Patent ID: 9017390
Filing Date: 2015-04-28
Classification: A61B,Y10T

Abstract:
1. A poly-axial bone anchoring device comprising: a bone anchoring element having a shank for anchoring to a bone and a head; a head receiving part having a first end, an open second end, and a hollow interior portion in communication with the open second end for receiving the head therein, the head receiving part being flexible for clamping the head; a locking ring configured to be mounted around the head receiving part, the locking ring comprising a rod receiving portion; a cap configured to be connected to the head receiving part, the cap having a first end, a second end, a central axis extending through the first and second ends of the cap, and two opposite legs extending in a direction of the central axis; and a locking element configured to extend from the cap to engage an inserted rod and to lock relative positions of the bone anchoring element and inserted rod relative to the head receiving part; wherein when the head is in the head receiving part and the locking ring is around the head receiving part, the head is pivotable in the head receiving part and can be locked at an angle relative to the head receiving part by compressing the head receiving part with the locking ring; and wherein the cap is rotatable relative to the head receiving part between a first position in which the cap is movable axially in a first direction away from the second end of the head receiving part and a second position in which the legs engage the head receiving part to prevent movement of the cap in the first direction and to hold an inserted rod between the cap and the head receiving part.