Unidirectional fluid valve

Details Unidirectional fluid valve Unidirectional fluid valve

1987-03-26

1990-06-19

Hindenburg, Max

Surgery

Respiratory method or device

Face mask covering a breathing passage

12820615, 137855, A62B 1810

Patent

active

049343629

ABSTRACT:
The exhalation valve of a respiratory face mask, while taking up only a small area, can afford extraordinarily low pressure drop for easy breathing if constructed with a valve seat having a seal edge that defines an orifice and also forms a parabola in the plane bisecting the mask. Preferably the seal edge forms a rectangle as viewed against the direction of composite fluid flow through the valve, and a flexible flap is attached to a bridge across the center of the orifice at the apex of said parabola, each end of the flap being free to be lifted to allow fluid to flow through the valve.

REFERENCES:
patent: 771327 (1904-04-01), Schmidt
patent: 2999498 (1961-09-01), Matheson
patent: 3312237 (1967-04-01), Mon et al.
patent: 3416562 (1968-12-01), Freeman
patent: 4414973 (1983-11-01), Matheson et al.
patent: 4631376 (1986-12-01), Leone
patent: 4749003 (1988-06-01), Leason
Northvale (Engineering) Ltd., Research Disclosure, Check Valve Sep. 1974.

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