A bone anchoring device with a shank (2,102,202) to be anchored in a bone or vertebra, a head (3,103,203), and a receiving part (4) receiving the head (3,103,203) for connecting the shank (2,102,202) to a rod is provided. The shank (2,102,202) and the head (3,103,203) are separate parts. The head (3,103,203) has a bore (31,131,231) with a cylindrical inner surface, a ring-shaped groove (34,134,234) provided on the inner surface, and at least one slit (35,135,235) extending from the inner surface to the outer surface (30,130,230) of the head (3,103,203). The shank (2,102,202) has a first portion (21,121,221) for anchoring in the bone or vertebra and a second portion (23,123,223) with a cylindrical outer surface adjoining a free end (27,127,227). A projection (7,107) is provided on the cylindrical outer surface which engages with the ring-shaped groove (34,134,234) of the head (3,103,203), when the cylindrical second portion (23,123,223) of the shank (2,102,202) is inserted in the bore (31,131,231) of the head.(Fig. 2)一種骨骼固定裝置,設有要固定於骨骼或椎骨之幹部(2,102,202)、頭部(3,103,203),以及容納件(4),容納頭部(3,103,203),把幹部(2,102,202)連接於桿。幹部(2,102,202)和頭部(3,103,203)是分開組件。頭部(3,103,203)具有圓筒形內表面之腔孔(31,131,231),設在內表面之環狀凹溝(34,134,234),以及至少一開縫(35,135,235),從頭部(3,103,203)的內表面延伸到外表面(30,130,230)。幹部(2,102,202)有第一部(21,121,221),供固定於骨骼或椎骨;第二部(23,123,223),其圓筒形外表面鄰接自由端(27,127,227)。圓筒形外表面設有凸部(7,107),當幹部(2,102,202)的圓筒形第二部(23,123,223)插入頭部之腔孔(31,131,231)內時,即與頭部(3,103,203)之環狀凹溝(34,134,234)結合。1...骨骼固定元件2...幹部3...頭部4...容納件5...加壓元件7...環40...容納件第一端41...容納件第二端42...縱向腔孔44...U形凹部45,46...股部47...陰螺紋50...加壓元件上側51...加壓元件下側52...凹部53...腔孔60...桿61...保固元件
