Patent application number | Description | Published |
20090082651 | Selection of ensemble averaging weights for a pulse oximeter based on signal quality metrics - A method and a system for ensemble averaging signals in a pulse oximeter, including receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light, obtaining an assessment of the signal quality of the electromagnetic signals, selecting weights for an ensemble averager using the assessment of signal quality, and ensemble averaging the electromagnetic signals using the ensemble averager. | 03-26-2009 |
20090171167 | System And Method For Monitor Alarm Management - Embodiments disclosed herein may include a method and system for determining patient-specific alarm thresholds for monitoring the patient's physiological parameters. For example, in an embodiment, the patient's age, weight, height, diagnosis, medications and/or other factors may affect his or her normal heart rate, blood oxygen saturation, and/or other physiological parameters. Accordingly, in an embodiment, information specific to or generally applicable to the patient may be supplied to a monitoring system to enable determination of the appropriate maximum and minimum thresholds. In an embodiment, if the patient exceeds one of the personalized thresholds, the monitoring system may alert a caregiver that there is a problem. | 07-02-2009 |
20090171173 | SYSTEM AND METHOD FOR REDUCING MOTION ARTIFACTS IN A SENSOR - Embodiments disclosed herein may include a patient sensor which has a low-friction exterior coating. In an embodiment, the exterior surface of the sensor may come into contact with external items, such as, for example, bed linens, clothing, unintended parts of the patient's body, or other people. The low-friction coating disposed on the exterior of the sensor may include a material having a relatively low coefficient of friction with respect to these external items. In an embodiment, the low-friction material may include, for example, a fluoropolymer, a polypropylene, or a polyethylene. Additionally, in an embodiment, an internal surface of the sensor that is in contact with the patient may have a relatively high-friction coating, such as an adhesive. In an embodiment, a stack of adhesive layers may be disposed on the internal surface around one or more light emitting and/or detecting optics. | 07-02-2009 |
20090221889 | Pulse Oximeter With Alternate Heart-Rate Determination - A pulse oximeter which determines multiple heart rates, and selects between them based on the metrics of only one of the heart rate calculations. A primary heart rate calculation method is selected, and is used unless its metrics indicate questionable accuracy, in which case an alternative rate calculation is available and is used instead. | 09-03-2009 |
20090240126 | Method And System For Classification of Photo-Plethysmographically Detected Respiratory Effort - Embodiments disclosed herein may include systems and methods for determining a patient's respiratory effort and blood oxygen saturation based on data acquired from a pulse oximetry sensor and analyzing the parameters in conjunction with each other. For example, the respiratory effort may be determined based on a photo-plethysmographic waveform generated from light attenuation detected by the sensor, and the blood oxygen saturation may be a pulse-based estimate of arterial blood oxygen saturation determined from the detected attenuation. Analysis of the parameters may enable detection and classification of apnea (e.g., obstructive or central) or another underlying cause for respiratory instability. Furthermore, the measured respiratory effort may be compared to respiratory effort supplied by a ventilator to ensure proper sensor placement before enabling automatic adjustment of ventilator settings. | 09-24-2009 |
20090241956 | METHOD FOR CONTROLLING DELIVERY OF BREATHING GAS TO A PATIENT USING MULTIPLE VENTILATION PARAMETERS - The disclosure provides a method for controlling the delivery of a breathing gas to a patient. The method may include regulating the fractional inspired oxygen (FiO | 10-01-2009 |
20090241957 | BREATHING ASSISTANCE SYSTEMS WITH LUNG RECRUITMENT MANEUVERS - The disclosure provides a method for controlling the delivery of a breathing gas to a patient including automatic lung recruitment maneuvers. The method may include regulating the FiO | 10-01-2009 |
20090241958 | METHOD FOR SELECTING TARGET SETTINGS IN A MEDICAL DEVICE - The disclosure provides a method for controlling the delivery of a breathing gas to a patient. The method may include regulating the delivery of the breathing gas delivered to the patient, determining a value for a first ventilation parameter, comparing the determined value of the first ventilation parameter to a pre-determined target value for the first ventilation parameter, automatically adjusting the breathing gas delivered to the patient in response to the comparison between the determined value of the first ventilation parameter and the pre-determined target value for the first ventilation parameter, and automatically determining a new target value for the first ventilation parameter based at least in part on the determined value of the first ventilation parameter. | 10-01-2009 |
