PROBLEM TO BE SOLVED: To provide a treatment instrument insertion auxiliary tool capable of smoothly guiding a tip side of a treatment instrument in a center axis direction of an insertion opening of a treatment instrument channel.SOLUTION: A treatment instrument insertion auxiliary tool for assisting the insertion of a treatment instrument into a treatment instrument channel includes: a funnel-shaped treatment instrument guide part provided with a first opening connected to a treatment instrument channel opening, and a second opening having a bore larger than that of the first opening and a guide groove part formed on the entire inner peripheral surface of the funnel-shaped treatment instrument guide part for guiding a tip side of the treatment instrument in a center direction of the opening of the treatment instrument channel along the longitudinal direction of the funnel shape.COPYRIGHT: (C)2015,JPO&INPIT【課題】処置具の先端側を処置具チャンネルの挿入用開口部の中心軸方向に円滑にガイドすることができる処置具挿入補助具を提供する。【解決手段】処置具の処置具チャンネル内への挿通を補助するための処置具挿入補助具であって、処置具チャンネル開口部と接続される第1の開口部と、該第1の開口部よりも大きい口径を有する第2の開口部を備えた漏斗形状の処置具誘導部と、前記漏斗形状の処置具誘導部の内周面全体に形成され、該漏斗形状の長手方向に沿って、前記処置具の先端側を前記処置具チャンネルの開口部の中心方向へ誘導する誘導溝部と、を有する。【選択図】図1
