| 摘要 |
<p>A bone anchoring device is provided which comprises:
an anchoring element (13) comprising a shank (14) to be anchored in a bone or a vertebra and a head (16; 160);
a receiving portion (1; 100) comprising a first end (2) and a second end (3) opposite to the first end (2), a longitudinal axis (4) passing through the two ends, a bore (5) coaxial with the longitudinal axis (4), and a first region (7; 70) adjacent to the second end (3) for receiving a section (22; 221) of said head;
an element (28; 30) which exerts pressure on said head (17; 170) to lock said head (16; 160) in the receiving portion;
wherein the receiving portion (1) and the anchoring element (13) are connected such that the longitudinal axis (4) of the receiving portion (1) and the shank axis (14a) have a fixed angle relative to each other and wherein the receiving portion (1) and the shank (14) are rotatable with respect to each other around the longitudinal axis (4) when a pressure is not exerted on the head and are locked in the rotational position when pressure is exerted on the head.</p> |
