determining a data update rate at which to operate the physiological sensor or the wireless transceiver circuitry, or a combination thereof, based at least in part on a status of the patient. | 09-01-2011 |
20110213217 | ENERGY OPTIMIZED SENSING TECHNIQUES - The present disclosure describes an energy efficient wireless medical sensor that may be capable of optimizing battery life and increasing component life by selectively using only a subset of the sensors and sensor functionality included in the wireless medical sensor at any one time. One or more update factors may be used by the wireless sensor or an external patient monitor to derive a data collection modality, data collection rates, and update interval. The data collection modality, data collection rates, and update interval may be used to selectively gather sensing data in a manner that is more energy efficient. | 09-01-2011 |
20110213226 | MOTION 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 |
20110242532 | BIODEGRADABLE FIBERS FOR SENSING - Biodegradable waveguides and their uses with devices, such as medical devices, are described. In one embodiment, an optically transmissive fibrous structure comprising biodegradable fiber waveguides may be disposed on a surface of a bandage. The bandage in combination with the optically transmissive fibrous structure may allow for simultaneously monitoring and covering an injured area of a patient. In one embodiment, the fiber waveguides may be provided as multi-channel/multi-core biodegradable fiber waveguides for transmitting light to and from a patient tissue. In some implementations, the bandage may include hydrogel-based biodegradable fiber waveguides that may deliver therapeutics to an injured patient area. | 10-06-2011 |
20110245622 | SYSTEM AND METHOD FOR DETERMINING SENSOR PLACEMENT - Systems, methods, and devices for determining whether a medical sensor has been properly applied to a patient are provided. In one embodiment, a patient monitor having such capabilities may include a medical sensor interface and data processing circuitry. The medical sensor interface may receive physiological data from a medical sensor applied to a patient. The data processing circuitry may be capable of being trained, using a learning-based algorithm, to determine whether the received physiological data indicates that the medical sensor has been properly applied to the patient. | 10-06-2011 |
20110245628 | Photoplethysmograph Filtering Using Empirical Mode Decomposition - Present embodiments relate to systems, methods, and devices for decomposing a physiological signal of a patient using empirical mode decomposition (EMD). In one embodiment, the EMD algorithm may involve identifying a frequency component, referred to as an intrinsic mode function, in the physiological signal. The physiological signal may be decomposed into one or more intrinsic mode functions through multiple iterations of the EMD algorithm. Each subsequent mode function may have a different frequency component of the original physiological signal input into the EMD algorithm. In some embodiments, each mode function may be further analyzed and/or processed to determine various physiological data corresponding to blood flow in the patient. | 10-06-2011 |
20110245636 | Multi-Wavelength Photon Density Wave System Using An Optical Switch - Multi-wavelength photon density wave (PDW) medical systems, methods, and devices are provided. In one embodiment, a multi-wavelength system may include a sensor, a sensor cable, and a patient monitor. The sensor may have an emitter and a detector configured to pass a multi-wavelength PDW input signal into a patient and receive a resulting multi-wavelength PDW output signal. The sensor cable may couple to the sensor and include two optical cables for transmitting and receiving the multi-wavelength PDW signals. The patient monitor may couple to the sensor cable and generate several single-wavelength PDW input signals by modulating a plurality of light sources. The monitor may include an optical switch configured to time-division multiplex the several single-wavelength PDW wave input signals by selecting one of the single-wavelength PDW signals at one time to produce a multi-wavelength PDW signal which is output from the monitor to the sensor via the sensor cable. | 10-06-2011 |
20110245637 | AMBIENT LIGHT USE IN PHYSIOLOGICAL SENSORS - The present disclosure describes the harvesting and use of ambient light in spectrophotometric systems so as to increase the energy efficiency of the systems. In one embodiment, the collected ambient light is filtered and/or converted into discrete wavelengths of light that can then be used in spectrophotometric applications. In one embodiment, the emitted light can then be collected and analyzed to derive various physiological parameters. In certain embodiments, the ambient light may be used in place of light that is electrically generated. | 10-06-2011 |
20110245638 | THERMOELECTRIC 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 |
20110270043 | AIR MOVEMENT ENERGY HARVESTING WITH WIRELESS SENSORS - A system and method for generating power when one or more motion sensitive structures are moved via airflow. 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 the one or more motion sensitive structures when acted upon by airflow. | 11-03-2011 |
20110307184 | LOW PERFUSION SIGNAL PROCESSING SYSTEMS AND METHODS - In some embodiments, systems and methods for identifying a low perfusion condition are provided by transforming a signal using a wavelet transform to generate a scalogram. A pulse band and adjacent marker regions in the scalogram are identified. Characteristics of the marker regions are used to detect the existence of a lower perfusion condition. If such a condition is detected, an event may be triggered, such as an alert or notification. | 12-15-2011 |
