Installation it is locked in the medullary nail itself 1 which is interposed in the medullary cavity of the femur B which fractures, blade 2 for bone fixing because large sclerite B1 and the small sclerite B2 which form the particular femur are locked, being formed by the cylinder shape, it becomes, it is formed according to lap the direction of the blade for particular bone fixing, it finishes from the surface facing toward inside and the notch 23a which is lacked three it possesses the notch formation department 231 which, is provided in order inside each of the large sclerite and the small sclerite notch formation department 231 fracture belt L compared to be located on inner part side, being pressed in, it becomes.骨折した大腿骨Bの髄腔に挿入される髄内釘本体1に取付固定され、当該大腿骨を構成する大骨片部B1及び小骨片部B2を固定するための骨固定用ブレード2であって、棒状に形成されてなり、当該骨固定用ブレードの周方向に沿って形成され、表面から内側に向かって切り欠かれた切欠部23aが3つ設けられた切欠部形成部231を具備し、大骨片部及び小骨片部の各々の内側に切欠部形成部231が骨折線Lよりも奥側に位置するように圧入されてなる。
