PROBLEM TO BE SOLVED: To provide a pneumoperitoneum apparatus capable of preventing overpressure inside the abdominal cavity to thereby provide a more optimal surgical environment even when a lens surface is being washed.SOLUTION: A pneumoperitoneum apparatus 3 comprises: a pipeline 40 in communication with a cap 3c which is connected to a carbon dioxide cylinder 7 a pneumoperitoneum pipeline 42 for connecting the pipeline 40 and a pneumoperitoneum air supply cap 3a a cleaning pipeline 43 for connecting the pipeline 40 and a cleaning air supply cap 3b an electromagnetic valve/relief valve 45 disposed on the pneumoperitoneum pipeline 42 a flow rate sensor 50 which is disposed on the cleaning pipeline 43 and detects the flow rate of carbon dioxide gas supplied from the carbon dioxide cylinder 7 and a control unit 51 which exerts control so as to place the electromagnetic valve of the electromagnetic valve/relief valve 45 in a closed state or the relief valve in an open state when the flow rate of the carbon dioxide gas detected by the flow rate sensor 50 exceeds a predetermined threshold value.COPYRIGHT: (C)2015,JPO&INPIT【課題】レンズ面の洗浄を実施しても腹腔内部の過圧を防ぐことができ、より最適な手術環境を提供することができる気腹装置を提供する。【解決手段】気腹装置3は、炭酸ガスボンベ7が接続される口金3cに連通する管路40と、管路40と気腹用送気口金3aとを連通する気腹用管路42と、管路40と洗浄用送気口金3bとを連通する洗浄用管路43と、気腹用管路42上に設けられた電磁弁/リリーフ弁45と、洗浄用管路43上に設けられ、炭酸ガスボンベ7から供給される炭酸ガスの流量を検知する流量センサ50と、流量センサ50で検知された炭酸ガスの流量が所定の閾値を超えた場合、電磁弁/リリーフ弁45の電磁弁を閉状態またはリリーフ弁を開状態とするように制御する制御部51と、を有する。【選択図】図5
