Respiratory exchange ratio sensor
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United States of America Patent
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Jun 24, 2008
Grant Date -
Oct 12, 2006
app pub date -
Mar 31, 2005
filing date -
Mar 31, 2005
priority date (Note) -
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Abstract
A device for directly measuring a person's respiratory exchange ratio (RER) utilizes a Zn-air battery cell and a constant current load circuit as an O.sub.2 pump capable of drawing oxygen from expired air. A thermistor located in the flow path forms a leg of a bridge circuit whose output is proportional to oxygen concentration in the expired air and, therefore, to oxygen uptake. The thermistor flowmeter circuit utilizes the thermal conductivity differences between O.sub.2 and CO.sub.2 to provide a measure at the relative ratio of the two gases present.
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