Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1991-07-31
1993-09-21
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820418, 12820517, A62B 902
Patent
active
052459969
ABSTRACT:
A valve for an anaesthetic rebreathing system includes a valve body, a selector member situated within the valve body and a relief valve which forms an integral part of the valve. The valve can be converted from a Mapleson A to a Mapleson D configuration and from a Mapleson A or D configuration to a Mapleson E configuration. The valve body includes a fresh gas inlet, a fresh gas outlet, a fresh gas conduit in communication with the fresh gas inlet and a fresh gas outlet, an expired gas inlet/outlet port, a waste gas outlet, an expired gas conduit in communication with the expired gas inlet/outlet port and the waste gas outlet, a reservoir bag or ventilator inlet/outlet port and a reservoir bag or ventilator conduit in communication with the reservoir bag or ventilator inlet/outlet port, the conduits converging at a node within which the selector member is movable to isolate the expired gas inlet/outlet port and the waste gas outlet from the reservoir bag or ventilator inlet/outlet port in a first position thereof and to isolate the fresh gas inlet and the fresh gas outlet from the reservoir bag or ventilator inlet/outlet port in a second position thereof, the relief valve, which allows for control of pressure in the expired gas conduit, being adjustable between a first setting in which expired gas may flow freely out of the waste gas outlet and a second setting in which the waste gas outlet is completely occluded, and being adapted, in its second setting, to lock the selector member in the second position.
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Anaesthesia, 1983, vol. 38, pp. 361-372, Humphrey, "A New Anaesthetic Breathing System . . . ".
"The Johannesburg A-D Circuit Switch", pub. in The British Journal of Anaesthesia, (1979), 51, 1185.
Asher Kimberly L.
Burr Edgar S.
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