SOLUTION: A medical knife can take a projecting position in which a blade body of a movable body projects from a holder and an accommodated position in which the blade body is accommodated within the holder, according to first operation means or second operation means. Either an engaging part 30 of a stopper 28 engaged into one of both engaging holes 14 and 15 at the projecting position by energizing force of a first spring 26, or an engaging part 30 of the stopper 28 engaged into the other one of the engaging holes 14 and 15 at the accommodated position by energizing force of the first spring 26, moves in a first guide hole 16 against the energizing force of the first spring 26 together with an engaging/disengaging operation part 29 of the stopper 28 engaged into the first guide hole 16, or moves in a second guide hole 17 against the energizing force of a second spring 27 together with an engaging/disengaging operation part 29 of the stopper 28 engaged into the second guide hole 17.EFFECT: Projecting and retracting operation of the blade body from/into the holder is improved in convenience by employing the first operation means or the second operation means.SELECTED DRAWING: Figure 8COPYRIGHT: (C)2016,JPO&INPIT【解決手段】医療用刃物は、第一の操作手段または第二の操作手段により、可動体の刃体がホルダから突出する突出位置とホルダ内に収容される収容位置とを取り得る。突出位置で両係止孔14,15のうち一方に第一のばね26の付勢力により係入されたストッパ28の係止部30と、収容位置で両係止孔14,15のうち他方に第一のばね26の付勢力により係入されたストッパ28の係止部30とのうちいずれかが、第一のばね26の付勢力に抗して第一の案内孔16に係入されたストッパ28の係脱操作部29とともに第一の案内孔16を移動するか、または、第二のばね27の付勢力に抗して第二の案内孔17に係入されたストッパ28の係脱操作部29とともに第二の案内孔17を移動する。【効果】第一の操作手段または第二の操作手段の採用により、ホルダにおける刃体の出没操作をより便利にすることができる。【選択図】図8
