PROBLEM TO BE SOLVED: To provide an intramedullary nail capable of adjusting the fixing force by operation without requiring a complicated structure for fixing a bone screw in an intramedullary nail body, and allowing surgery to be easily performed with high operability thereof.SOLUTION: An opening 121c corresponding to a horizontal hole 115 is disposed in an engagement member 121 disposed within a shaft hole 113 of the intramedullary nail body which includes the shaft hole 113 and the horizontal holes 114 and 115. The opening 121c has a shape of opening, extended in the direction of an axis 100X longer than the shape of opening of the horizontal hole 115. An inclined edge inclined relative to the axis 100X is formed in the inner side edge on one side of the opening 121c. When the engagement member 121 is moved along the axis 100X, an abutting point of the inclined edge abutting on an insertion part of the bone screw is relatively moved to the opposite side on a side, and the insertion part receives the compression force between the inner side edge on the one side of the opening 121c and the inner side edge on the opposite side of the horizontal hole 115, or the compression force is increased according to the inclination of the inclined edge.COPYRIGHT: (C)2013,JPO&INPIT【課題】髄内釘本体に骨ねじを固定するための複雑な構造を不要とし、操作による固定力の調整が可能で高い操作性を有することにより手術を容易に行うことができる髄内釘を提供する。【解決手段】軸穴113及び横孔114、115を備えた髄内釘本体の軸穴113内に配置される係合部材121には横孔115に対応する開口部121cが設けられ、開口部121cは、横孔115の開口形状よりも軸線100Xの方向に延長された開口形状を備えるとともに、開口部121cの一側の内側縁には軸線100Xに対して傾斜した傾斜縁部が形成され、係合部材121が軸線100Xに沿って移動すると、骨ねじの挿通部位に当接する傾斜縁部の当接点が側方の逆側に相対移動し、当該挿通部位が開口部121cの一側の内側縁と横孔115の逆側の内側縁との間で挟圧力を受けるか、或いは、傾斜縁部の傾斜に応じてその挟圧力が増大する。【選択図】図2
