The invention relates to a system that includes: a insufflator (1) provided with a gas inlet (2), a valve (3) that regulates the flow to be supplied, an adjustable heater (4) for the gas to be supplied, a sensor (5) that detects the temperature of the heated gas, an outlet (6) for supplying the gas, and means (7) for propelling the gas toward the supply outlet (6); a disposable supply duct (8) that can be coupled to the gas outlet (6) for the insufflator (6) in order to convey the heated gas into the patient; and a return duct (9) for the gas, connected to a distal area of the supply duct (8) and to an inlet of the heater (4), wherein the gas supply duct (8) and the gas return duct (9) form a continuous recirculation circuit for heated gas.本発明は、気体入口(2)と、供給される流量を調節する弁(3)と、供給される気体のための調整可能な加熱器(4)と、加熱気体の温度を検知するセンサ(5)と、気体を供給するための出口(6)と、気体を供給出口(6)に向けて推進するための手段(7)とを備えた注入器(1)、加熱気体を患者の体内に運ぶために注入器(6)の気体出口(6)に結合可能な使い捨て給気ダクト(8)、および給気ダクト(8)の遠位領域と加熱器(4)の入口とに接続される還気ダクト(9)を備え、給気ダクト(8)と還気ダクト(9)は加熱気体のための連続再循環回路を形成するシステムに関する。【選択図】図1