Moisture control in a transdermal blood alcohol monitor
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United States of America Patent
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Issued Date -
Jan 10, 2008
app pub date -
Jun 16, 2006
filing date -
Jun 16, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Moisture buildup inside an alcohol monitor that is securely attached to a human subject is due to the inlet air from the subject's skin surface, which constantly emits water vapor in the form of insensible skin perspiration. As the warm moist air flows along the air flow path through decreasing temperatures within the alcohol monitor, moisture will be removed from the air through condensation. The present invention solves this condensation problem by first simplifying the air flow path, eliminating barriers that can trap water. Second, additional changes to the air flow path take advantage of gravity, allowing water to drain out of the alcohol monitor. Third, by better balancing the volume of air sample between the sample collection chamber and the fuel cell sample chamber, the total volume of air taken in is reduced, resulting in an overall reduction in the volume of potential moisture introduced into the alcohol monitor.
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