20090247848 | Reducing 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 |
20090287070 | Estimation Of A Physiological Parameter Using A Neural Network - A neural network is used to combine one or more estimates of a physiologic parameter with one or more associated signal quality metrics, creating a more accurate estimate of said physiologic parameter, as well as a second estimate of the accuracy of said physiologic parameter estimate. | 11-19-2009 |
20090320836 | Method For Regulating Treatment Based On A Medical Device Under Closed-Loop Physiologic Control - Embodiments of the present disclosure are directed to a system and method for automated medical treatment. Specifically, the disclosure is directed to a first controller capable of monitoring a physiological parameter of a patient and supplying the patient with a delivery parameter based at least in part on the physiological parameter to control the physiological parameter. Further, present embodiments include a second controller capable of determining a therapeutic procedure to be performed on the patient based at least in part on analysis of the delivery parameter, and automatically initiating an alert indicative of the therapeutic procedure and/or automatically performing the therapeutic procedure. | 12-31-2009 |
20090326348 | METHOD 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 (SpO | 12-31-2009 |
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 |
20100081944 | Systems and Methods for Recalibrating a Non-Invasive Blood Pressure Monitor - Techniques for non-invasive blood pressure monitoring are disclosed. Data corresponding to a patient may be received from a hospital information system. The data may include, for example, drug administration data, medical procedure data, medical equipment data, or a combination thereof. Whether a blood pressure monitoring system needs to be recalibrated may be determined, based at least in part on the received data. If it is determined that the blood pressure monitoring system needs to be recalibrated, the recalibration may be performed and at least one blood pressure measurement of the patient may be computed using the recalibrated blood pressure monitoring system. | 04-01-2010 |
20100249549 | Indicating 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 |
20100292548 | Method And Apparatus For Detecting And Analyzing Variations In A Physiologic Parameter - The present disclosure is generally directed to identifying and/or analyzing high resolution variations in a measured physiologic parameter, such as blood oxygen saturation (SpO | 11-18-2010 |
20100332173 | SYSTEMS AND METHODS FOR ASSESSING MEASUREMENTS IN PHYSIOLOGICAL MONITORING DEVICES - Methods and systems are provided for deriving and analyzing shape metrics, including skewness metrics, from physiological signals and their derivatives to determine measurement quality, patient status and operating conditions of a physiological measurement device. Such determinations may be used for any number of functions, including indicating to a patient or care provider that the measurement quality is low or unacceptable, alerting a patient or care provider to a change in patient status, triggering or delaying a recalibration of a monitoring device, and adjusting the operating parameters of a monitoring system. | 12-30-2010 |
20110071368 | Medical Device Interface Customization Systems And Methods - Embodiments of the present disclosure relate to customization of user interfaces for medical devices. According to certain embodiments, patient monitors may include a device body designed to interface with interchangeable and removable faceplates. The faceplates may include input devices for controlling the patient monitor. Further, the properties of the input devices, such as the size, shape, labels, type, and location, may vary between faceplates. Further, in certain embodiments, the faceplates may include a memory for storing preferences associated with the user interface. | 03-24-2011 |
20110077470 | Patient Monitor Symmetry Control - Embodiments of the present disclosure relate to customization of user interfaces for medical devices. According to certain embodiments, patient monitors may include a symmetry control feature that adjusts the position of touch sensitive inputs shown on a display of the patient monitor. The symmetry control feature may allow a user to move the touch sensitive inputs from one side of the display to another to allow a user to access the touch sensitive inputs without blocking a portion of the display that displays patient physiological data. Further, in certain embodiments, the symmetry control feature may vary the location of one or more touch sensitive inputs based on user identification information received through a communication interface. | 03-31-2011 |
