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  • Title: A microprocessor-controlled gas mixing device.
    Author: Palayiwa E, Hahn CE, Sugg BR, Lindsay-Scott D, Tyrrell PJ.
    Journal: Br J Anaesth; 1986 Sep; 58(9):1041-7. PubMed ID: 3756050.
    Abstract:
    This paper describes the use of solenoid valves for the production of binary gas mixtures. The system is controlled by a microprocessor and is capable of delivering accurate flows and concentrations of gases over the ranges commonly used in anaesthesia. Since the flow produced by the valves is pulsatile, a system for mixing the gases and smoothing the pulses is described. A back pressure regulator is fitted downstream of each of two mixing/damping chambers and a method of using this as a flow transducer is described. The advantages of this system over conventional rotameters are discussed.
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