Electrically controllable anesthesia vaporizer

Details Electrically controllable anesthesia vaporizer Electrically controllable anesthesia vaporizer

1985-12-16

1988-09-13

Coven, Edward M.

Surgery

Respiratory method or device

Means for mixing treating agent with respiratory gas

12820314, 12820327, A61M 1600

Patent

active

047701684

ABSTRACT:
A vaporizer has a main conduit supplied at an inlet end by a carrier gas of oxygen and nitrous oxide having a constant flow rate. The outlet end of the conduit is connected to the breathing system of a patient. A series circuit with an input end connected to a proximal port in the conduit includes a check valve, a chamber in which anesthetic vapor is maintained in saturation and a positive displacement pump driven by an electrical motor for pumping the vapor-saturated gas at a rate that is only a function of an electrical signal applied to the motor. The output of the pump is connected to a distal port of the conduit. More than one such chamber may be provided, each containing a different liquid anesthetic, and any one being connected into the circuit by means of a selector valve.

REFERENCES:
patent: 2872167 (1959-02-01), Pratt
patent: 4127121 (1978-11-01), Westenskow et al.
patent: 4150670 (1979-04-01), Jewett et al.
patent: 4345612 (1982-08-01), Koni et al.
patent: 4434790 (1984-03-01), Olesen
patent: 4576159 (1986-03-01), Hahn et al.
patent: 4611590 (1986-09-01), Ryschka et al.
Coles et al., "Computer Control of Respiration and Anaesthesia", Medical and Biomedical Engineering, May 1973.

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