Patent ID: 9241737
Filing Date: 2016-01-26
CPC Classification: A61B

Claim Text:
1. A polyaxial bone anchoring device comprising: a bone anchoring element comprising a head and a shank; a receiving part for coupling a rod to the bone anchoring element, the receiving part having a first end, an opposite second end, a central axis extending through the first end and the second end, a channel at the first end for receiving the rod, and an accommodation space at the second end for receiving the head; and a pressure element configured to be positioned in the receiving part and to exert pressure on the head, the pressure element comprising at least one flexible section having a free end; wherein the receiving part or the free end of the flexible section of the pressure element has an inclined surface portion, such that when the pressure element is in the receiving part, the inclined surface portion widens away from the central axis as the inclined surface portion extends in a direction from the first end of the receiving part towards the second end of the receiving part; and wherein when the head and the pressure element are in the receiving part, the receiving part and the free end of the flexible section of the pressure element are configured to engage one another to form a first engagement at the inclined surface portion, such that a force is exerted by the receiving part on the pressure element at the first engagement, the force being directed towards the second end of the receiving part for the pressure element to exert a pre-load on the head.