Articulating spinal fixation rod and system
The present invention relates generally to systems and methods for aligning and implanting orthopedic fixation or stabilization implants within the body. In one embodiment, the system includes at least two bone anchors, at least one of which is provided with a transverse portal and a locking member. In one aspect, the system also includes at least one linkage rod, for linking two or more bone anchors through their respective locking members. The linking rod may include at least one angularly adjustable joint, which may be fixed by actuating the locking member. The bone anchors and the linkage rod may be locked into place to form a spinal fusion or fixation prosthesis.
1. A method of implanting spinal fusion hardware, comprising the steps of:
positioning a first bone anchor, having a first aperture, in a first vertebral body;
positioning a second bone anchor, having a second aperture, in a second vertebral body;
mounting an alignment tool to at least one bone anchor, the alignment tool comprising a curved guide needle;
advancing a guide wire through the first and second apertures using the alignment tool; and
thereafter, advancing a linkage rod through the first and second apertures while simultaneously advancing the linkage rod over and along the guide wire, so as to slide the linkage rod over the guide wire and through the first and second apertures:
wherein at least a portion of the alignment tool is mounted to the bone anchor before the positioning a bone anchor step.
2. A method of implanting spinal hardware as in claim 1 , wherein the first and second vertebral bodies are adjacent vertebral bodies.
3. A method of implanting spinal hardware as in claim 1 , wherein the first and second vertebral bodies are separated by a third vertebral body.
4. A method of implanting spinal hardware as in claim 1 , wherein the mounting an alignment tool comprises mounting a central arm on the bone anchor, the central arm pivotably attached to a radial arm, and the guide needle is carried by the radial arm.
5. A method of implanting spinal hardware as in claim 1 , wherein the guide needle has a radius of curvature within the range of from about 6 cm to about 15 cm.
6. A method of implanting spinal hardware as in claim 1 , additionally comprising the step of manipulating a component of a bone anchor to lock the fixation rod.
7. A method of implanting spinal hardware as in claim 1 , wherein the linkage rod comprises a segmented rod.
8. A method of implanting spinal hardware as in claim 1 , wherein the linkage rod comprises a rod without joints.
9. A method of implanting spinal fusion hardware, comprising the steps of:
positioning a first bone anchor, having a first aperture, in a first vertebral body;
positioning a second bone anchor, having a second aperture, in a second vertebral body;
mounting an alignment tool to at least one bone anchor, the alignment tool comprising a curved guide needle;
advancing a guide wire through the first and second apertures using the alignment tool; and
thereafter, advancing a linkage rod through the first and second apertures while simultaneously advancing the linkage rod over and along the guide wire, so as to slide the linkage rod over the guide wire and through the first and second apertures;
wherein the mounting an alignment tool comprises mounting a central arm on the bone anchor, the central arm pivotably attached to a radial arm, and the guide needle is carried by the radial arm.
10. A method of implanting spinal hardware as in claim 9 , wherein the first and second vertebral bodies are adjacent vertebral bodies.
11. A method of implanting spinal hardware as in claim 9 , wherein the first and second vertebral bodies are separated by a third vertebral body.
12. A method of implanting spinal hardware as in claim 9 , wherein the guide needle has a radius of curvature within the range of from about 6 cm to about 15 cm.