Surgery – Truss – Pad
Patent
1969-01-21
1976-03-02
Howell, Kyle L.
Surgery
Truss
Pad
62 50, 128203, A62B 706
Patent
active
039411249
ABSTRACT:
A process for supplying the proper amount of oxygen in a breathing gas mixture of at least one inert gas for use at any pressure by passing the gas mixture through the liquid phase of a cryogenic liquid-vapor system containing oxygen and thereby saturating with oxygen the gas mixture at the system pressure. The saturation concentration of oxygen in the gas stream is controlled to the desired oxygen partial pressure substantially independent of the total pressure of gas mixture by controlling the temperature of the two-phase cryogenic system.
A device embodying the process includes oxygen in liquid-vapor form within a container to which are connected gas conduits, one for delivering the saturated breathing gas mixture to a user and the other for returning the exhaled gas to the container. A filter in the return conduit extracts carbon dioxide and water vapor. The return gas is cooled to the cryogenic temperature and the saturated gas is heated to breathing temperature by a heat exchanger thermally connecting the two conduits. The two-phase system is maintained at the proper constant temperature by submerging the container in a tank of liquid nitrogen and allowing the nitrogen to boil-off at a certain pressure. A supply of inert gas is stored under high pressure in the container. A regulator determines total pressure requirements for the user and releases sufficient inert gas through the liquid oxygen to maintain required total pressure.
REFERENCES:
patent: 3221733 (1965-12-01), Beasley
patent: 3316905 (1967-05-01), Seeler
patent: 3366107 (1968-01-01), Frantom
patent: 3807396 (1974-04-01), Fischell
Rodewald Newell C.
Sinor Jerry E.
Howell Kyle L.
Wattles Frank
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