Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1981-08-11
1984-03-13
Cohen, Lee S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820524, 137491, A62B 700
Patent
active
044360908
ABSTRACT:
A breathing regulator includes a pressure-responsive piston which acts directly on a valve seat to open a pressurized gas pilot valve during inhalation. The same piston provides an outlet for exhalation. The piston is moved to open the pilot valve by inhalation suction. A one-way valve automatically blocks the exhalation path during inhalation. The outlet for the pressurized gas provides an injector nozzle effect to reduce the effort required to actuate the valve during inhalation. The preferred embodiment of the invention incorporates the regulator in a resuscitator or respirator for medical applications. In this embodiment, a mechanism is included for controlling the amount of inhalation back pressure in the patient's air passages which will close the pressurized gas valve and open the exhaust passage in the regulator. This mechanism includes an adjustable spring-loaded pressure plate on the external side of the piston. The inhalation pressure adjusting mechanism also provides for positive end expiratory pressure. In another embodiment, the basic regulator is adapted for use as a breathing regulator for high altitude aviation. In this embodiment, the invention includes aneroid bellows which close an ambient air inlet when a predetermined altitude is reached, so that breathing is exclusively from a pressurized gas source. The aviation embodiment also provides for pressurized breathing.
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