Exhalation valve means of a respiration mask

Details Exhalation valve means of a respiration mask Exhalation valve means of a respiration mask

1988-09-26

1991-02-12

Burr, Edgar S.

Surgery

Respiratory method or device

Face mask covering a breathing passage

12820524, 12820525, 12820612, A62B 1810, A62B 1802

Patent

active

049915770

ABSTRACT:
An exhalation valve means of a positive pressure type respiration mask which can be easily converted to a non-positive pressure type (atmospheric pressure type) mask when necessary.
The exhalation valve means includes a valve body unit, which comprises an exhalation value seat, a valve body supporting member which is detachably mounted within an exhalation valve chamber, and a valve body which is supported by said valve body supporting member and energized against said exhalation valve seat. Said valve seat has a means for mounting a rubber membrane valve body which is used for the valve body unit.

REFERENCES:
patent: 2629375 (1953-02-01), Holmes
patent: 3262447 (1966-07-01), Burke
patent: 3342200 (1967-09-01), Wilcox
patent: 3575206 (1971-04-01), Ulmann
patent: 3973588 (1976-08-01), Holst
patent: 4004603 (1977-01-01), Jones
patent: 4850346 (1989-07-01), Michel et al.

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