发明名称 |
Respiratory exchange ratio sensor |
摘要 |
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 </SUB>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 </SUB>and CO<SUB>2 </SUB>to provide a measure at the relative ratio of the two gases present. |
申请公布号 |
US7390304(B2) |
申请公布日期 |
2008.06.24 |
申请号 |
US20050095271 |
申请日期 |
2005.03.31 |
申请人 |
MEDICAL GRAPHICS CORPORATION |
发明人 |
CHEN YU;HOWARD C. PETER;SNOW MICHAEL G. |
分类号 |
A61B5/083;A61B5/00;A61B5/02;A61B5/05 |
主分类号 |
A61B5/083 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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