Patent ID: 11937851
Assignee: BIEDERMANN TECHNOLOGIES GMBH & CO. KG
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 20:
21. A polyaxial bone anchoring device comprising:
a bone anchoring element comprising a shank for anchoring to a bone and a head;
a receiving part having a first end, a second end, a longitudinal axis extending through the first end and the second end, a channel at the first end, and an accommodation space at the second end for pivotably holding the head; and
a pressure member positionable in the receiving part, the pressure member comprising a pressure exerting surface and a deformable portion having a free end;
wherein when the pressure member and the head are in the receiving part, the pressure exerting surface is movable from an insertion position where the head is insertable into the accommodation space to a pre-locking position where the head is restricted from being inserted into and removed from the accommodation space, and from the pre-locking position to a locking position where the pressure exerting surface exerts pressure on the head to lock the head relative to the receiving part, and wherein the free end of the deformable portion remains at a same axial position relative to the receiving part when the pressure exerting surface is at the insertion position, the pre-locking position, and the locking position; and
wherein the deformable portion is deformable to move the pressure exerting surface at least from the pre-locking position to the locking position.