Respiratory air flow sensor
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United States of America Patent
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Jul 20, 1999
Issued Date -
N/A
app pub date -
Oct 14, 1998
filing date -
Oct 18, 1997
priority date (Note) -
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Abstract
The air flow sensor for a respiratory air flow measuring systems includes a tubular member for providing an air passageway for the flow of air between a patient and a ventilator. The passageway includes a fixed orifice-type obstruction comprised of a plurality of aerodynamically curved vanes which produce a pressure drop as the air flows through the passageway. The air flow rate of the patient's respirations is calculated by measuring the pressure differential between two longitudinally spaced apart pressure measuring air ports bored within one of the vanes in the air flow sensor. A third air port hole extracts respiratory gas samples for content analysis.
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