A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
137/1.55
A62B 7/00 (2006.01) A61M 16/00 (2006.01) A62B 9/02 (2006.01)
Patent
CA 1120372
Docket 2457 -13- DEMAND INHALATION VALVE SYSTEM Abstract of the Disclosure A valve body (28) defines a chamber (65) having an inlet (72) connected to a gas supply and an outlet (29) connected to a face mask. The valve body supports a flexible diaphragm (40) connected by an adjust- able lever mechanism (59, 118, 110) to a movable valve member or piston (95) so that the diaphragm opens the valve piston in response to a pre- determined differential pressure across the diaphragm produced by inhalation. The valve also includes differential gas pressure means (80, 92, 102) for further opening the valve piston in response to a suction force produced by the flow of gas past the valve piston and independent of the diaphragm actuation to provide for minimizing the inhalation effort by the individual regardless of the volume of gas demanded during inhala- tion. The valve piston is closed in response to a light force of a spring (103) when the differential fluid pressure ceases and the supply gas pressure acts on a differential area of the valve piston (95) to hold the valve closed.
320460
Gowling Lafleur Henderson Llp
Isaacson Max
LandOfFree
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