Patent ID: 9532809
Date: 2017-01-03
CPC Classifications: A61B

Claim:
1. A polyaxial bone anchoring device comprising: a bone anchoring element having a shank for anchoring to a bone and a head; a head receiving part having an open first end, an open second end with a bounding edge, and a hollow interior portion in communication with the open first end and the open second end for receiving the head therein, the head receiving part being flexible for clamping the head; and a locking ring having a first end, a second end, and a rod receiving portion defining a recess for receiving a rod at the first end, wherein the recess has a greatest horizontal width at a first region spaced apart from the first end of the locking ring, and wherein a horizontal width of the recess narrows from the first region in a direction towards the first end of the locking ring; wherein the locking ring is configured to engage and be positioned around the head receiving part, and wherein when the locking ring is around the head receiving part, the engagement prevents separation of the locking ring from the head receiving part; and wherein when the head is in the head receiving part with the shank extending through the open second end of the head receiving part and the locking ring is around the head receiving part, the locking ring is movable from a first position wherein the head is pivotable in the head receiving part and the locking ring is rotatable relative to the head receiving part, to a second position wherein the first end of the locking ring is positioned closer to the second end of the head receiving part and wherein the locking ring applies a compressive force to the head receiving part to lock an angular position of the bone anchoring element and a rotational position of the locking ring relative to the head receiving part.