Bone anchoring device

摘要

A bone anchoring device includes an anchoring element having a shaft and a head; a receiving part for receiving the head and a rod, 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; a pressure element; and a spring element having a spring force. The anchoring element is inserted from the top end and is pivotable with respect to the receiving part. The pressure element is movable in the bore so as to be able to fix the anchoring element at an angle with respect to the receiving part by exerting pressure onto the head. 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.

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 defining the bore and forming a spring element having a spring force, 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; and 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, wherein the spring element comprises a protrusion at a distal end that, in a relaxed state, extends into the bore, and wherein, a top surface of the protrusion facing the top end and a bottom surface of the pressure element are shaped such that, when the pressure element is inserted through the top end and contacts the protrusion, the spring element moves away from the bore to allow the pressure element to pass farther into the receiving part.