Suction device for anaesthetic gases

摘要

The invention relates to a suction device for anaesthetic gases in high-frequency ventilation, in which the anaesthetic gas set at a specific pressure can be delivered via a ventilation tube in a pulsed manner by means of a solenoid valve, the solenoid valve being controllable by electrical signals from a generator, these signals being adjustable in terms of frequency and pulse duty factor. So that the exhaled anaesthetic gases can no longer escape freely into the environment, but instead can be collected and if appropriate neutralised, it is possible to couple to the ventilation tube the input connection of a solenoid valve, which can be controlled by the electrical signals and to whose output connection a low pressure source is coupled. The solenoid valve has an intermediate chamber of pressure-dependent volume. The intermediate chamber can be connected via an outlet valve to the output connection in the inspiration phase and via an inlet valve to the input connection in the expiration phase. <IMAGE>