PROBLEM TO BE SOLVED: To prevent a connector detachably attached to a syringe from being erroneously detached or broken.SOLUTION: A connector 2 has an inner cylindrical member 10 attached to a port 5 of a syringe body 3, and an outer cylindrical member 40 fitted to the inner cylindrical member. A concave portion 7 forming a polygon when viewed in an axial direction is arranged on the outer peripheral surface of the port 5. The inner cylindrical member 10 has an inner cylinder body 20, and an engaging plate 30 protruding from the inner peripheral surface of the inner cylinder body and engaging with the concave portion 7, and also has a plurality of slits 11 formed radially to an axis from the engaging plate 30 over a part of the inner cylinder body. Engagement between the concave portion 7 and the engaging plate 30 regulates the movement of the inner cylindrical member 10 to the syringe body 3 in peripheral and axial directions. In a state where the outer cylindrical member 40 is not attached to the inner cylindrical member 10, the engaging plate 30 can be displaced in a diameter expansion direction, and in a state where the outer cylindrical member 40 is attached to the inner cylindrical member 10, the inner peripheral surface of the outer cylindrical member abuts onto the outer peripheral surface of the inner cylindrical member, thereby regulating the displacement of the engaging plate 30 in the diameter expansion direction.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の口部5に装着される内筒部材10と、内筒部材に嵌合される外筒部材40とを有する。口部5の外周面には、軸方向から見て多角形状の凹部7が設けられている。内筒部材10は、内筒本体20と、内筒本体の内周面から突出し、凹部7と係合する係合板30とを有すると共に、係合板30から内筒本体の一部にかけて軸に対して放射状に複数のスリット11が形成されている。凹部7と係合板30との係合により、内筒部材10のシリンジ本体3に対する周方向および軸方向の移動が規制される。内筒部材10に外筒部材40が装着されていない状態では、係合板30が拡径方向に変位可能であって、内筒部材10に外筒部材40が装着された状態では、外筒部材の内周面が内筒部材の外周面に当接することにで、係合板30の拡径方向の変位が規制される。【選択図】図2