20120029829 | Light Focusing Continuous Wave Photoacoustic Spectroscopy And Its Applications To Patient Monitoring - The present disclosure describes systems and methods that use spatial modulation to focus continuous wave light into a localized region of interest such as an individual blood vessel. In certain embodiments, intensity modulation techniques, such as linear frequency modulation, are used in conjunction with spatial modulation to achieve more precise measurements through otherwise scattering medium. The focused beam of continuous wave light is capable of penetrating several centimeters of tissue to deliver measurements and images associated with individual blood vessels and other discrete vascular components. | 02-02-2012 |
20120071739 | WAVELENGTH 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 |
20120113411 | OPTICAL FIBER SENSORS - The present disclosure describes the use and the manufacture of a fiber optic sensor having an angled terminal portion of a fiber optic element. In one embodiment, an optical fiber is cut at an angle and a portion of the fiber's jacket is removed near the angle so that the cladding is exposed. Light may then travel through the fiber, reflect off the angled portion, and emit through the exposed cladding into a patient. Light may also be collected from the patient using the same or a different fiber optic element having an angled terminal portion. In one embodiment, the emitted light can then be collected and analyzed to derive various physiological parameters. In certain embodiments, the fiber optic sensor may be used in environments where metallic and/or electronic sensors are not suitable. | 05-10-2012 |
20120136227 | ORGANIC LIGHT EMITTING DIODES AND PHOTODETECTORS - 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 be selectively detected at a detector. Based on material characteristic of the detector, specific wavelengths of light are detected by the detector for use in monitoring the physiological parameters of the patient. | 05-31-2012 |
20120136261 | Systems and methods for calibrating physiological signals with multiple techniques - Systems and methods are disclosed herein for calibrating the calculation of physiological parameters. Two or more calibration techniques may be used to determine a relationship between physiological measurements and a desired physiological parameter, such as a relationship between differential pulse transit time (DPTT) and blood pressure. Different calibration techniques may be used in a serial fashion, one after the other, or in a parallel fashion, with different weights accorded to each calibration technique. When physiological or other changes occur, the calibration data may be stored for later use and new calibration data may be generated. | 05-31-2012 |
20120197133 | Advanced Ultrasound Modulated Optical Spectroscopy And Its Application To Patient Monitoring - The present disclosure describes systems and methods that use spatial modulation to focus light into a localized region of interest such as an individual blood vessel. In certain embodiments, acoustic modulation techniques, such as ultrasound pulse modulation, are used in conjunction with spatial modulation to achieve more precise measurements through otherwise scattering medium. The focused beam of light is capable of penetrating several centimeters of tissue to deliver measurements and images associated with individual blood vessels and other discrete vascular components. | 08-02-2012 |
20120203087 | SYSTEMS AND METHODS FOR MONITORING DEPTH OF CONSCIOUSNESS - During patient monitoring, a depth of consciousness (DOC) measure, such as a bispectral index, may be used in conjunction with additional information obtained from an awareness metric derived from one or more physiological signals, such as a photoplethysmograph signal. In an embodiment, a DOC measure may be combined with information from an awareness metric to produce a combined DOC measure. In an embodiment, information from an awareness metric derived from one or more physiological signals may be used to provide an indication of confidence in a DOC measure. In an embodiment, a DOC measure may be used to provide an indication of confidence in a depth of consciousness assessment based on an awareness metric. In an embodiment, one or the other of a DOC measure and an awareness metric may be used to provide an indication of a patient's depth of consciousness (e.g., by one “overriding” the other). | 08-09-2012 |
20120310058 | PHOTON DENSITY WAVE BASED DETERMINATION OF PHYSIOLOGICAL BLOOD PARAMETERS - A system for measuring a physiological parameter of blood in a patient is presented. The system includes a transmission module configured to emit a plurality of photon density waves into tissue of the patient from a plurality of modulated light sources. The system also includes a receiver module configured to detect characteristics of the plurality of photon density waves. The system also includes a processing module configured to identify characteristics of a pulsatile perturbation of the tissue based on the characteristics of the plurality of photon density waves, and identify a value of the physiological parameter based on at least the characteristics of the pulsatile perturbation of the tissue and the characteristics of the plurality of photon density waves. | 12-06-2012 |
20120310062 | PHOTON DENSITY WAVE BASED DETERMINATION OF PHYSIOLOGICAL BLOOD PARAMETERS - A method for measuring a physiological parameter of blood in a patient is presented. The method includes emitting light from a modulated light source into tissue of the patient to generate a photon density wave in the tissue, detecting the photon density wave during pulsatile perturbation of the tissue, and processing an amplitude and phase of the photon density wave over the pulsatile perturbation to determine a value of the physiological parameter. | 12-06-2012 |
