Method and apparatus for assessing blood concentration of volatile constituent
A technology of blood concentration and concentration, which is applied in the direction of analyzing materials, immunoassay, transportation and packaging, etc., which can solve the problems of increasing cost and time consumption
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[0050] The method of the present invention is based on measuring the concentration of alcohol and carbon dioxide in the exhaled stream from the mouth of the subject, diluted in ambient air. As such, the method can use a sensor arrangement that can be placed at a distance from the subject's mouth and nose, preferably up to half a meter from the subject's mouth and nose. At this distance, the airflow exhaled by the subject may be diluted tenfold by ambient air.
[0051] According to the invention, the concentrations of carbon dioxide and alcohol are measured simultaneously in close proximity to each other in the air stream exhaled from a subject, such as a human being, C extco2 and C extEtoH . The dilutions of the two gases with respect to the corresponding alveolar concentrations are assumed to be equal and are determined in part by the alveolar volume V alv The associated dead volume V ds composition, resulting in part from the transient dilution of exhaled air from the su...
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