PROBLEM TO BE SOLVED: To prevent penetration or damages of a housing by interrupting movement in an advancing direction of a movable needle by a simple configuration.SOLUTION: A catheter assembly 10 includes an inner cylinder 70, an inner needle 20 freely movable forward and backward relative to the inner cylinder 70, and a shutter member 60 for interrupting the advance movement of the inner needle 20. The inner cylinder 70 has an internal space 72a for arranging the shutter member 60 on the moving route of the inner needle 20. The shutter member 60 is constituted of a deformation part 66 which can be extended to the internal space 72a so as to close the moving route of the inner needle 20 when the inner needle 20 is moved backward, and a fixed part 62 positioned and fixed to the internal space 72a and supporting extension of the deformation part 66.COPYRIGHT: (C)2013,JPO&INPIT【課題】簡単な構成によって可動針の進出方向の移動を遮断しハウジングの貫通や破損を防止する。【解決手段】カテーテル組立体10は、内筒70と、内筒70と相対的に進退自在な内針20と、内針20の進出移動を遮断するシャッタ部材60と、を備える。内筒70は、内針20の移動経路上でシャッタ部材60を配置する内部空間72aを有する。シャッタ部材60は、内針20が後退移動したときに、内針20の移動経路を塞ぐように内部空間72aに延出可能な変形部66と、内部空間72aに位置決め固定され変形部66の延出を支持する固定部62とによって構成されている。【選択図】図5
