Method and apparatus for detecting apnea
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United States of America Patent
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-
May 3, 1983
Grant Date -
N/A
app pub date -
Feb 27, 1981
filing date -
Feb 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apnea monitor having a capacitance type transducer pad providing a signal indicative of respiration. The resilient dielectric material between the capacitor plates is formed in two layers with the upper layer having a lesser spring constant to make the pad more sensitive around the periphery of the body to respond to respiratory motion while rejecting cardiovascular motion. The transduced signal is monitored and its gain is automatically adjusted to compensate for long term instability by a gain-set circuit arrangement having a time delay to assure that changes in the signal are not caused by apnea. A control voltage generated by the circuit operates the alarm without excessive time delay and is also used to provide a gain-set voltage for adjustment of the signal gain.
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