Anchoring member suitable for use in a polyaxial bone anchoring device and polyaxial bone anchoring device with an enlarged pivot angle to one side

摘要

An anchoring member is provided suitable for use in a polyaxial bone anchoring device, the anchoring member (1) comprising
a bone anchoring section (2) with a bone engagement structure in at least a portion of an outer surface thereof;
a head (3);
a central axis (C) extending through a center of the head (3) and the bone anchoring section (2), and
a neck portion (24; 24'; 24"; 24"') between the bone anchoring section and the head, wherein the neck portion is asymmetric with respect to the central axis (C); and
wherein the bone anchoring section (2) has a contour in a circumferential direction adjacent to the neck portion and wherein the neck portion is at least partially recessed with respect to the contour of the bone anchoring section at one side and extends beyond the contour of the bone anchoring section at an opposite side from the central axis.