Patent ID: 9066759
Filing Date: 2015-06-30
Classification: A61B

Abstract:
1. A receiving part for receiving a rod for coupling the rod to a bone anchoring element, the receiving part comprising: a receiving part body with a first end, a second end, and a central axis extending from the first end to the second end, a rod receiving portion at the first end and having a channel for receiving a rod, and a head receiving portion at the second end for accommodating a head of a bone anchoring element, the head receiving portion having an open end for introducing the head; and a locking ring configured to be positioned around the head receiving portion, wherein the head receiving portion comprises a plurality of flexible wall portions, the flexible wall portions and the locking ring being configured to engage each other at circumferentially distinct pressure areas having positions corresponding to circumferentially separated projections on at least one of the flexible wall portions or the locking ring, and wherein in a plane perpendicular to the central axis and including the pressure areas, a surface of the at least one of the flexible wall portions or the locking ring on which the projections are located is substantially circular with a center of curvature located on the central axis, and wherein at least one of the projections is formed by a curved portion having a center of curvature spaced apart from the central axis.