Methods and apparatus for stabilizing a spinal segment
One or more sutures can be used in spinal applications to hold an intradiscal device in place between two vertebrae or repair a defect in the soft tissue of the spine, such as the annulus fibrosis or the dura. Tension can also be applied to the sutures to stabilize a spinal segment having an intradiscal device to prevent or minimize excessive spinal extension, lateral bending, and axial rotation of the spinal segment. Anchors are placed in two adjacent vertebrae and sutures are passed through each anchor. The sutures can be passed through portions of the intradiscal device. Alternatively, the sutures can be passed through a mesh patch which is held against the vertebrae to hold the intradiscal device in place. Tension is applied to the first and second ends of the sutures and the sutures are welded together. The sutures can be welded in a cross-braced arrangement minimize or prevent extension, lateral bending, and rotation of the spinal segment. For example, the sutures can be welded in a diagonal pattern, a horizontal pattern, a vertical pattern or any combination thereof across the adjacent vertebrae.
1. A method for stabilizing a spinal segment, comprising the steps of:
providing first, second, third, and fourth anchors, wherein each anchor carries a first elongate cable having first and second ends that extend from each anchor and a second elongate cable having first and second ends that extend from each anchor;
attaching the first anchor to a first vertebra, attaching the second anchor to the first vertebra, attaching the third anchor to a second vertebra, and attaching the fourth anchor to the second vertebra; and
attaching each of the first and second ends of the first and second elongate cables of the first anchor to create an attachment with one of the first and second ends of one of the first or second elongate cables of the second, third, and fourth anchors, attaching each of the first and second ends of the first and second elongate cables of the second anchor to create an attachment with one of the first and second ends of one of the first or second elongate cables of the first, third, and fourth anchors, attaching each of the first and second ends of the first and second elongate cables of the third anchor to create an attachment with one of the first and second ends of one of the first or second elongate cables of the first, second, and fourth anchors, attaching each of the first and second ends of the first and second elongate cables of the fourth anchor to create an attachment with one of the first and second ends of one of the first or second elongate cables of the first, second, and third anchors,
wherein each step of attaching is accomplished by welding.
2. The method of claim 1 , wherein the elongate cables are attached in the pattern of a quadrilateral having diagonal connections between vertices.
3. The method of claim 1 , wherein the elongate cables are attached in the pattern of a figure-eight having left and right generally vertically extending segments and diagonal connections between upper and lower end regions of each vertically extending segment.
4. The method of claim 1 , wherein the method is used to prevent excessive movement across a spinal segment.
5. The method of claim 1 , wherein the method is used for annulus and spinal ligament reconstruction.
6. The method of claim 5 further comprising the step of removing at least a portion of the annulus fibrosis between a first vertebra and a second vertebra.
7. The method of claim 6 , further comprising the step of inserting a total disc replacement device between a first vertebra and a second vertebra.
8. The method of claim 1 , further comprising the step of removing at least a portion of the nucleus within the annulus fibrosis between a first vertebra and a second vertebra.
9. The method of claim 1 , further comprising the step of replacing at least a portion of the nucleus within the annulus fibrosis between a first vertebra and a second vertebra.
10. The method of claim 1 , wherein the method is used across a natural disc adjacent to a fusion construct so as to protect the adjacent natural disc.
11. The method of claim 1 , wherein the method is used to treat any one or more of a natural undamaged disc, natural injured disc, a disc having a nucleus replacements, a damaged or deformed vertebrae, damaged or deformed facets joints, and other spinal injuries such as fractures, subluxations, or dislocations.
12. The method of claim 1 , further comprising the step of placing a mesh patch between the elongate cables and the annulus fibrosis.
13. The method of claim 1 , further comprising the step of placing an anti-adhesive patch covering over the elongate cables.