Uni-planer bone fixation assembly
AssigneeDePuy Synthes Products, Inc.
InventorsDustin M. Harvey, Brian Dec, Tom Keyer
Life of this patent
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Abstract
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.
Claims20
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.
A bone fixation assembly comprising:
- a plurality of bone fixation subassemblies, each subassembly including:
- an anchor seat including an anchor seat body defining a base and a pair of opposing arms extending out from the base, wherein the arms define rod-receiving gaps therebetween disposed along a longitudinal axis;
- a collet including a collet body disposed in the anchor seat;
- a bone anchor extending along an axis of rotation, wherein the bone anchor is configured to be attached to the collet body such that the bone anchor can rotate about the axis of rotation relative to the anchor seat;
- and
- a guide that permits the bone anchor to pivot along a desired plane relative to the anchor seat while preventing the bone anchor from pivoting in another plane angularly offset with respect to the desired plane relative to the anchor seat;
- a fixation rod configured to extend through the rod-receiving gaps of the anchor seat;
- and
- a locking cap configured to attach to the arms, wherein the locking cap is movable to a locked position whereby the collet body is biased against the bone anchor so as to lock the bone anchor with respect to at least one of rotation about the axis of rotation and pivotal movement in the desired plane.
A bone fixation kit comprising;
- a bone anchor extending along an axis of rotation;
- an anchor seat including an anchor seat body 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 the bone anchor, such that the bone anchor can rotate about the axis of rotation relative to the anchor seat, and the bone anchor can pivot in the sagittal plane about an axis that is perpendicular to the longitudinal axis.
Dependencies are inferred from the claim text.