PROBLEM TO BE SOLVED: To provide an introduction assisting tool having a side hole provided thereto which can prevent a damage on a wall of a tubular organ when a medical tool is introduced within the tubular organ through the side hole and then the introduction assisting tool is removed from the tubular organ while maintaining the medical tool within the tubular organ.SOLUTION: An introduction assisting tool 11 having a side hole is provided with a tubular body 13 which is inserted into a tubular organ of a patient. On a peripheral wall of the tubular body 13, there is provided a side hole 25 having a size for allowing a medical tool T to be passed through. The medial tool T inserted into the tubular body 13 can be extended outwardly from the tubular body 13 through the side hole 25 of the tubular body 13. The tubular body 13 includes a main tubular body 21 and a distal tubular body 23 which is located on a distal side of the main tubular body 21 and has an outer diameter that is smaller than that of the main tubular body 21, in which a side hole 25 is provided to the distal tubular body 23.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】側孔が設けられている導入補助器具を用い、側孔を通して管状器官内に医療器具を導入した後に、医療器具を管状器官内に留置したまま導入補助器具を管状器官から抜去するときの管状器官壁の損傷を抑制する。【解決手段】側孔付き導入補助器具11は、患者の管状器官内へ挿入するための管状体13を備え、管状体13の周壁に、医療器具Tの通過を許容する大きさの側孔25が設けられており、管状体13内に挿通された医療器具Tを、管状体13の側孔25を通して管状体13の外部へ延出させることができる。管状体13は、本管部21と、本管部21の遠位側に位置し且つ本管部21よりも細い外径を有する遠位管部23とを備え、側孔25が遠位管部23に設けられている。【選択図】図1
