Surgery – Respiratory method or device – Respiratory gas supply means enters mouth or tracheotomy...
Patent
1990-12-14
1993-03-30
Burr, Edgar S.
Surgery
Respiratory method or device
Respiratory gas supply means enters mouth or tracheotomy...
12820523, A61M 1600
Patent
active
051974649
ABSTRACT:
Methods and apparatus for ascertaining whether there is at least a threshold concentration of carbon dioxide in gases being monitored. Reversible hydration of the carbon dioxide to generate excess hydrogen ions and trigger a color change in a pH sensitive indicator is employed in represenative embodiments of the invention to provide a indication that the threshold concentration of carbon dioxide is present in the gases. The methods and apparatus may be used to distinguish between tracheal and esophageal intubation of human and other nammalian patients.
REFERENCES:
patent: 2890177 (1959-06-01), Kilmer
patent: 3114610 (1963-12-01), Gafford et al.
patent: 4557900 (1985-12-01), Heitzmann
patent: 4728499 (1988-03-01), Fehder
Babb Albert L.
Hlastala Michael P.
Tarbox Gary L.
Burr Edgar S.
Lewis Aaron J.
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