Mask with anti-asphyxia valve
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United States of America Patent
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-
Feb 13, 2007
Grant Date -
Apr 13, 2006
app pub date -
Nov 23, 2005
filing date -
Feb 9, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
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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