| 主权项 |
1. A bone anchoring device comprising:
an anchoring element comprising a shaft for anchoring in the bone, and a head; a receiving part for receiving the head and for receiving a rod to be connected to the anchoring element, the receiving part being formed in one piece and having a top end and a bottom end, a bore extending from the top end to the bottom end, an inner wall defined by the bore, a substantially U-shaped channel adjacent to the top end for receiving the rod, and a seat adjacent to the bottom end for accommodating the head, wherein the anchoring element is to be inserted from the top end; a pressure element that is able to exert pressure onto the head,
wherein the anchoring element is pivotable with respect to the receiving part and can be fixed at an angle by exerting pressure via the pressure element onto the head; and a spring element having a spring force,
wherein a bottom portion of the spring element facing the bottom end projects farther into the bore than a top portion of the spring element facing the top end, andwherein the spring element acts between the pressure element and the receiving part and allows the pressure element to be introduced from the top end but withstands against removal of the pressure element through the top end. |
