An intramedullary nail assembly to fix a bone is disclosed, which comprises: a bone nail disposed inside the bone, and made by a first metal, and having at least a via hole and at least a screw made of a second metal to penetrate through the bone and said via hole for achieving the purpose of stabilizing and fixing a bone fracture part, wherein the first metal has a lower notch sensitivity than that of the second metal, while the second metal has a higher mechanical strength than that of the first metal.一種骨髓內釘組合,用以固定一骨骼,其具有:一骨釘,用以置於該骨骼內部,其係由第一金屬製成且具有至少一貫孔;以及至少一螺絲,其係由第二金屬製成,用以穿過該骨骼及所述貫孔以完成穩定、固定一骨折部位之目的,其中該第一金屬具有比該第二金屬低之凹口敏感度,而該第二金屬則具有比該第一金屬高之機械強度。10...骨釘11...貫孔20...螺絲
