Patent ID: 9333016
Filing Date: 2016-05-10
CPC Classification: A61B

Claim Text:
1. A polyaxial bone anchoring device comprising a receiving part for receiving a head of a bone anchoring element and for receiving a rod, the receiving part comprising: a first member with a top end and a bottom end, a central axis extending through the top end and the bottom end, a head receiving portion having an inner wall defining a passage at the bottom end for accommodating the head of the bone anchoring element, and a channel at the top end for receiving the rod; a second member having a top end and a bottom end and a bore extending from the top end to the bottom end, the second member being connectable to the first member at or near the bottom end of the first member; and at least one clamping member that is separable from the first member and configured to be positioned at or near the bottom end of the first member and to protrude into the passage; wherein the second member is movable relative to the first member from a first position wherein the clamping member is movable radially between the position protruding into the passage and a position farther away from the central axis, to a second position wherein the clamping member is prevented from moving to the position farther away from the central axis to hold the head of the bone anchoring element in the head receiving portion, and wherein when the second member is at the second position, an engagement between the first member and the second member holds the second member against movement towards the first position.