Acoustic pulse and respiration monitoring system
First Claim
1. A physiological monitoring system configured to non-invasively detect acoustic vibrations indicative of one or more physiological parameters of a medical patient, the physiological monitoring system comprising:
- an acoustic sensor associated with a transfer function, the transfer function indicative of a transform caused by at least one of processing circuitry of the acoustic sensor or a piezoelectric membrane of the acoustic sensor, wherein the acoustic sensor is configured to be attached to a medical patient, detect acoustic vibrations associated with the medical patient, and generate a patient signal indicative of the acoustic vibrations, wherein the transfer function of the acoustic sensor has an effect on the patient signal such that the patient signal can be modeled as a derivative with respect to time of a signal indicative of the acoustic vibrations;
a memory configured to store the transfer function of the acoustic sensor; and
a processor in communication with the acoustic sensor and the memory, and configured to;
retrieve, from the memory, the transfer function of the acoustic sensor,determine the transfer function of the acoustic sensor based at least in part on the transfer function of the acoustic sensor,deconvolve the patient signal using the transfer function of the acoustic sensor to lessen the effect of the transfer function on the patient signal to generate a deconvolved patient signal indicative of the acoustic vibrations,estimate a physiological parameter of the medical patient based at least in part on the deconvolved patient signal, wherein the physiological parameter includes at least one of a respiratory parameter or a cardiac parameter, andoutput an indication of the estimated physiological parameter for presentation to a care giver.
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Accused Products
Abstract
An acoustic sensor attached to a medical patient can non-invasively detect acoustic vibrations indicative of physiological parameters of the medical patient and produce an acoustic signal corresponding to the acoustic vibrations. The acoustic signal can be integrated one or more times with respect to time, and a physiological monitoring system can determine pulse or respiration parameters based on the integrated acoustic signal. The physiological monitoring system can, for instance, estimate a pulse rate according to pulses in the integrated acoustic signal and a respiration rate according to a modulation of the integrated acoustic signal, among other parameters. Further, the physiological monitoring system can compare the integrated acoustic signal or parameters determined based on the integrated acoustic signal with other signals or parameters to activate alarms.
1022 Citations
20 Claims
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1. A physiological monitoring system configured to non-invasively detect acoustic vibrations indicative of one or more physiological parameters of a medical patient, the physiological monitoring system comprising:
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an acoustic sensor associated with a transfer function, the transfer function indicative of a transform caused by at least one of processing circuitry of the acoustic sensor or a piezoelectric membrane of the acoustic sensor, wherein the acoustic sensor is configured to be attached to a medical patient, detect acoustic vibrations associated with the medical patient, and generate a patient signal indicative of the acoustic vibrations, wherein the transfer function of the acoustic sensor has an effect on the patient signal such that the patient signal can be modeled as a derivative with respect to time of a signal indicative of the acoustic vibrations; a memory configured to store the transfer function of the acoustic sensor; and a processor in communication with the acoustic sensor and the memory, and configured to; retrieve, from the memory, the transfer function of the acoustic sensor, determine the transfer function of the acoustic sensor based at least in part on the transfer function of the acoustic sensor, deconvolve the patient signal using the transfer function of the acoustic sensor to lessen the effect of the transfer function on the patient signal to generate a deconvolved patient signal indicative of the acoustic vibrations, estimate a physiological parameter of the medical patient based at least in part on the deconvolved patient signal, wherein the physiological parameter includes at least one of a respiratory parameter or a cardiac parameter, and output an indication of the estimated physiological parameter for presentation to a care giver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18)
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13. A method of determining values indicative of one or more physiological parameters of a medical patient, the method comprising:
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receiving a patient signal from an acoustic sensor attached to a medical patient, wherein the acoustic sensor is associated with a transfer function indicative of a transform caused by at least one of processing circuitry of the acoustic sensor or a piezoelectric membrane of the acoustic sensor, wherein the acoustic sensor is configured to detect acoustic vibrations associated with the medical patient and generate the patient signal, wherein the patient signal is indicative of the acoustic vibrations, wherein the transfer function of the acoustic sensor has an effect on the patient signal such that the patient signal can be modeled as a derivative with respect to time of a signal indicative of the acoustic vibrations, retrieving, from memory, the transfer function of the acoustic sensor; deconvolving the patient signal using the transfer function of the acoustic sensor to diminish the effect of the transfer function on the patient signal to generate a deconvolved patient signal indicative of the acoustic vibrations; estimating, using a processor, a physiological parameter of the medical patient based at least in part on the deconvolved patient signal, wherein the physiological parameter includes at least one of a respiratory parameter or a cardiac parameter; and outputting an indication of the estimated physiological parameter for presentation to a care giver. - View Dependent Claims (14, 15, 16, 17, 19, 20)
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Specification