PROBLEM TO BE SOLVED: To prevent a connector detachably attached to a syringe from being erroneously detached or broken.SOLUTION: A connector 2 is attached to a port 5 formed on the front end of a syringe body 3, and has a cylindrical member 10 and an arc-like member 20. A convex portion 7 is formed on the outer peripheral surface of the port 5. The cylindrical member 10 has a cylinder body 11 having a female screw 12, and an annular plate 14 connected to the rear end of the cylinder body 11. A concave portion 15 to which the convex portion 7 is engaged oppositely in a circumferential direction is provided on the inner peripheral surface of the annular plate 14 so that the rotational movement of the cylindrical member 10 to the port 5 is regulated. The arc-like member 20 has a first arc-like plate 21 facing the convex portion and the rear surface of the annular plate 14, a second arc-like plate 22 facing the front end of the outer peripheral end of the annular plate 14, and a coupling portion 23 for coupling the outer peripheral ends of the two arc-like plates.COPYRIGHT: (C)2014,JPO&INPIT【課題】シリンジに着脱可能に取り付けられた接続具の誤脱と破損を防止する。【解決手段】接続具2は、シリンジ本体3の前端に設けられた口部5に取り付けられ、筒部材10と円弧状部材20とを有する。口部5の外周面には、凸部7が設けられている。筒部材10は、メスネジ12を有する筒本体11と、筒本体11の後端に接続された環状板14とを有する。環状板14の内周面には、筒部材10の口部5に対する回転移動を規制するように、凸部7が周方向に対向して係合する凹部15が設けられている。円弧状部材20は、凸部および環状板14の後面と対向する第1円弧板21と、環状板14の外周端部の前面と対向する第2円弧板22と、2つの円弧板の外周端同士を連結する連結部23とを有する。【選択図】図2
