Detects Constituents While Excluding Components (e.g., Noise) Patents (Class 600/336)
  • Patent number: 11311237
    Abstract: In some embodiments, a system comprises a wearable member configured to receive first energy, generate first signals, select a first subset of the time series data, determine a standard deviation indicating a quality at a low percentile of values associated with first windows of the time series data and a high percentile of values associated with the first windows of the time series data, the signal assessment threshold being including at least the values of the lower percentile, receive second energy, generate second signals containing second time series data from the second energy, select a second subset of the time series data to assess, compare all or part of the second signals to the signal assessment threshold, and if all or part of the second signals include the second time series data that is within the values of the lower percentile, then remove the second signals from further processing.
    Type: Grant
    Filed: January 28, 2020
    Date of Patent: April 26, 2022
    Inventors: Elad Ferber, Andrew Joseph DeKelaita, Patrick Edward Landreman
  • Patent number: 11219391
    Abstract: A pulse oximeter may reduce power consumption in the absence of overriding conditions. Various sampling mechanisms may be used individually or in combination. Various parameters may be monitored to trigger or override a reduced power consumption state. In this manner, a pulse oximeter can lower power consumption without sacrificing performance during, for example, high noise conditions or oxygen desaturations.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: January 11, 2022
    Assignee: MASIMO CORPORATION
    Inventor: Ammar Al-Ali
  • Patent number: 11202582
    Abstract: The present invention relates to a device (10), system (1) and method (200) for use in blood oxygen saturation measurement of a subject.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: December 21, 2021
    Assignee: Koninklijke Philips N.V.
    Inventors: Willem Verkruijsse, Simone Cornelia Maria Anna Ordelman, Cristian Nicolae Presura, Rick Bezemer, Calina Ciuhu
  • Patent number: 10980485
    Abstract: A measuring apparatus as an aspect of the present invention includes: a first signal acquirer that acquires a pulse wave signal of a living body; a second signal acquirer that acquires a body motion signal of the living body; a frequency analyzer that converts the pulse wave signal and the body motion signal to a frequency domain to generate frequency domain signals, and estimates a frequency of a pulse wave of the living body on the basis of the frequency domain signals; and a time domain analyzer that calculates biological information about the living body on the basis of the frequency.
    Type: Grant
    Filed: September 14, 2017
    Date of Patent: April 20, 2021
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuhiro Kanishima, Takashi Sudo
  • Patent number: 10945618
    Abstract: Methods and apparatus for monitoring a subject are described. A monitoring device configured to be attached to a body of a subject includes a sensor that is configured to detect and/or measure physiological information from the subject and at least one motion sensor configured to detect and/or measure subject motion information. The physiological sensor and motion sensor are in communication with a processor that is configured to receive and analyze signals produced by the physiological sensor and motion sensor. The processor is configured to process motion sensor signals to identify an activity characteristic of the subject.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: March 16, 2021
    Assignee: Valencell, Inc.
