Estimation of flow and detection of breathing in CPAP treatment
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United States of America Patent
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Apr 21, 1998
Grant Date -
N/A
app pub date -
Dec 2, 1994
filing date -
Dec 3, 1993
priority date (Note) -
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Abstract
Apparatus and methods for the estimation of flow and the detection of breathing (respiration) in continuous positive airway pressure (CPAP) treatment are disclosed. CPAP apparatus typically includes a flow generator for supplying air to a mask via a gas delivery tube. With changing air flow, the flow generator's speed and/or driving electrical current will alter in a manner defined by the controlling circuitry. Signals can be derived from measurements of motor speed and current, and these signals vary cyclically with patient respiration. By filtering to reject non-respiratory components, the resultant signal can be utilised to determine the instants in time at which the patient starts to inhale and exhale. The filtered signal also can be linearised using a predetermined knowledge of the pressure/flow/speed characteristics of the flow generator, and thus to derive a volumetric measure of airflow.
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