Importance

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Abstract

A respiration assistor (10) for use in an anaesthesia breathing system. The respiration assistor is intended to provide respiratory assistance for a patient (14) who is breathing spontaneously under anaesthesia in order that the patient's end-expired CO.sub.2 will be maintained at or near the normal physiological level. For this purpose, the respiration assistor incorporates a blower (15) which is located in series with a gas flow detector (20 or 39) and an electric control circuit (19) is provided for activating the blower (15) when inspired gas flow is detected by the detector (20 or 39). Also, the respiration assistor incorporates an expiratory valve (23) that is actuated to a closed condition when the blower is activated. The respiration assistor is intended to be activated as and when required by an anaesthetist to provide in-phase respiratory assistance to a patient who is breathing spontaneously and, in any case, the respiration assistor remains in-circle with and does not affect the normal function of an associated circle absorber.

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First Claim