Demand valve for a respirator

Details Demand valve for a respirator Demand valve for a respirator

1990-02-15

1991-08-27

Lewis, Aaron J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820426, A62B 902

Patent

active

050424734

ABSTRACT:
A demand valve for a respirator. A fixed tube directs pressurized air flow from the source into an opening for a mask. The venturi effect caused by directed air flow through the housing acts to draw the diaphragm toward the respirator face mask. A portion of the air directed by the tube escapes and is directed over the tube by a hinged three sided arm. Air flow so directed by the arm creates a low pressure area within the arm thus pulling the arm toward the tube. The arm is in engagement with the stem of an air valve which when the arm is drawn toward the tube opens the valve to provide continued air flow into the mask without continued effort on the user's behalf.

REFERENCES:
patent: 2878807 (1959-03-01), Gagnan
patent: 3095890 (1963-07-01), Cousteau et al.
patent: 3595226 (1971-07-01), Newcombe
patent: 4002166 (1977-01-01), Oliver
patent: 4066076 (1978-01-01), Williamson
patent: 4076041 (1978-02-01), Christianson
patent: 4214580 (1980-07-01), Pedersen
patent: 4437460 (1984-03-01), Glynn
patent: 4676238 (1987-06-01), Wetzel et al.
patent: 4693242 (1987-09-01), Biard
patent: 4889115 (1989-12-01), Bozano

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