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British Journal of Anaesthesia, 1986, Vol. 58, No. 10 1161-1166
© 1986 The Board of Management and Trustees of the British Journal of Anaesthesia

other

A MICROPROCESSOR-CONTROLLED ANAESTHETIC VAPORIZER

C. E. W. HAHN, M.A., B.SC., M.SC., D.PHIL., E. PALAYIWA, M.A., B. R. SUGG, B.SC.ENG. and D. LINDSAY-SCOTT

Nuffield Department of Anaesthetics, John Radcliffe Hospital Headington, Oxford OX3 9DU
Penlon Limited Radley Road, Abingdon, Oxon

A microprocessor-controlled anaesthetic vaporizer is described. Fresh gas is mixed in the correct proportions using two pulsed solenoid valves and a proportion of this passes through a third pulsed solenoid valve and is bubbled through liquid halothane. The temperature of the liquid agent is measured and the pulse frequency is modified to give the correct vapour concentration for the set flow rate and measured temperature. Initially, the vapour was produced by bubbling fresh gas through the agent in a conventional halothane bottle. However, because of the large liquid volume available, nitrous oxide was found to dissolve in large quantities in the halothane. A small volume vaporizer which was continually replenished from a reservoir was designed. Measurements of the vapour concentrations emerging from such a vaporizer were made and were found to agree with the set values ±0.1% v/v.


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