Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1990-09-18
1993-04-06
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820211, 12820426, 12820429, 137 811, A62B 902, A62B 1700, A61M 1600, F16K 1736
Patent
active
051994267
ABSTRACT:
Aircraft aircrew life support apparatus has a G-protection garment inflation pressure control valve disposed in a common body with a breathing demand regulator. Inflation pressure output by the garment inflation pressure control valve is ducted within the body to be directly applied as an operating force to a valve controlling outflow from a breathing-pressure control chamber of the regulator whereby positive pressure breathing obtains in the presence of G-load. The garment inflation pressure control valve comprises a pressure balanced valve adapted to be displaced against the bias of a spring in an opening direction by a pneumatic actuator. The pneumatic actuator is controlled by signals from an accelerometer sensing G-load for inflation of the garment when the aircrew member is subject to high G-load (typically in excess of 2G) and by signals from a cabin pressure sensor for inflation of the garment if the aircrew member is exposed to high altitude (typically in excess of 12000 metres). The pneumatic actuator is subject to feedback control responding to garment inflation pressure.
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"G-loc: taming the killer", Flight International, Mar. 28, 1987.
Aldworth Alec J.
Foote James C.
Asher K. L.
Burr Edgar S.
Normalair-Garrett (Holdings) Ltd.
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