Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1987-10-08
1989-02-07
Coven, Edward M.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820524, 12820621, 12820712, A61M 1600
Patent
active
048024724
ABSTRACT:
An air supply device which may be used for emergencies such as an escape from a buring building comprises an air tank having a hose connected to a face mask and an activation element and a regulation element. The activation element consists of a spring biased valve which will automatically move to an opened position when a holding pin is released. The regulation element consists of a U-shaped valve having a first end for covering apertures leading to the hose and a second end in engagement with an expansion element. As air is removed from the tank during use of the device, the expansion element will expand due to a decrease in air pressure within the tank. As the expansion element enlarges, the U-shaped valve will move so as to expose additional apertures. A constant supply of air is therefore easily and automatically maintained.
REFERENCES:
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patent: D251622 (1979-04-01), Garrison et al.
patent: D283742 (1986-05-01), Hall
patent: 2733042 (1956-01-01), Culbertson
patent: 2931357 (1960-04-01), Arborelius et al.
patent: 4233970 (1980-11-01), Kranz
patent: 4565196 (1986-01-01), Melby et al.
Coven Edward M.
Lacyk J. P.
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