Measuring and testing – Gas analysis – Gas chromatography
Patent
1980-10-20
1982-08-31
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
7386302, 7386175, 128719, G01N 3106
Patent
active
043465846
ABSTRACT:
Apparatus for automatically analyzing a gas sample to determine the concentration of an absorbable gas therein, such as carbon dioxide in a patient's out breath. In the preferred embodiment, the end tidal volume of the patient's out breath is automatically sampled, drawn into a sample cylinder, circulated through an absorber, and the volumetric reduction effected by the absorption of the absorbable gas measured by a pressure indicator, all of which is cycled by the normal respiration cycle of the patient through an end of breath detector mechanism. The end of breath detector mechanism may also be used as a gas flow meter generally.
REFERENCES:
patent: 1685557 (1928-09-01), Regelsberger
patent: 3530714 (1970-09-01), Akeley
patent: 3910261 (1975-10-01), Ragsdale et al.
patent: 3951137 (1976-04-01), Conkle et al.
patent: 4202352 (1980-05-01), Osborn
patent: 4233842 (1980-11-01), Raemer et al.
Colorimetry and Gas Analysis, Chapter 16, pp. 480-483.
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