Carbon dioxide-based bi-level CPAP control
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United States of America Patent
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Feb 4, 2014
Grant Date -
Dec 22, 2005
app pub date -
Aug 18, 2005
filing date -
Sep 28, 2000
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Abstract
A system and method of providing bi-level CPAP therapy is provided that incorporates an infrared carbon-dioxide sensor to determine whether a patient is inhaling or exhaling. Patient exhalation causes the infrared light to be absorbed, while patient inhalation reduces the presence of carbon-dioxide causes little or no absorption of carbon-dioxide. The level of carbon-dioxide in an associated patient breathing interface is monitored for thresholds that trigger higher CPAP pressure upon inhalation and lower CPAP pressure upon exhalation.
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