PROBLEM TO BE SOLVED: To reduce the invasion to a patient and to realize a strong joint with a bone, a medical device structure for dentistry, head and neck surgery and orthopedic surgery, and a method for joining a medical device to a bone. I will provide a. A medical device (10) is a hollow shaft part that is inserted into cortical bone that constitutes bone or that penetrates the cortical bone and is inserted to a position reaching the cancellous bone on the inner side of the cortical bone. 10A and bent portions 10B, 10C that are bent radially outward from one axial end of the shaft portion and are exposed on the surface of the cortical bone, or radially outward from one axial end portion of the shaft portion. And an exposed portion that is exposed on the surface of the cortical bone. [Selection diagram] Figure 1【課題】患者への侵襲が小さく、骨との強固な接合を実現することができる医療用デバイス、歯科用、頭頸部外科用及び整形外科用デバイス構造、並びに骨への医療用デバイスの接合方法を提供する。【解決手段】医療用デバイス１０は、骨を構成する皮質骨の内部に差し込まれる、又は前記皮質骨を貫通し、前記皮質骨の奥側の海綿骨に達する位置まで差し込まれる中空形状の軸部１０Ａと、前記軸部の軸方向の一端部から半径方向外側に屈曲され、前記皮質骨の表面に露出する屈曲部１０Ｂ，１０Ｃ、又は、前記軸部の軸方向の一端部から半径方向外側に延在される部分を有し、前記皮質骨の表面に露出する露出部と、を有する。【選択図】図１