    Inventors: Michael Edward Aumer, Steven Francis LeBoeuf
  • Patent number: 10898122
    Abstract: A system for measuring and monitoring physiologically relevant motion of a subject includes at least a motion sensor to measure movement of the subject and produce a series of movement data representing the movement of the subject over a period of time. The system also includes at least a biometric sensor to simultaneously measure biometrics of the subject and produce a series of biometric values of the subject over the period of time. The system is configured to determine a noise-to-signal ratio for the series of movement data as a function of biometric intervals in the series of biometric values and identify at least a portion of the series of movement data as corresponding to a physiologically relevant biorhythm. The system can be used to diagnose and monitor a disease or disorder, including a neurological disorder or a traumatic brain injury.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: January 26, 2021
    Assignee: Rutgers, The State University of New Jersey
    Inventor: Elizabeth B. Torres
  • Patent number: 10881310
    Abstract: Aspects of the present disclosure are directed toward devices, apparatus, and methods for interfacing a PPG apparatus with the skin surface of a patient and sensing artifacts due to surface motion attributable to contact-based surface motion at or near where the apparatus in contact with the skin surface of the patient. The devices, apparatus, and methods include circuitry that contacts the skin surface of the patient, illuminates tissue at the surface, and senses a pulse photoplethysmography (PPG) signal of the patient in response thereto. Further, the circuitry senses artifacts due to surface motion, and responds to the sensed PPG signal by processing the sensed PPG signal relative to the sensed artifacts to produce a version of the sensed PPG signal that is indicative local blood volume and composition of the patient, and filtered to suppress noise therein due to the contact-based surface motion.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: January 5, 2021
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventor: Laurent B. Giovangrandi
  • Patent number: 10810752
    Abstract: A system includes a neural network implemented by one or more computers, in which the neural network includes an image depth prediction neural network and a camera motion estimation neural network. The neural network is configured to receive a sequence of images. The neural network is configured to process each image in the sequence of images using the image depth prediction neural network to generate, for each image, a respective depth output that characterizes a depth of the image, and to process a subset of images in the sequence of images using the camera motion estimation neural network to generate a camera motion output that characterizes the motion of a camera between the images in the subset. The image depth prediction neural network and the camera motion estimation neural network have been jointly trained using an unsupervised learning technique.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: October 20, 2020
    Assignee: Google LLC
    Inventors: Anelia Angelova, Martin Wicke, Reza Mahjourian
  • Patent number: 10743773
    Abstract: A computing device includes a thermal map generator (142) that generates a thermal map for image data voxels or pixels representing a volume or region of interest of a subject based on thermometry image data, which includes voxels or pixels indicating a change in a temperature in the volume or region of interest, and a predetermined change in value to temperature lookup table (144) and a display (145) that visually presents the thermal map in connection with image data of the volume of interest. A method includes generating a thermal map for image data voxels or pixels representing a volume or region of interest of a subject based on thermometry image data, which includes voxels or pixels indicating a change in a temperature in the volume or region of interest, and a predetermined change in voxel or pixel value to temperature lookup table.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: August 18, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Nadine Abi-Jaoudeh, Ming Li, Samuel Kadoury, Ankur Kapoor, Nicolaas Jan Noordhoek, Alessandro Guido Radaelli, Bart Carelsen, Bradford Johns Wood
  • Patent number: 10674921
    Abstract: Device for measuring blood pressure hemodynamically in blood vessels at one or more body locations comprising light source; at least three sensors including an array of at least three optical sensors, for receiving light and for obtaining a signal over time comprising temporal per pixel information for at least two wavelengths of light, and corresponding to a flow of blood within a blood vessel over time; a processing unit configured to receive the signal and generate a continuous dynamic blood pressure reading by using the temporal per pixel information for the at least two wavelengths of light to produce heart rate signals from the blood flow, and by applying a modified Windkessel model on the signal such that the blood pressure also depends on a spatial temporal pressure resistance function over time that depends on a body location of the blood flow over time, the pressure resistance function representing elastance/stiffness.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: June 9, 2020
    Assignee: CNOGA MEDICAL LTD.
    Inventor: Yosef Segman
  • Patent number: 10568525
    Abstract: In one embodiment, a method for creating a blood oxygen saturation (SpO2) value, the method comprises receiving one or more photoplethysmography (PPG) signals for SpO2 detection from one or more PPG sensors; receiving one or more PPG signals for characterizing a heart rate from the one or more PPG sensors; using the one or more PPG signals for SpO2 detection, forming one or more SpO2 datasets wherein the SpO2 datasets respectively comprise one or more noise components; removing the one or more noise components from the one or more SpO2 datasets that are inconsistent with a feature of the one or more PPG signals characterizing the heart rate to produce one or more filtered SpO2 datasets; and using the one or more filtered SpO2 datasets, creating and storing the SpO2.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: February 25, 2020
    Assignee: Fitbit, Inc.
