Patent ID: 9492204
Filing Date: 2016-11-15
CPC Classification: A61B

Claim Text:
1. A polyaxial bone anchoring device comprising: a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a first end, a second end, a central axis extending through the first end and the second end, a channel intersecting the central axis for receiving a rod, an accommodation space for accommodating the head, the accommodation space having an opening at the second end, and a passage extending along the central axis from the first end to the accommodation space; a cap member having a first portion configured to be positioned in the accommodation space and to hold the head, wherein the first portion is expandable in the accommodation space to allow insertion of the head and compressible to exert pressure on the head; and a non-expandable sleeve-like insert piece comprising a spherical segment-shaped and continuous outer surface portion that forms an endless ring, wherein the insert piece is configured to be positioned at least partially around the first portion of the cap member; wherein when the cap member and the insert piece are in the receiving part and the insert piece is positioned at least partially around the first portion of the cap member, the insert piece is pivotable relative to the cap member, such that an angle formed between a central axis of the insert piece and a central axis of the cap member is adjustable.