Blood alcohol concentration measuring from respiratory air
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United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Jun 25, 1996
filing date -
Jun 26, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for measuring a blood alcohol content value by means of a breath alcohol concentration as well as for securing the reliability of this measured value. The apparatus comprises: sensor elements (1) for obtaining a measured alcohol concentration value from an incoming exhalation air stream; sensor elements (1) for obtaining a measured carbon dioxide concentration value from the same exhalation air stream (9); as well as first output elements (2) for producing, if necessary, a result proportional at least to a blood alcohol content. The apparatus further includes a first memory (M1) for storing a predetermined carbon dioxide lower threshold value or lower threshold values (R1, R2, R3 and/or Rf) and/or an upper threshold value or upper threshold values (R4, R5, R6 and/or Rg) and a first comparing element (C1) for comparing the measured carbon dioxide concentration value to said threshold values as well as a first logic element (L1) for producing outputs of a preset type depending on whether the measured carbon dioxide concentration fails to reach or exceeds the predetermined lower threshold values or upper threshold values.
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