    Inventors: Anjian Wu, Chris H. Sarantos, Peter W. Richards, Shelten Gee Jao Yuen
  • Patent number: 10524720
    Abstract: A biosensor includes an optical sensor circuit that emits light directed at skin tissue of a patient at a plurality of wavelengths. A first and second spectral response of light reflected from the tissue is obtained around a first wavelength in a UV range and a second wavelength in an IR range. A measurement of a substance in blood flow is then determined from the spectral responses. A risk of a health condition is obtained using the measurement. The health condition may include one or more of hyperglycemia, diabetes or hypoglycemia.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: January 7, 2020
    Assignee: SANMINA CORPORATION
    Inventor: Robert Steven Newberry
  • Patent number: 10444067
    Abstract: An optical sensing apparatus including a light sensor, a plurality of light-emitting devices, and a controller is provided. The light sensor is disposed on a substrate. The light sensor senses a light reflection signal in a sensing area of the optical sensing apparatus. The light-emitting devices are disposed on the substrate and around the light sensor. The light-emitting devices provide an optical signal to be transmitted into the human tissue. Then, the optical signal is reflected by the human tissue to generate the light reflection signal. The controller determines whether the position of the human tissue has been changed in the sensing area. The controller drives at least one light-emitting device of the light-emitting devices and adjusts the light intensity thereof to provide the appropriate optical signal. Besides, a measuring method of the optical sensing apparatus is proposed.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: October 15, 2019
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chia-Hao Hsu, Chun-Te Chuang, Chih-Jen Chen, Yu-Tang Shen
  • Patent number: 10314499
    Abstract: A device for monitoring heart rate or blood oxygen level during exercise is disclosed having sensors and emitters, wherein the sensors are used to monitor transmission from each of the emitters in turn. This provides a possibility that a smaller device can be provided since less sensors and emitters can be used while obtaining more number of observations. In some embodiments, the repeated use of sensors with different emitters introduces redundancy into the device so that the device is more robust and may function even in the event that one or two of the emitters and sensors have broken down.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: June 11, 2019
    Assignee: WELL BEING DIGITAL LIMITED
    Inventors: Ming Yip Wallace Wong, Chor Tin Ma
  • Patent number: 10258267
    Abstract: Systems, methods, and devices of the various embodiments provide a pulse oximeter capable of taking blood oxygen readings based on readings from an accelerometer. The various embodiments may provide an electronic patch including a pulse oximeter and accelerometer connected to a processor, wherein the processor is configured with processor executable instructions to control the operation of the pulse oximeter based at least in part on data received from the accelerometer. In various embodiments the electronic patch may further include a coin cell battery, or other low power source, that may power the pulse oximeter.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: April 16, 2019
    Assignee: CAPSULE TECHNOLOGIES, INC.
    Inventors: Robert Scott Ballam, Robert Bruce Ganton
  • Patent number: 10117590
    Abstract: An embodiment of the disclosure provides a method for measuring change in blood volume using a transcutaneous measurement system applied to a patient's skin. The method involves placing a sensor in contact with the skin of a patient, where the sensor includes a light emitter and a photodetector. An intensity of light emanating from the light emitter is set and an initial intensity of light received at the photodetector is determined, where the light received at the photodetector has traveled through the patient's tissue. A later determination is then made of the intensity of the light received at the photodetector. A change in the blood volume is determined based on the intensity of the light emanating from the light emitter, the initial intensity of light received at the photodetector and the final intensity of light received at the photodetector.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: November 6, 2018
    Assignee: Fresenius Medical Care Holdings, Inc.
    Inventors: Louis L. Barrett, David W. Peterson, Peter Kotanko
  • Patent number: 10045702
    Abstract: The present invention relates to a device (12) for obtaining a vital sign of a subject (14), comprising an interface (22) for receiving a set of image frames (24) of a subject (14), a signal extraction unit (26) for extracting a photoplethysmographic (PPG) signal of the subject (14) from said set of image frames (24), a signal evaluation unit (28) for determining a feature of said PPG signal indicative of the information content of the extracted PPG signal with respect to a desired vital sign of the subject (14), a processing unit (30) for determining a binning configuration based on the determined feature of the extracted PPG signal, said binning configuration being provided for controlling binning of image pixels of an image frame; and a vital signs determination unit (32) for determining vital sign information from the extracted PPG signal.
