Spring-free pressure regulator with structure isolating exhaled

Details Spring-free pressure regulator with structure isolating exhaled Spring-free pressure regulator with structure isolating exhaled

1995-01-20

1998-08-04

Asher, Kimberly L.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820426, 137505, 1375052, F16K 3112, F16K 3126, A61M 1600, A62B 704

Patent

active

057878838

ABSTRACT:
A gas mixing pressure regulator for a closed circuit breathing apparatus comprises a first inlet to provide pressurized air to the breathing apparatus, a pressure responsive demand valve for opening and closing a first inlet, a second inlet for supplying carbon dioxide-free exhaled air from the breathing apparatus, and a mixing chamber for mixing the pressurized air and exhaled air for supplying breathable air to the breathing apparatus. The demand valve is isolated from the mixing chamber by a check valve injector nozzle to prevent contamination thereof and is responsive to pressure demands from the breathing apparatus to ensure reliability, stability and long life.

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