Breathing gas system, preferably an anaesthesia system

摘要

A breathing gas system (2), primarily intended for use during anaesthetisation of patients, is described. The breathing gas system (2) has a respiratory circuit (4), a drive gas apparatus (8) and a pressure-transmitting bellows device (6), connected by a first space (20) to the respiratory circuit (4) and by a second space (22) to the drive gas apparatus (8). When an outlet valve (26) is regulated at the end of an expiratory phase to minimize the pressure difference between the first space (20) and the second space (22), the respiratory circuit (4) responds immediately at the next inspiratory phase when drive gas is sent to the second space (22). Minimizing the pressure difference also makes possible use of the pressure-regulated operating mode with the breathing gas system (2), and a rapid response to attempts at spontaneous breathing by the patient is obtained.