    Type: Grant
    Filed: September 28, 2014
    Date of Patent: August 14, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Vincent Jeanne, Hendrikus Petrus Maria Sterken
  • Patent number: 9974468
    Abstract: Systems and methods provided relate to patient sensors and/or patient monitors that recognize and/or identify a patient with physiological signals obtained from the sensor. A scalogram may be produced by applying a wavelet transform for the physiological signals obtained from the sensor. The scalogram may be a three dimensional model (having time, scale, and magnitude) from which certain physiological information may be obtained. For example, unique human physiological characteristics, also known as biometrics, may be determined from the scalograms. More specifically, monitoring the changes in the morphology of the photoplethysmographic (PPG) waveform transforms (e.g., scalogram) may determine patient-specific information that may be used to recognize and/or identify the patient, and that may be used to determine a proper or improper association between the patient and the wireless sensor and/or patient monitor.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 22, 2018
    Assignee: Covidien LP
    Inventors: Paul S. Addison, James N. Watson
  • Patent number: 9904761
    Abstract: The present invention covers the integration and utility of accelerometer features into a clinical analysis system. For example, measurement of dynamic acceleration and orientation of a blood-testing instrument with respect to Earth's gravitational field may be used to determine reliability of a test procedure and optionally to provide corrective elements thereof.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: February 27, 2018
    Assignee: Abbot Point of Care Inc.
    Inventors: Gary Vandersleen, Pierre Emeric, Paul Wasserman, Narendra Soman, Graham Davis
  • Patent number: 9877650
    Abstract: Systems and method for monitoring patient physiological data are presented herein. In one embodiment, a physiological sensor and a mobile computing device can be connected via a cable or cables, and a processing board can be connected between the sensor and the mobile computing device to conduct advanced signal processing on the data received from the sensor before the data is transmitted for display on the mobile computing device.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: January 30, 2018
    Assignee: MASIMO CORPORATION
    Inventors: Bilal Muhsin, Sujin Hwang, Benjamin C. Triman
  • Patent number: 9839397
    Abstract: A method and apparatus for determining a heart rate of a biological body are disclosed. In the method and apparatus, light having a first wavelength and light having a second wavelength are emitted at the biological body. The first wavelength is associated with a first absorption coefficient for blood components and the second wavelength is associated with a second absorption coefficient for the blood components that is less than the first absorption coefficient. A first reflected signal is captured as a result of the light having the first wavelength being reflected from the biological body and a second reflected signal is captured as a result of the light having the second wavelength being reflected from the biological body. A heart rate signal is obtained based on the first and second reflected signals. A heart rate of the biological body is determined based on the heart rate signal.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: December 12, 2017
    Assignee: STMicroelectronics S.r.l.
    Inventor: Alessandro Gumiero
  • Patent number: 9743838
    Abstract: Some embodiments relate to a device, method, and/or computer-readable medium storing processor-executable process steps to remove a component of a signal corresponding to ambient light in a photoplethysmographic sensor device, including capturing a first detected light signal representing an ambient light at a first time, causing a light emitter to generate a source light signal driven at a first level, capturing a second detected light signal representing the source light signal after interacting with a user's tissue plus the first detected light signal, generating a first output signal based on the second detected light signal adjusted by the first detected light signal, causing the light emitter to generate a source light signal driven at a second level, capturing a third detected light signal representing the source light signal driven at the second level after interacting with the user's skin plus the first detected light signal, and generating a second output signal based on the third detected light sig
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: August 29, 2017
    Assignee: FITBIT, INC.
