Mask with anti-asphyxia valve

Details Mask with anti-asphyxia valve Mask with anti-asphyxia valve

2007-02-13

2007-02-13

Mitchell, Teena (Department: 3743)

Surgery

Respiratory method or device

Face mask covering a breathing passage

C128S207120, C128S205240

Reexamination Certificate

active

11285077

ABSTRACT:
An anti-asphyxia valve includes at least one flap having a first portion adapted for mounting to the housing and a second portion adapted to flex between a first open position allowing gas to pass from the patient side to the housing interior through the at least one port, and from the blower side through the at least one port, to atmosphere when a difference in gas pressure in the housing interior and atmosphere is below a predetermined operating threshold, and a second forcibly closed position substantially occluding the at least one port when the difference in gas pressure between the housing interior and atmosphere is substantially equal to or above the operating threshold.

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