An anaesthetic apparatus and a method for use with an anaesthetic apparatus

摘要

A anaesthetic machine comprising a control unit (18) and a breathing circuit (2) with a connector (14) for fresh gas, a bellows system (28) and an outlet valve (32). Said anaesthetic machine is devised to operate at least as an open system, the connector (14) then constituting an inspiratory part (6) of the breathing circuit (2) and the bellows system (28) and outlet valve (32) constituting an expiratory part (20) of the breathing circuit (2), are described. In order to reduce the adverse impact of compressible volume in the expiratory section (20) on the anaesthetic machine's function, the anaesthetic machine is devised in a special manner. The control unit (18) is accordingly devised to regulate the bellows system (28) during inspiration in such a way that a counter pressure, largely corresponding to the pressure of fresh gas at the connector (14), is maintained in the expiratory section (20) of the breathing circuit (2).