Method for assuring valid measured values of breath alcohol conc

Details Method for assuring valid measured values of breath alcohol conc Method for assuring valid measured values of breath alcohol conc

1982-06-23

1984-07-17

Howell, Kyle L.

Surgery

Truss

Pad

A61B 500

Patent

active

044599943

ABSTRACT:
A method for assuring valid measured values of breath alcohol concentration for the determination of the alcohol concentration in human blood by means of a gas analyzer operating on the principle of infrared absorption. Values of the rise of expiration concentration S(t) independent of the vital capacity of the subject, that is, the maximum expiration volume after deep inhalation, are calculated from the measured values of the breath alcohol concentration and expiration volume and subjected to a criterion comprising positive and negative threshold values (trigger levels) before they are released for further processing.
The giving out of invalid measured values, which are attributable to too low an expiration volume, too short an expiration time, residual alcohol in the mouth or insufficient sample volume, is avoided.

REFERENCES:
patent: 4140106 (1979-02-01), Kirmaier
patent: 4314564 (1982-02-01), Albarda
patent: 4316380 (1982-02-01), Heim et al.

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