Abstract
An increasing dissatisfaction with available equipment for the vaporization of liquid anesthetics led to a focused effort to design a new and improved vaporizer. Deficiencies in existing apparatus were identified as a lack of vernier control over small increments for gradually increasing the concentration of the vapor, and the lack of a steady reproducible vapor output due to the wide variation in temperature of the vaporizing liquid Therefore a new apparatus has been designed to provide reproducible conditions for effective vaporization and vernier control over small increments in concentration of vapor offered to the patient. The important modifications for attaining these desired conditions are in the circuit design, the liquid container, and the vaporizing surface. Since there are still many occasions for which liquid anesthetics are being used as the agent of choice, it seems desirable to have available a device that provides the physician with discrete control over the vapor volumes and concentrations of these agents.
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