PROBLEM TO BE SOLVED: To surely prevent dispersion of body fluid or the like stuck to a treatment instrument when taking out the treatment instrument from a proximal operation section.SOLUTION: A male screw section 50 is formed at a flexible cord section 41 of a treatment instrument 11. A female screw section 55 to be threadedly engaged with the male screw section 50 is formed at a forceps plug 36 of the proximal operation section 12 of an endoscope. When the treatment instrument 11 is used, the male screw section 50 is rotated to be inserted. When the treatment instrument 11 is pulled out after finishing the treatment, the male screw section 50 is locked to the female screw section 55 of the forceps plug 36 to temporarily stop the pullout operation of the treatment instrument 11. After that, the treatment instrument 11 is rotated to threadedly engage the male screw section 50 with the female screw section 55, and the treatment instrument 11 is slowly pulled out from the forceps plug 36. The treatment instrument 11 is thus eliminated from being vigorously pulled out when demounting, thereby preventing the dispersion of the body fluid or the like stuck to the treatment instrument 11.COPYRIGHT: (C)2012,JPO&INPIT【課題】手元操作部から処置具を取り出す際に、処置具に付着した体液などの飛散を確実に防止する。【解決手段】処置具11の可撓性コード部41に雄ねじ部50を形成する。内視鏡の手元操作部12の鉗子栓36に、雄ねじ部50に螺合する雌ねじ部55を形成する。処置具11を使用する際には、雄ねじ部50を回転させて挿入する。処置終了後に、処置具11を抜き取る際には、雄ねじ部50が鉗子栓36の雌ねじ部55に係止し、処置具11の抜き取り操作を一時停止する。この後、処置具11を回転させて雄ねじ部50と雌ねじ部55とを螺合させてゆっくりと処置具11を鉗子栓36から抜き取ることができる。処置具11の抜き取りの際に勢い余って処置具11が抜き取られることがなくなり、処置具11に付着した体液等が飛散することがなくなる。【選択図】図2
