Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1997-02-11
1998-07-14
Asher, Kimberly L.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820127, 12820428, 12820513, 12820517, A62B 710, A62B 1900, A62B 2302, B63C 1102
Patent
active
057788766
ABSTRACT:
A self-contained underwater breathing loop apparatus for an oxygen rebreather includes a breathing bag formed to act as a compliant volume and a semipermeable membrane arranged to divide the breathing bag into a first chamber and a second chamber. A breathing hose is connected between a mouthpiece and the first chamber of the breathing bag to conduct exhaust breath from the diver thereto. The semipermeable membrane is formed to allow helium in the diver's exhaust breath to pass therethrough while preventing oxygen in the exhaust breath from being transported from the first chamber into the second chamber. A relief valve in the second chamber allows helium in the second chamber to be expelled into the water. A CO.sub.2 scrubber is in fluid communication with the first chamber of the breathing bag. A helium supply in fluid communication with the CO.sub.2 scrubber for supplying helium to the breathing loop through a metering valve. The helium supply preferably may be manually controlled by the diver to add helium in controlled amounts to the breathing loop to permit the diver to descend to a greater depth.
REFERENCES:
patent: 3957043 (1976-05-01), Shelby
patent: 5315988 (1994-05-01), Clarke et al.
patent: 5503145 (1996-04-01), Clough
Asher Kimberly L.
Gilbert Harvey A.
The United States of America as represented by the Secretary of
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