Importance

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Abstract

Respiratory anesthesia device comprising a gas circuit (1) comprising an inhalation branch for conveying a mixture of anesthetic gas to connection means (24) intended to be connected to the upper airways of a patient (11); an exhalation branch (3) for conveying a gaseous mixture containing CO.sub.2 exhaled by said patient (11); said inhalation branch (2) and said exhalation branch (3) forming a looped gas circuit (1). A line (8) supplying fresh gas, in fluidic communication with the gas circuit (1) is intended to supply said circuit (1) with fresh gas. Furthermore, a relief valve (4) with an adjustable pressure set-point value is arranged on the inhalation branch (2) or on the exhalation branch (3) and means for controlling the relief valve (4) acting on the relief valve (4) in response to the detection of a variation in flow rate and/or pressure of the fresh gas inside the fresh gas supply line (8) so as to adjust the pressure set-point of the relief valve (4).

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First Claim