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 |
20110077547 | Spectroscopic Method And System For Assessing Tissue Temperature - According to various embodiments, a medical system and method for determining tissue temperature may include a spectroscopic sensor. The spectroscopic sensors may be configured to provide information about changes in water absorption profiles at one or more absorption peaks. Such sensors may be incorporated into ablation systems for tissue ablation. Temperature information may be used to determine the scope, volume, and/or depth of the ablation. | 03-31-2011 |
20110092785 | Selection 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 |
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 |
20110152652 | SYSTEM AND METHOD FOR PULSE RATE CALCULATION USING A SCHEME FOR ALTERNATE WEIGHTING - Embodiments of the present invention relate to a method for analyzing pulse data. In one embodiment, the method comprises receiving a signal containing data representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue. Further, one embodiment includes performing a pulse identification or qualification algorithm on at least a portion of the data, the pulse identification or qualification algorithm comprising at least one constant, and modifying the at least one constant based on results obtained from performing the pulse identification or qualification algorithm, wherein the results indicate that a designated number of rejected pulses has been reached. | 06-23-2011 |
20110175728 | Nuisance Alarm Reduction Method For Therapeutic Parameters - This disclosure describes systems and methods for reducing nuisance alarms associated with monitoring non-physiological parameters in a ventilatory system. Non-physiological parameters may include, but are not limited to, parameters that are internally monitored by the ventilator based on pre-configured ranges dictated by the manufacturer, by an applicable protocol, or by the clinician. Embodiments described herein seek to mitigate nuisance alarms by basing alarm conditions, at least in part, on an integral threshold such that an alarm is not generated when a monitored parameter briefly falls outside an acceptable range by a slight degree, but such that an alarm is generated when a monitored parameter falls outside an acceptable range by a more significant magnitude and/or duration. | 07-21-2011 |
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 |
20120108924 | SYSTEM AND METHOD FOR DETECTION OF SKIN WOUNDS AND COMPARTMENT SYNDROMES - A system configured to provide feedback regarding fluid parameters in the skin and/or compartments of an individual to facilitate early diagnosis of skin wounds and compartment syndromes. | 05-03-2012 |
20120123282 | METHOD AND APPARATUS FOR DETECTION OF VENOUS PULSATION - Methods and systems for detecting venous pulsation are provided. In one embodiment, a metric of the pulse shape of one or more plethysmographic signals is derived and the presence of venous pulsation is detected based on the metric of pulse shape. Examples, of metrics of pulse shape include a skew metric and a ratio of a minima-to-maxima time over a pulse period interval. In an exemplary embodiment, the presence of venous pulsation is detected based on a metric of the pulse shape of one or more plethysmographic signals and on a phase comparison of the plethysmographic signals. | 05-17-2012 |
20120165632 | MEDICAL SENSOR FOR REDUCING SIGNAL ARTIFACTS AND TECHNIQUE FOR USING THE SAME - A sensor may be adapted to reduce signal artifacts by deflecting the effects of outside forces and sensor motion. A sensor is provided with a rigid annular structure adapted to reduce the effect of motion of a sensor emitter and/or detector. Further, a method of deflecting or minimizing outside forces and sensor motion is also provided. | 06-28-2012 |
20120220844 | Regional Saturation Using Photoacoustic Technique - Methods and systems are provided for determining the oxygen saturation of a region in a patient's body using photoacoustic spectroscopy techniques. One embodiment includes determining an interrogation region, or a region in a patient to be monitored, and using a photoacoustic sensor to emit modulated light in the interrogation region. The modulated light may be absorbed by different absorbers, such as oxygenated hemoglobin and deoxygenated hemoglobin, in the interrogation region. The absorbed light results in an acoustic response which is detected by the photoacoustic sensor. Based on a non-pulsatile component of the acoustic response, the regional oxygen saturation at the interrogation region is calculated. | 08-30-2012 |
