PERFORMANCE OF THE QUANTIFLEX MONITORED DIAL MIXER

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Abstract
The Quantiflex is designed to dispense mixtures of nitrons oxide and oxygen as an alternative to a Rotameter block. It incorporates separate mixture and total flow rate controls with two monitoring flowmeters. The two controls have been found to have negligible interaction and the delivered oxygen concentration is sufficiently close to the mixture control setting for safety requirements over a wide range of conditions during anaesthesia, including variations in gas input and output pressures. Within ±20% of the specified input pressure (4 arm gauge) delivered oxygen concentrations ranged from 3% below to 4% above the mixture control setting. Concentrations up to 5% above the setting were obtained with the combination of low total gas flow rates (2 l./min) and the output resistance afforded by a Manley ventilator and Fluotec Mark 3 vaporizer in series. Under no circumstances did the apparatus deliver an oxygen concentration which was below the mixture control setting by a clinically significant margin.

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