Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1996-05-16
1998-05-26
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820511, 12820524, 12820325, A61M 1500
Patent
active
057552207
ABSTRACT:
A flow adjusting valve for an anesthetic device has adjusting valves for an anesthetic gas other than oxygen, as well as for oxygen, respectively, both being contained in a valve main body. The valve main body has first and second valve seat chambers, first and second stopper edges, and first and second valve chambers arranged in the described order from an inlet side for respective adjusting valves. A bypass of restricted flow amount is provided in the oxygen adjusting valve. It has an inlet which opens into an inside on an upstream side of the second valve seat chamber and which communicates with a discharge passage through the valve main body. First and second movable valve seats with first and second central valve openings are slidably contained in the valve seat chambers and are pushed by first and second springs against the stopper edges. First and second valve members are arranged inside the first and second valve chambers such that the movable valve seats are moved towards the inlet side against the springs after the central valve openings have been closed. The inlet of the bypass is thus closed when the second movable valve seat is moved towards the inlet side, and is opened when moved in the opposite direction.
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