20120310060 | METHOD OF ANALYZING PHOTON DENSITY WAVES IN A MEDICAL MONITOR - A monitoring system may include an emission feature capable of emitting light into tissue, a modulator capable of modulating the emitter at a modulation frequency, e.g., in a range of about 10 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 a processor capable of using phase and amplitude differences of the photon density wave signal relative to a reference to determine one or more physiological parameters. The phase and amplitude differences may be much lower frequency that the modulation rate. Accordingly, these differences may be masked by signal artifacts. Provided herein are signal conditioning techniques that may improve the signal to noise ratio of photon density wave signals and yield a more robust phase and amplitude signal. | 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 |
20130006075 | PHOTOPLETHYSMOGRAPHY FOR DETERMINING VENTILATION WEANING READINESS - Embodiments of the present disclosure relate to a system and method for determining a likelihood of successful ventilator weaning for a patient undergoing mechanical or assisted ventilation. Specifically, embodiments provided herein include methods and systems for determining or predicting weaning readiness in a patient based on physiological parameters determined via photoplethysmography. | 01-03-2013 |
20130109936 | MEDICAL SENSOR AND TECHNIQUE FOR USING THE SAME | 05-02-2013 |
20130123588 | Method and Apparatus for Estimating Water Reserves - A system and method are provided for a water reserve index. The method includes determining a lean water fraction of tissue for at least one tissue site and determining skin thickness for the at least one tissue site. The lean water fraction and skin thickness are combined to produce a water reserve estimate. | 05-16-2013 |
20130131671 | SPECTROSCOPIC METHOD AND SYSTEM FOR ASSESSING TISSUE TEMPERATURE - According to various embodiments, a medical system and method for determining tissue temperature may include a spectroscopic sensor. The spectroscopic sensors may be configured to provide information about changes in water absorption profiles at one or more absorption peaks. Such sensors may be incorporated into ablation systems for tissue ablation. Temperature information may be used to determine the scope, volume, and/or depth of the ablation. | 05-23-2013 |
20130137936 | SYSTEMS AND METHODS FOR DETERMINING RESPIRATION INFORMATION USING HISTORICAL DISTRIBUTION - A patient monitoring system may generate an autocorrelation sequence for a physiological signal such as a photoplethysmograph signal. A series of peak values may be identified for the autocorrelation sequence. The peak values may be modified based on a historical distribution of a physiological parameter. A physiological parameter such as respiration rate may be determined based on the modified peak values. | 05-30-2013 |
20130146056 | METHOD AND SYSTEM FOR CLASSIFICATION OF PHOTO-PLETHYSMOGRAPHICALLY DETECTED RESPIRATORY EFFORT - Embodiments disclosed herein may include systems and methods for determining a patient's respiratory effort and blood oxygen saturation based on data acquired from a pulse oximetry sensor and analyzing the parameters in conjunction with each other. For example, the respiratory effort may be determined based on a photo-plethysmographic waveform generated from light attenuation detected by the sensor, and the blood oxygen saturation may be a pulse-based estimate of arterial blood oxygen saturation determined from the detected attenuation. Analysis of the parameters may enable detection and classification of apnea (e.g., obstructive or central) or another underlying cause for respiratory instability. Furthermore, the measured respiratory effort may be compared to respiratory effort supplied by a ventilator to ensure proper sensor placement before enabling automatic adjustment of ventilator settings. | 06-13-2013 |
20130159912 | NUISANCE ALARM REDUCTION METHOD FOR THERAPEUTIC PARAMETERS - This disclosure describes systems and methods for reducing nuisance alarms associated with monitoring non-physiological parameters in a ventilatory system. Non-physiological parameters may include, but are not limited to, parameters that are internally monitored by the ventilator based on pre-configured ranges dictated by the manufacturer, by an applicable protocol, or by the clinician. Embodiments described herein seek to mitigate nuisance alarms by basing alarm conditions, at least in part, on an integral threshold such that an alarm is not generated when a monitored parameter briefly falls outside an acceptable range by a slight degree, but such that an alarm is generated when a monitored parameter falls outside an acceptable range by a more significant magnitude and/or duration. | 06-20-2013 |
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 |
20130261487 | CARBON DIOXIDE-SENSING AIRWAY PRODUCTS AND TECHNIQUE FOR USING THE SAME - An airway device is provided that may track the flow of respiratory gases through the device with sensing elements at a plurality of locations along the gas flow path of the device. Such a device may be useful for assessing a variety of clinical states, for adjusting patient ventilator settings, or for determining whether or not an airway device has been properly inserted into a patient airway. | 10-03-2013 |
20130324809 | METHODS AND SYSTEMS FOR POWER OPTIMIZATION IN A MEDICAL DEVICE - A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger. | 12-05-2013 |
