UNI-PLANER BONE FIXATION ASSEMBLY

摘要

A bone fixation assembly includes a plurality of bone fixation elements that each include a bone anchor configured to be implanted into underlying bone, such as a vertebra. Each bone anchor is received in an anchor seat, and the anchor seats are joined by a fixation rod so as to operatively couple and fix the position and orientation of the vertebrae relative to each other. The bone anchor is free to rotate relative to the anchor seat, and is also free to pivot in a desired direction relative to the anchor seat.

主权项

1. A bone fixation subassembly configured to receive a fixation rod and a locking cap, the bone fixation subassembly comprising:
an anchor seat including an anchor seat body extending along a central axis and defining an upper end and a lower end, wherein the upper end comprises a pair of opposing fixation rod-receiving gaps therebetween that are spaced along a longitudinal axis, and a bore disposed between the rod-receiving gaps; and a collet including a collet body disposed in the anchor seat, the collet body configured to attach to a bone anchor that extends along an axis of rotation, wherein a bone anchor attached to the collet is permitted to rotate about the axis of rotation relative to the anchor seat, and the bone anchor is further permitted to pivot relative to the anchor seat along a desired plane and prevented from pivoting in another plane that includes the central axis and is angularly offset with respect to the desired plane.