Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1993-05-07
1995-07-18
Asher, Kimberly L.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820527, 12820524, A62B 710, A62B 1900, A62B 2302
Patent
active
054331943
ABSTRACT:
A valve for draining liquid from a pressurized gas system having a time-varying pressure comprises a housing defining an internal cavity communicating with (a) an inlet adapted to receive the time-varying pressure from the gas system, and (b) an outlet subject to ambient or subambient pressure. An inlet valve is movable in the housing between a first position that seals the inlet from the cavity and a second position that opens the inlet to the cavity in response to a predetermined pressure value. An outlet valve is movable in the housing between a first position that seals the outlet from the cavity and a second position that opens the cavity to the outlet. The inlet and outlet valves are biased so that the outlet valve is closed when the inlet valve is open, and the outlet valve is open for at least a substantial part of the time that the inlet valve is closed when the inlet pressure decreases below the predetermined value. In several embodiments, the inlet and outlet valves are separate valving elements that are movable axially relative to each other. In one embodiment, a single valving element has an upstream portion that serves as the inlet valve and a downstream portion that serves as the outlet valve, the outlet valving portion being open when the inlet valving portion is closed, and the outlet valving portion being closed when the inlet valving portion is open.
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