| 摘要 |
A bone anchoring device is provided comprising
a bone anchoring element (1) having a head (3) and a shaft (2) configured to be anchored in a bone or a vertebra;
a receiving part (4) for coupling the bone anchoring element to a stabilization element (100),
the receiving part having
a top end (4a) and bottom end (4b), a bore (9) extending from the top end to the bottom end and having a bore axis (C),
a substantially U-shaped recess (10) for receiving the stabilization element, the recess being in communication with said bore (9);
a seat member (5) arranged within the bore (9) and being rotatable around the bore axis, the seat member forming a seat for pivotably holding the head,
wherein the seat member is configured to allow a greater pivot angle of the bone anchoring element to one side compared to the other side relative to the bore axis (C);
a pressure member (6) which contacts the head to exert pressure onto the head, the pressure member (6) being axially movable with respect to the seat member (5) and connected to the seat member (5) so as to transmit rotational forces to the seat member. The orientation of the seat member can be adjusted from the top. |
