PROBLEM TO BE SOLVED: To provide a catheter capable of preventing, for example, overexpansion of a balloon, caused by environmental changes in an organ, such as generation of carbon dioxide in the organ.SOLUTION: In the catheter 10, a catheter body 11 includes an introduction tube 20 and a catheter head 30 from which the introduction tube 20 is elongated. In the introduction tube 20, the inflatable/deflatable balloon 50 is provided at a leading end and a main lumen 21 for feeding liquid food etc. into the organs, and a sub-lumen 25 for introducing a fluid into the balloon 50 are formed. The catheter head 30 comprises an injection port 15 which communicates with the main lumen 21, a communication passage 32 which communicates with the sub-lumen 25, and a fluid introduction plug portion 31 which is openably/closably connected to the communication passage 32 and which is opened when a syringe I for injecting the fluid is inserted into the communication passage 32. The communication passage 32 and the outside of the catheter head 30 communicate with each other via a pressure control passage 35, so as to release excess pressure generated in the balloon 50.COPYRIGHT: (C)2012,JPO&INPIT【課題】臓器内で炭酸ガスが発生する等の臓器内の環境変化に起因するバルーンの過膨張等を防止することができるカテーテルを提供すること。【解決手段】カテーテル10は、カテーテル本体11が導入チューブ20と、該導入チューブ20が延設されたカテーテルヘッド30とから構成し、導入チューブ20は、先端部に拡張収縮可能なバルーン50を装備するとともに、流動食等を臓器内に送るメインルーメン21と、バルーン50へ流体を導通させるサブルーメン25とを形成し、カテーテルヘッド30は、メインルーメン21に通じる注入口15と、サブルーメン25に連通する連通路32と、該連通路32に開閉可能に接続され、該連通路32に流体を注入するためのシリンジIを挿着したときに開く流体導通栓部31とを設け、連通路32とカテーテルヘッド30の外部とを調圧路35で連通してバルーン50内に発生した過剰圧力を逃がす。【選択図】図1
