Volatile anesthetic vaporizing apparatus

Gas and liquid contact apparatus – Fluid distribution – Valved

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Details

128188, 137 79, 261 55, 261 63, 261 64R, 261104, 261107, 261119R, 261DIG65, B01F 304, A61M 1700

Patent

active

041296214

ABSTRACT:
A volatile anesthetic vaporizing apparatus including a concentration control flow valve means actuated by a substantially linear rotary dial for dividing an inflowing gas stream into two separate streams, one stream being passed over liquid anesthetic to pick up a vapor and the other stream flowing through a bypass duct. The gas stream flowing over liquid anesthetic flows through a temperature responsive valve means, the latter being actuated by a temperature sensitive bimetallic strip which is in direct contact with the vapor saturated air stream which is relatively cool due to the vaporization of the liquid anesthetic. The valve means so situated in the vapor stream essentially does not include any moving parts. Such valve means is formed by the spaced mounting of a planar valve element on a planar surface having a vapor opening therein or an inlet passage. The planar valve element has a portion of material removed therefrom and being in contact with a bimetallic strip tends to pivot about the removed portion thereof in response to temperature changes in the vapor saturated stream flow. Such a valve structure avoids problems of sticking, provides substantially laminar flow therethrough and automatically compensates for changes in the temperature of vapor saturated air stream as it leaves the vaporizing chamber apparatus once the volumetric anesthetic percentage has been set on the aforesaid rotary dial to maintain such percentage concentration constant over a substantial temperature range.

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