    Inventor: Peter W. Richards
  • Patent number: 9706952
    Abstract: A system for heart performance characterization and abnormality detection detects peaks and at least one of, a valley and a baseline comprising a substantially zero voltage level, of received signal data representing oxygen content of blood in a patient vessel over multiple heart beat cycles. The signal processor determines signal parameters including at least one of, (a) a signal amplitude magnitude between a maximum peak and minimum valley, of the received signal data, (b) a signal amplitude magnitude between a maximum peak and a baseline, of the received signal data and (c) a signal amplitude magnitude between a second highest maximum peak and minimum valley, of the received signal data. The system compares a determined signal parameter or value derived from the determined signal parameter, with a threshold value and generates an alert message associated with the threshold, in response to the comparison.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: July 18, 2017
    Assignee: Siemens Healthcare GmbH
    Inventor: Hongxuan Zhang
  • Patent number: 9402571
    Abstract: Disclosed herein is a framework for facilitating biological tissue function analysis. In accordance with one aspect, saturation of hemoglobin with oxygen (SPO2) signal data is synchronized with respiration signal data. One or more waveform parameters may be generated based on the synchronized SPO2 signal data and the respiration signal data. One or more respiration-SPO2 parameters may then be determined based on the one or more waveform parameters and used to characterize the biological tissue function.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: August 2, 2016
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventor: Hongxuan Zhang
  • Patent number: 9289167
    Abstract: 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.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 22, 2016
    Assignee: MASIMO CORPORATION
    Inventors: Mohamed K. Diab, Rex J. McCarthy
  • Patent number: 9216001
    Abstract: The presence of a cardiac pulse in a patient is determined by evaluating physiological signals in the patient. In one embodiment, a medical device evaluates optical characteristics of light transmitted into a patient to ascertain physiological signals, such as pulsatile changes in general blood volume proximate a light detector module. Using these features, the medical device determines whether a cardiac pulse is present in the patient. The medical device may also be configured to report whether the patient is in a VF, VT, asystole, or PEA condition, in addition to being in a pulseless condition, and prompt different therapies, such as chest compressions, rescue breathing, defibrillation, and PEA-specific electrotherapy, depending on the analysis of the physiological signals. Auto-capture of a cardiac pulse using pacing stimuli is further provided.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: December 22, 2015
    Assignee: PHYSIO-CONTROL, INC.
    Inventors: James M. Owen, Cynthia P. Jayne, William E. Crone
  • Patent number: 9211095
    Abstract: A patient monitor including a physiological measurement logic engine receives physiological data from a physiological sensor. The logic engine abstracts one or more features of the physiological data and determines a category for the abstracted feature. The logic engine further encodes the category of each of the one or more features and determines an action to perform based on the encoded categories.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: December 15, 2015
    Assignee: MASIMO CORPORATION
    Inventor: Ammar Al-Ali
  • Patent number: 9135631
    Abstract: Methods, apparatuses and systems directed to sponsored story generation from an photo upload in an organic activity stream in a social networking site. A social networking system may apply computer image algorithms to detect image objects in user-uploaded images and videos, and promote them as sponsored stories.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: September 15, 2015
    Assignee: Facebook, Inc.
    Inventors: Justin Mitchell, Samuel Odio, David Harry Garcia
  • Publication number: 20150148637
    Abstract: Systems, methods and devices for reducing noise in health monitoring including monitoring systems, methods and/or devices receiving a health signal and/or having at least one electrode or sensor for health monitoring.
    Type: Application
    Filed: December 9, 2014
    Publication date: May 28, 2015
    Applicant: RHYTHM DIAGNOSTICS SYSTEMS, INC.
    Inventors: George Stefan Golda, Daniel Van Zandt Moyer, Mark P. Marriott, Sam Eletr, Bruce O'Neil
  • Publication number: 20150094552
    Abstract: Systems, methods and devices for reducing noise in health monitoring including monitoring systems, methods and/or devices receiving a health signal and/or having at least one electrode or sensor for health monitoring.
    Type: Application
    Filed: December 9, 2014
    Publication date: April 2, 2015
    Applicant: RHYTHM DIAGNOSTICS SYSTEMS, INC.
    Inventors: George Stefan Golda, Daniel Van Zandt Moyer, Mark P. Marriott, Sam Eletr, Bruce O'Neil
  • Patent number: 8957777
    Abstract: A method for establishing a connection between a first electronic computing device and a second electronic computing device includes moving the second electronic computing device so that it is proximal to the first electronic computing device. When the first electronic computing device detects the proximity of the first electronic computing device relative to the second electronic computing device, a radio on the first electronic device is set to a connectable and discoverable state. A wireless connection is automatically established between the first electronic computing device and the second electronic computing device. Data is transmitted between the first electronic computing device and the second electronic computing device.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: February 17, 2015
    Assignee: Welch Allyn, Inc.
