Surgery – Respiratory method or device – Face mask covering a breathing passage
Patent
1988-10-06
1990-12-04
Burr, Edgar S.
Surgery
Respiratory method or device
Face mask covering a breathing passage
12820712, 12820622, A62B 1802, A62B 1810
Patent
active
049745867
ABSTRACT:
A breathing mask is provided which comprises an exhaling valve disposed in an opening of the breathing mask wall. The exhaling valve includes a thin diaphragm which is adapted to be moved by the breathing pressure during inhaling and exhaling either towards or away from a sealing seat. To provide a less expensive breathing mask whose exhaling valve safely closes in particular in dust-particle-containing air and which nevertheless involves low opening and closing pressures, the diaphragm is provided with an arch. Air is allowed to escape over only a part of the circumference of the diaphragm, while the remaining part of the diaphragm circumference is so connected to a base member that the arching direction of the arch is at least partly reversible by the breathing pressure.
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Skov Martin
Wandel Heinz
Asher Kimberly L.
Burr Edgar S.
Moldex/Metric Products, Inc.
Roston Ellsworth R.
Schwartz Charles H.
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