PROBLEM TO BE SOLVED: To provide a treatment instrument capable of being easily inserted when the treatment instrument is re-inserted into a bile duct.SOLUTION: A treatment instrument 1, which is extended in a longitudinal direction to be inserted into the body cavity along the longitudinal direction, includes a first balloon 15 which is provided at a tip to maintain a position within the body cavity, and a second balloon 16 which is provided to be freely movable along the longitudinal direction between the tip and a base end and which can be expanded and contracted.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2017,JPO&INPIT【課題】 処置具を胆管内へと再度挿入する際に、容易に挿入可能な処置具を提供する。【解決手段】 長手方向に伸び、長手方向に沿って体腔内に挿入される処置具1において、先端部に設けられ、体腔内における位置を保持する第1バルーン15と、先端と基端との間で前記長手方向に沿って移動自在に設けられた、拡張及び収縮が可能な第2バルーン16と、を具備する。【選択図】図5