    Inventors: Steven D. Baker, Braxton L. Lathrop
  • Patent number: 8954127
    Abstract: According to embodiments, 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 arrangement, energy values in the wedge region of the scalogram may be estimated by calculating a set of estimation locations in the wedge region and estimating scalogram energy values at each location. In an arrangement, scalogram energy values may be estimated based on an estimation scheme and by combining scalogram values in a vicinity region. In an arrangement, the vicinity region may include energy values in a resolved region of the scalogram and previously estimated energy values in the wedge region of the scalogram. In an arrangement, one or more signal parameters may be determined based on the resolved and estimated values of the scalogram.
    Type: Grant
    Filed: December 22, 2012
    Date of Patent: February 10, 2015
    Assignee: Nellcor Puritan Bennett Ireland
    Inventors: James Nicholas Watson, Paul Stanley Addison, Braddon M. Van Slyke
  • Patent number: 8948835
    Abstract: 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.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: February 3, 2015
    Assignee: Cercacor Laboratories, Inc.
    Inventor: Mohamed K. Diab
  • Patent number: 8942777
    Abstract: The present invention involves a method and an apparatus for analyzing measured signals, including the determination of a measurement of correlation in the measured signals during a calculation of a physiological parameter of a monitored patient. Use of this invention is described in particular detail with respect to blood oximetry measurements.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: January 27, 2015
    Assignee: Masimo Corporation
    Inventors: Mohamed K. Diab, Esmaiel Kiani-Azarbayjany, Walter M. Weber
  • Patent number: 8929963
    Abstract: The present disclosure relates generally to patient monitoring systems and, more particularly, to wireless patient sensors and patient monitors. In an embodiment, a patient sensor device includes an emitter configured to emit light into a tissue of a patient as well as a detector configured to detect the light from the tissue of the patient and produce a corresponding electrical signal. The patient sensor also includes signal processing circuitry configured to receive and convert the electrical signal of the detector into detector signal data. The patient sensor also includes a wireless module communicatively coupled to a patient monitor and configured to transmit a physiological parameter value, the detector signal data, or both, to the patient monitor. The patient sensor also includes a processor configured to determine whether the patient sensor or the patient monitor should calculate the physiological parameter value based, at least in part, on the detector signal data.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: January 6, 2015
    Assignee: Covidien LP
    Inventor: Daniel Lisogurski
  • Patent number: 8923945
    Abstract: 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.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: December 30, 2014
    Assignee: Covidien LP
    Inventor: Edward M. McKenna
  • Patent number: 8909312
    Abstract: A signal acquisition circuit detects a wanted signal in a composite signal containing the wanted signal and an unwanted signal, where the highest frequency in the unwanted signal is higher than the highest frequency in the wanted signal. A sensor captures the composite signal and an analog-to-digital converter samples and converts the composite signal to digital format, and a filter subtracts the unwanted signal from the composite signal. The sampled signal contains a first component containing the sum of the wanted signal and the unwanted signal sampled at a first rate at least equal to the Nyquist rate for the wanted signal but less than a second rate that is at least equal to the Nyquist rate for the unwanted signal, and a second component containing the unwanted signal sampled at the second rate.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: December 9, 2014
    Assignee: Microsemi Corporation
    Inventors: Didier Serge Sagan, Reghu Kunnath Rajan
  • Publication number: 20140343385
    Abstract: Methods and systems for determining a physiological parameter in the presence of correlated artifact are provided. One method includes receiving two waveforms corresponding to two different wavelengths of light from a patient. Each of the two waveforms includes a correlated artifact. The method also includes combining the two waveforms to form a plurality of weighted difference waveforms, wherein the plurality of weighted difference waveforms vary from one another by a value of a multiplier. The method further includes identifying one of the weighted difference waveforms from the plurality of weighted difference waveforms using a characteristic of one or more of the plurality of weighted difference waveforms and determining a characteristic of the correlated artifact based at least in part on the identified weighted difference waveform.
    Type: Application
    Filed: August 4, 2014
    Publication date: November 20, 2014
    Inventor: Clark R. Baker, JR.