20130324855 | METHODS AND SYSTEMS FOR POWER OPTIMIZATION IN A MEDICAL DEVICE - A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger. | 12-05-2013 |
20130324856 | METHODS AND SYSTEMS FOR POWER OPTIMIZATION IN A MEDICAL DEVICE - A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger. | 12-05-2013 |
20130331710 | Pathlength Enhancement of Optical Measurement of Physiological Blood Parameters - Systems and methods for measuring a physiological parameter of tissue in a patient are provided herein. In a first example, a method of measuring a physiological parameter of blood in a patient is provided. The method includes emitting at least two optical signals for propagation through tissue of the patient, detecting the optical signals after propagation, identifying propagation pathlengths of the optical signals, and identifying detected intensities of the optical signals. The method also includes processing at least the propagation pathlengths to scale the detected intensities for determination of a value of the physiological parameter. | 12-12-2013 |
20130338514 | METHOD FOR DETERMINING HEMODYNAMIC EFFECTS - The present disclosure relates, in some embodiments, to devices, systems, and/or methods for collecting, processing, and/or displaying stroke volume and/or cardiac output data. For example, a device for assessing changes in cardiac output and/or stroke volume of a subject receiving airway support may comprise a processor; an airway sensor in communication with the processor, wherein the airway sensor is configured and arranged to sense pressure in the subject's airway, lungs, and/or intrapleural space over time; a blood volume sensor in communication with the processor, wherein the blood volume sensor is configured and arranged to sense pulsatile volume of blood in a tissue of the subject over time; and a display configured and arranged to display a representative of an airway pressure, a pulsatile blood volume, a photoplethysmogram, a photoplethysmogram ratio, the determined cardiac output and/or stroke volume, or combinations thereof. A method of assessing changes in cardiac output or stroke volume of a subject receiving airway support from a breathing assistance system may comprise sensing pressure in the subject's airway as a function of time, sensing pulsatile volume of blood in a tissue of the subject as a function of time, producing a photoplethysmogram from the sensed pulsatile volume, determining the ratio of the amplitude of the photoplethysmogram during inhalation to the amplitude of the photoplethysmogram during exhalation, and determining the change in cardiac output or stroke volume of the subject using the determined ratio. | 12-19-2013 |
20140031652 | SELECTION OF ENSEMBLE AVERAGING WEIGHTS FOR A PULSE OXIMETER BASED ON SIGNAL QUALTIY 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. | 01-30-2014 |
20140031653 | MEDICAL SENSOR FOR REDUCING ARTIFACTS AND TECHNIQUE FOR USING THE SAME - A sensor may be adapted to reduce signal artifacts by deflecting the effects of outside forces and sensor motion. A sensor is provided with a rigid annular structure adapted to reduce the effect of motion of a sensor emitter and/or detector. Further, a method of deflecting or minimizing outside forces and sensor motion is also provided. | 01-30-2014 |
20140180046 | METHOD AND SYSTEM FOR MONITORING INTRACRANIAL PRESSURE - Embodiments of the present invention relate to a system and method for monitoring intracranial pressure. Embodiments of the present invention include emitting an electromagnetic wavelength into forehead tissue of a patient and detecting characteristics of the electromagnetic wavelength after the electromagnetic wavelength has been scattered by the tissue. The characteristics may include variations in the electromagnetic wavelength corresponding to a pulse. Further, embodiments of the present invention include analyzing the variations to identify venous pulsations, and determining whether intracranial pressure is elevated in the patient based on a correlation between the venous pulsations and levels of intracranial pressure. | 06-26-2014 |
20140309507 | REDUCING 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. | 10-16-2014 |
20140343437 | SYSTEM AND METHOD FOR PULSE RATE CALCULATION USING A SCHEME FOR ALTERNATE WEIGHTING - Embodiments of the present invention relate to a method for analyzing pulse data. In one embodiment, the method comprises receiving a signal containing data representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue. Further, one embodiment includes performing a pulse identification or qualification algorithm on at least a portion of the data, the pulse identification or qualification algorithm comprising at least one constant, and modifying the at least one constant based on results obtained from performing the pulse identification or qualification algorithm, wherein the results indicate that a designated number of rejected pulses has been reached. | 11-20-2014 |