| 摘要 |
PROBLEM TO BE SOLVED: To provide a bone anchoring device wherein a shank and a head are separate parts. SOLUTION: The bone anchoring device comprises an anchoring element comprising a shank to be anchored in a bone or a vertebra and a head 15, the head has an exterior surface with a spherical segment-shaped portion, and the shank and the head are separate parts. The bone anchoring device has; a receiving portion 1 comprising a first end 2, a second end 3 opposite to the first end, a longitudinal axis 4 passing through the two ends, a bore 5 coaxial with the longitudinal axis, and a first region adjacent to the second end for receiving the spherical segment-shaped section 16 of the head; and an element 17 which exerts pressure on the head to lock the head in the receiving portion. The head has a hollow inner portion to receive a free end portion 22 of the shank, and the head and the end portion are formed such that the end portion is elastically clamped by the head while the head is not locked. COPYRIGHT: (C)2007,JPO&INPIT
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