Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1997-10-09
2000-02-15
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820314, 12820325, A61M 1500
Patent
active
060240873
ABSTRACT:
An emergency oxygen system that provides a flow of oxygen to the patient undergoing anesthesia in the event of a detected fault in the overall supply and mixing system of the anesthesia system. The normal design of such supply and mixing systems for an anesthesia system provides oxygen and at least one other gas that are mixed together in a desired proportion to be provided to a vaporizer and then to the anesthesia system as fresh gas. In the present system, a processor continuously monitors the output flows from those proportioning mixing valves. When the processor determines that those flows from the proportioning valves are off by a predetermined amount, indicative of a fault in the system, the processor immediately shuts off the supply of any gases other than oxygen and also provides a flow of oxygen to a bypass line that bypasses the oxygen proportioning valve, thus assuring a supply of oxygen to the patient despite the fault. A manual valve may be included in the bypass line so that the clinician can control the flow of oxygen and a flowmeter is provided so the clinician can visually note the flow and control that flow accordingly.
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Kersey Clifford G.
Montgomery Frederick J.
Sansom Gordon G.
Lewis Aaron J.
Ohmeda Inc.
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