SLEEP APNEA MONITORING AND DIAGNOSIS BASED ON PULSE OXIMETERY AND TRACHEAL SOUND SIGNALS
First Claim
25. Apparatus for use in analysis of breathing pattern of a patient during sleep for detection of apnea/hypopnea events comprising:
- a microphone arranged to be located on the patient for generating signals in response to breathing and snore sounds from the patient;
a detector module for receiving and analyzing the microphone signals to extract data relating to the breathing;
wherein the detector module is arranged to extract and separate time periods and to divide those periods into groups with snore sounds, groups with breathing sounds and groups with noise;
and wherein the detector module is arranged to calculate the relative and absolute energy and duration of the sound periods to classify the sound periods into the three groups of breath, snore and noise.
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Accused Products
Abstract
Detection of apnea/hypopnea events to calculate an apnea/hypopnea index is obtained by analysis of breathing pattern of a patient from breathing and snore sounds and a finger probe recording the SaO2 signal. A detector analyzes microphone signals to detect breath, snore and noise sounds in response to a detected drop in the SaO2 level greater than 2% and to extract and analyze the breathing sounds from a limited time period starting prior to the drop of the SaO2 signal and ending at least at the end of each drop. Separated time periods are divided phases with snore sounds and those with breathing sounds and an estimated breathing volume adjacent to a snore phase is used to estimate the airflow of the snore phase. The relative and absolute energy and duration of the sound periods is used to classify the sound periods into the three groups of breath, snore and noise.
27 Citations
28 Claims
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25. Apparatus for use in analysis of breathing pattern of a patient during sleep for detection of apnea/hypopnea events comprising:
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a microphone arranged to be located on the patient for generating signals in response to breathing and snore sounds from the patient; a detector module for receiving and analyzing the microphone signals to extract data relating to the breathing; wherein the detector module is arranged to extract and separate time periods and to divide those periods into groups with snore sounds, groups with breathing sounds and groups with noise; and wherein the detector module is arranged to calculate the relative and absolute energy and duration of the sound periods to classify the sound periods into the three groups of breath, snore and noise. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28)
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28-1. The apparatus according to claim 27 wherein the detector module is arranged to use the estimated airflow to detect periods of apnea and/or hypopnea.
Specification