  • Patent number: 8892180
    Abstract: 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.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: November 18, 2014
    Assignee: Masimo Corporation
    Inventors: Walter M. Weber, Ammar Al-Ali, Lorenzo Cazzoli
  • Patent number: 8874181
    Abstract: 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.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: October 28, 2014
    Assignee: Covidien LP
    Inventors: Ethan Petersen, William Shea, Bradford B. Chew
  • Patent number: 8868148
    Abstract: A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: October 21, 2014
    Assignee: Covidien LP
    Inventors: Pirow Engelbrecht, Fernando Rodriguez-Llorente, Nicholas James Wooder
  • Patent number: 8852094
    Abstract: A physiological parameter system has one or more parameter inputs responsive to one or more physiological sensors. The physiological parameter system may also have quality indicators relating to confidence in the parameter inputs. A processor is adapted to combine the parameter inputs, quality indicators and predetermined limits for the parameters inputs and quality indicators so as to generate alarm outputs or control outputs or both.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: October 7, 2014
    Assignee: Masimo Corporation
    Inventors: Ammar Al-Ali, John Graybeal, Massi E. Kiani, Michael Petterson, Chris Kilpatrick
  • Patent number: 8840562
    Abstract: 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.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: September 23, 2014
    Assignee: Covidien LP
    Inventors: Edward M. McKenna, Daniel Jon Peters
  • Publication number: 20140249390
    Abstract: 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.
    Type: Application
    Filed: March 4, 2014
    Publication date: September 4, 2014
    Inventor: Peter Bernreuter
  • Patent number: 8818475
    Abstract: Methods and systems for determining a physiological parameter in the presence of correlated artifact are provided. One method includes receiving two waveforms corresponding to two different wavelengths of light from a patient. Each of the two waveforms includes a correlated artifact. The method also includes combining the two waveforms to form a plurality of weighted difference waveforms, wherein the plurality of weighted difference waveforms vary from one another by a value of a multiplier. The method further includes identifying one of the weighted difference waveforms from the plurality of weighted difference waveforms using a characteristic of one or more of the plurality of weighted difference waveforms and determining a characteristic of the correlated artifact based at least in part on the identified weighted difference waveform.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: August 26, 2014
    Assignee: Covidien LP
    Inventor: Clark R. Baker, Jr.
  • Patent number: 8792949
    Abstract: 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.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: July 29, 2014
    Assignee: Covidien LP
    Inventor: Clark R. Baker, Jr.
  • Publication number: 20140200422
    Abstract: A method and an apparatus for separating a composite signal into a plurality of signals is described. A signal processor receives a composite signal and separates a composite signal in to separate output signals. Pre-demodulation signal values are used to adjust the demodulation scheme.
    Type: Application
    Filed: March 17, 2014
    Publication date: July 17, 2014
    Applicant: CERCACOR LABORATORIES, INC.
    Inventors: Walter M. Weber, Ammar Al-Ali
  • Patent number: 8768423
    Abstract: Optical coherence tomography (herein “OCT”) based analyte monitoring systems are disclosed. In one aspect, techniques are disclosed that can identify fluid flow in vivo (e.g., blood flow), which can act as a metric for gauging the extent of blood perfusion in tissue. For instance, if OCT is to be used to estimate the level of an analyte (e.g., glucose) in tissue, a measure of the extent of blood flow can potentially indicate the presence of an analyte correlating region, which would be suitable for analyte level estimation with OCT. Another aspect is related to systems and methods for scanning multiple regions. An optical beam is moved across the surface of the tissue in two distinct manners. The first can be a coarse scan, moving the beam to provide distinct scanning positions on the skin. The second can be a fine scan where the beam is applied for more detailed analysis.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: July 1, 2014
    Assignee: GLT Acquisition Corp.
    Inventors: Walter J. Shakespeare, William Henry Bennett, Jason T. Iceman, Howard P. Apple, Phillip William Wallace, Matthew J. Schurman
  • Patent number: 8761855
    Abstract: 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.
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: June 24, 2014
    Assignee: Nellcor Puritan Bennett Ireland
    Inventors: James Nicholas Watson, Paul Stanley Addison
  • Patent number: 8755856
    Abstract: 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.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: June 17, 2014
    Assignee: Masimo Corporation
    Inventors: Mohamed K. Diab, Esmaiel Kiani-Azarbayjany, Ibrahim M. Elfadel, Rex J. McCarthy, Walter M. Weber, Robert A. Smith