PROBLEM TO BE SOLVED: To provide a body organ expansion instrument using a self-expansion type stent to be efficiently started at the time of traction of a stent storage cylindrical member with very little meandering and kinking of the body organ expansion instrument at the time of traction.SOLUTION: The body organ expansion instrument 1 comprises a distal end tube 2, a proximal end tube 4 fixed to the proximal end of the tube 2, the stent storage cylindrical member 5 slidable toward the proximal end side, the self-expansion type stent 3 stored in the stent storage cylindrical member 5, and a traction wire 6 for moving the stent storage cylindrical member 5 toward the proximal end side. The stent storage cylindrical member 5 is moved on the outer surface of a fixed tube toward the proximal end side by the traction of the traction wire 6. The stent storage cylindrical member 5 has a hard material cylindrical proximal end member 54 fixed to the proximal end and having the inner surface to be brought into contact with the outer surface of the fixed tube 8 when moved to the proximal end side.COPYRIGHT: (C)2009,JPO&INPIT【課題】自己拡張型ステントを用いる生体器官拡張器具であって、ステント収納用筒状部材の牽引時における始動が良好であり、牽引時における生体器官拡張器具の蛇行、キンクの発生が極めて少ない生体器官拡張器具を提供する。【解決手段】生体器官拡張器具1は、先端側チューブ2と、このチューブ2の基端部に固定された基端側チューブ4と、基端方向に摺動可能であるステント収納用筒状部材5と、ステント収納用筒状部材5内に収納された自己拡張型のステント3と、ステント収納用筒状部材5を基端側に移動させるための牽引ワイヤ6を備える。ステント収納用筒状部材5は、牽引ワイヤ6の牽引により固定チューブ8の外面上を基端側に移動するものであり、かつ、基端に固定され、基端側への移動時に、固定チューブ8の外面と接触する内面を備える硬質材料製筒状基端部材54を備える。【選択図】図3