20130138357 | SYSTEMS AND METHODS FOR EVALUATING A PHYSIOLOGICAL CONDITION - A method and system are provided for evaluating in patient monitoring whether a signal is sensed optimally by receiving a signal, transforming the signal using a wavelet transform, generating a scalogram based at least in part on the transformed signal, identifying a pulse band in the scalogram, identifying a characteristic of the pulse band, determining, based on the characteristic of the pulse band, whether the signal is sensed optimally; and triggering an event. The characteristics of the pulse band and scalogram may be used to provide an indication of monitoring conditions. | 05-30-2013 |
20130190580 | ANALYZING 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 |
20130197331 | PHOTON DENSITY WAVE PULSE OXIMETRY AND PULSE HEMOMETRY - Present embodiments are directed to a system and method capable of modulating light to at least one modulation frequency selected based on at least one blood parameter of a medium being monitored to generate photon density waves in a medium, detecting relative amplitude changes and phase shifts in the photon density waves, and determining at least one blood parameter related to scattering particles in the medium based on the phase shifts. | 08-01-2013 |
20130217988 | MOTION COMPENSATION IN A SENSOR - A physiological sensor includes an emitter configured to transmit light and a detector configured to receive the transmitted light. The sensor also includes a first accelerometer disposed on a first portion of the sensor and a second accelerometer disposed on a second portion of the sensor, the second portion opposing the first portion. The first and second accelerometers are configured to measure a change in motion that corresponds to a change in distance between the detector and the emitter. | 08-22-2013 |
20130253310 | MEDICAL DEVICE AND TECHNIQUE FOR USING THE SAME - According to various embodiments, a tracheal tube may employ optical sensing techniques for determining a distance between the inserted tube and an anatomical structure such as a carina. The distance information may provide an indication as to whether or not the tracheal tube is properly placed within the trachea. The optical techniques may include interferometry. | 09-26-2013 |
20130253311 | TIME OF FLIGHT BASED TRACHEAL TUBE PLACEMENT SYSTEM AND METHOD - According to various embodiments, a tracheal tube may employ optical sensing techniques for determining a distance between the inserted tube and an anatomical structure, such as a carina. The distance information may provide an indication as to whether or not the tracheal tube is properly placed within the trachea. The optical techniques may include time of flight techniques. | 09-26-2013 |
20130282296 | LOW PERFUSION SIGNAL PROCESSING SYSTEMS AND METHODS - In some embodiments, systems and methods for identifying a low perfusion condition are provided by transforming a signal using a wavelet transform to generate a scalogram. A pulse band and adjacent marker regions in the scalogram are identified. Characteristics of the marker regions are used to detect the existence of a lower perfusion condition. If such a condition is detected, an event may be triggered, such as an alert or notification. | 10-24-2013 |
20130317330 | MEDICAL SENSOR WITH COMPRESSIBLE LIGHT BARRIER AND TECHNIQUE FOR USING THE SAME - According to various embodiments, a medical sensor assembly may include compressible light barriers configured to prevent undesired light from being detected. The compressible light barriers may protrude from the surface of the sensor. However, when applied to the tissue, the compressible light barriers may be compressed to the point of being substantially flush with the tissue. | 11-28-2013 |
20140073886 | SIMULTANEOUS MEASUREMENT OF PULSE AND REGIONAL BLOOD OXYGEN SATURATION - Methods and systems are provided that allow for the simultaneous calculation of pulse and regional blood oxygen saturation. An oximeter system that includes a sensor with a plurality of emitters and detectors may be used to calculate a pulse and/or regional blood oxygen saturation. A plurality of light signals may be emitted from light emitters. A first light signal may be received at a first light detector and a second light signal may be received at a second light detector. A pulse and/or regional blood oxygen saturation value may be calculated based on the received first and/or second light signals. The pulse and regional blood oxygen saturation values may be calculated substantially simultaneously. The calculated pulse and regional blood oxygen saturation values as well as other blood oxygen saturation values may be displayed simultaneously in a preconfigured portion of a display. | 03-13-2014 |
20140083426 | SYSTEMS AND METHODS FOR CONTROLLING A VENTILATOR - A method and system for controlling a ventilator is disclosed. Oxygen saturation values from pulse oximeters may be used to adjust the settings of a ventilator. Multiple sensors and multiple oxygen saturation values in a fault tolerant pulse oximeter configuration may be used to provide a backup value or confidence measure, thereby increasing reliability and patient safety. | 03-27-2014 |
20140155715 | WAVELENGTH 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. | 06-05-2014 |
20140378795 | DETERMINATION OF A PHYSIOLOGICAL PARAMETER - Methods and systems are provided for analyzing a physiological signal by applying a continuous wavelet transform on the signal and comparing the wavelet transformation to a library of wavelet signatures corresponding to one or more physiological conditions and/or patient conditions. A pulse oximeter system may relate the wavelet transformation with one or more of the wavelet signatures based on filters and/or thresholds, and may determine that the wavelet transformation indicates that the patient of the physiological signal has a physiological condition indicated by the related wavelet signature. In some embodiments, the pulse oximeter system may use previous analyses in a neural network to update the library. Further, non-physiological components of the wavelet transformation may also be identified and removed. | 12-25-2014 |