| 摘要 |
A polyaxial bone anchoring device includes a bone anchoring element having a shank and a head, a receiving part including a rod receiving portion, and a head receiving portion having a first end and an open second end with a bounding edge, wherein the head receiving portion is configured to be rotatably connected to the rod receiving portion and is flexible for introduction and clamping of the head, and a locking ring configured to be mounted around the head receiving portion, wherein the head is insertable into the head receiving portion from the second end, is pivotable in the head receiving portion at a larger maximum pivot angle relative to the receiving part at a first location of the bounding edge, and can be locked at an angle relative to the receiving part by compressing the head receiving portion with the locking ring. |
