Polyaxial spine screw rod holder having a second, offset rod holder
A spine fixation assembly has a polyaxial spine screw rod holder for a first spine rod and a second rod holder for a second spine rod, the second rod holder is linked to the polyaxial spine screw rod holder via a connector, the connector extending radially outward from the polyaxial spine screw rod holder such that the second rod holder is spatially separated from and offset relative to the polyaxial spine screw rod holder. The polyaxial spine screw rod holder defines a first rod seat that holds the first spine rod. The first spine rod has a first longitudinal axis. The second rod holder defines a second rod seat that holds a second spine rod. The second rod has a second longitudinal axis. The second rod holder is oriented relative to the polyaxial spine screw rod holder by the connector at an offset (angle).
1. A spine fixation implant comprising:
a bone screw having a bone screw head and a bone screw longitudinal axis;
a polyaxial spine screw rod holder disposed on the bone screw head and configured to retain a first spine rod having a first longitudinal axis at a first axial orientation transverse to the bone screw longitudinal axis;
a first set screw receivable in the polyaxial spine screw rod holder that locks axial position of the polyaxial spine screw rod holder on the bone screw head and locks the first spine rod to the polyaxial spine screw rod holder;
a connector formed integral to the polyaxial spine rod holder and extending from a lower side of the polyaxial spine rod holder transverse to the first axial orientation of the first spine rod, the connector having a connector longitudinal axis;
a screw-less spine rod holder situated on the connector for rotation about the connector longitudinal axis and configured to retain a second spine rod having a second longitudinal axis at a second axial orientation; and
a second set screw receivable in the screw-less spine rod holder that locks rotational position of the screw-less spine rod holder on the connector and locks the second spine rod to the screw-less spine rod holder.
2. The spine fixation implant of claim 1 , wherein rotational position of the screw-less spine rod holder is variably adjustable relative to the connector.
3. The spine fixation implant of claim 2 , wherein the screw-less spine rod holder is spatially variably adjustable on the connector relative to the polyaxial spine screw rod holder.
4. The spine fixation implant of claim 3 , wherein the polyaxial spine screw rod holder has a first rod seat configured to receive the first spine rod, and the screw-less spine rod holder has a second rod seat configured to receive the second spine rod.
5. The spine fixation implant of claim 4 , wherein orientation of the second rod seat of the screw-less spine rod holder is rotatable relative to the orientation of the first rod seat of the polyaxial spine screw rod holder such that the second longitudinal axis of the second spine rod retained in the second rod seat of the screw-less spine rod holder is rotationally positionable relative to the first longitudinal axis of the first spine rod retained in the first rod seat of the polyaxial spine screw rod holder, and spatial orientation of the second rod seat of the screw-less spine rod holder is independently positionable relative to the first rod seat of the polyaxial spine screw rod holder such that distance between the second spine rod retained in the second rod seat of the screw-less spine rod holder relative to the first spine rod retained in the first rod seat of the polyaxial spine screw rod holder is adjustable.
6. The spine fixation implant of claim 4 , wherein the first rod seat of the polyaxial spine screw rod holder is defined by first and second rod pockets, and the second rod seat of the screw-less spine rod holder is defined by third and fourth rod pockets.
7. The spine fixation implant of claim 3 , wherein the offset is a perpendicular to the first longitudinal axis of the first spine rod retained in the polyaxial spine screw rod holder.
8. The spine fixation implant of claim 7 , wherein the offset is ninety degrees) (90° from the perpendicular to the first longitudinal axis of the first spine rod retained in the polyaxial spine screw rod holder.
9. A method of spine fixation comprising:
providing a spine implant having a bone screw with a bone screw head and a bone screw longitudinal axis, a polyaxial spine screw rod holder disposed on the bone screw head and configured to retain a first spine rod having a first longitudinal axis at a first axial orientation transverse to the bone screw longitudinal axis, a first set screw receivable in the polyaxial spine screw rod holder that locks axial position of the polyaxial spine screw rod holder on the bone screw head and locks the first spine rod to the polyaxial spine screw rod holder, a connector formed integral to the polyaxial spine rod holder and extending from a lower side of the polyaxial spine rod holder transverse to the first axial orientation of the first spine rod, the connector having a connector longitudinal axis, a screw-less spine rod holder situated on the connector for rotation about the connector longitudinal axis and configured to retain a second spine rod having a second longitudinal axis at a second axial orientation; and a second set screw receivable in the screw-less spine rod holder that locks rotational position of the screw-less spine rod holder on the connector and locks the second spine rod to the screw-less spine rod holder; and
installing the spine implant on vertebrae of a spine.
10. The method of claim 9 , wherein the offset is between a perpendicular to the first longitudinal axis of the first spine rod retained in the polyaxial spine screw rod holder and a parallel to the first longitudinal axis of the first spine rod retained in the polyaxial spine screw rod holder.