Pump flow vaporizer
AssigneeOhmeda Inc.
InventorJames N. Mashak
Life of this patent
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Abstract
A vaporizer for introducing a vapor of an anesthetic liquid into t carrier gas for introduction into a patient is disclosed. The vaporizer directly vaporizes the liquid by introducing the liquid into a vaporizing chamber having an extremely large width to height ratio, i.e. in excess of 600:1. The carrier gas flows in laminar flow through the vaporizing chamber and the liquid anesthetic is introduced at a controlled flow such that it immediately vaporizes upon introduction to the entrance of the vaporizing chamber. A control scheme utilizing a CPU controls the percentage of anesthetic vapor in the outlet gas by sensing certain parameters and then controlling the flow of liquid anesthetic by controlling the speed of a controllable speed pump.
Claims11
An anesthetic vaporizer comprising an inlet for receiving carrier gas and an outlet for carrier gas and vaporized anesthetic agent for delivery to a patient, a vaporizing chamber forming a flow path between said inlet and said outlet, said vaporizing chamber comprising an elongated chamber having a large width to height ratio and forming a flow field for the flow of carrier gas therethrough, a liquid anesthetic agent inlet in said vaporizing chamber for admitting liquid anesthetic agent at a predetermined location into the flow of carrier gas through said vaporizing chamber, means for supplying liquid anesthetic agent to said liquid anesthetic agent inlet, and means for controlling the flow of the anesthetic agent supplied to said liquid anesthetic agent inlet to effect an immediate vaporization of the liquid anesthetic agent in said vaporizing chamber to control the concentration of vaporized anesthetic agent in the carrier gas delivered through said outlet to the patient.
Dependencies are inferred from the claim text.