Breath sensing apparatus
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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Nov 17, 1992
filing date -
Nov 17, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A breathing sensor comprising a thin flexible compliant film transducer exhibiting piezoelectric and pyroelectric properties. The transducer preferably comprises a thin film of polyvinylidene fluoride (PVDF) having a pattern of metallization on the opposed surfaces thereof defining electrodes. The transducer is designed to be affixed proximate a person's airway such that the tidal flow of inspired and expired air will impinge upon the transducer. It is adapted to be coupled to electronic circuitry for indicating normal breathing, for providing an alarm in the event of sleep apnea and for providing an indication when sound related to respiratory distress is present.
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