Abstract
We report the bench testing of three new anaesthesia ventilators : Flexima™ (Datex), SA2/RA2™ and Cato™ (Dräger). The test circuit included a two compartment lung model, a pneumotachograph and a pressure gauge. Volume was integrated from flow signal. The tidal volume delivered by the Flexima™ and SA2/RA2™ ventilators decreased with increasing mechanical work load contrarily to the Cato™. Moreover, the tidal volume of the Flexima™ increased with the fresh gas flow. In spontaneous ventilation inspiratory resistance were low.
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