Breathing sound analysis for estimation of airlow rate

a technology of airlow rate and breathing sound, which is applied in the field of breathing sound analysis for estimation of airlow rate, can solve the problems of inaccurate measurement of airflow, application of these techniques, and the inability of devices to be used during swallowing assessment, so as to effectively cancel the effect of heart sounds
US20080243017A1Inactive Publication Date: 2008-10-02TR TECH
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
TR TECH
Publication Date
2008-10-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

Apparatus for use detection of apnea includes a microphone mounted in the ear of the patient for detecting breathing sounds and a second external microphone together with an oximetric sensor. A transmitter at the patient compresses and transmits the signals to a remote location where there is provided a detector module for receiving and analyzing the signals to extract data relating to the breathing. The detector uses the entropy or range of the signal to generate an estimate of air flow while extracting extraneous snoring and heart sounds and to analyze the estimate of air flow using Otsu's threshold to detect periods of apnea and / or hypopnea. A display provides data of the detected apnea / hypopnea episodes and related information for a clinician.
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Description

[0001] This invention relates to an apparatus for use in breathing sound analysis for estimation of airflow rate.

[0002] This application is related to a co-pending Application filed on the same day as this application under Attorney Docket No. 84201-1402 and entitled BREATHING SOUND ANALYSIS FOR DETECTION OF SLEEP APNEA / HYPOPNEA EVENTS.BACKGROUND OF THE INVENTION

[0003] Acoustical respiratory flow estimation has drawn much attention in recent years due to difficulties in airflow measurement. In clinical respiratory and / or swallowing assessment, flow is usually measured by spirometry devices, such as pneumotachograph, nasal cannulae connected to a pressure transducer, heated thermistor or anemometry. Airflow is also measured by indirect means, i.e., detection of chest and / or abdominal movements using respiratory inductance plethysmography (RIP), strain gauges, or magnetometers. The most reliable measurement of airflow is achieved by a mouth piece or facemask connected to a pneumotachogra...

Claims

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