Multi-axial spinal cross connecting device
View Patent ↗A cross connecting device suitable for connecting first and second spinal fixation devices comprises a fixable pivot junction, first and second connection members, and first and second clamps. The fixable pivot junction includes a pivotable joint that is pivotable about a pivot point. The fixable pivot junction also includes a collar configured for fixating the pivot junction. The first and second connection members are connected by the fixable pivot junction such that the fixable pivot junction allows the first and second connection members to be repositioned relative to each other. The first and second clamps are connected to respective ones of the first and second connection members at distal ends of the connection members relative to the fixable pivot junction. The first and second clamps allow the cross connecting device to be clamped on to spinal fixation devices, such as pedicle screws or hooks.
1. A cross connecting device suitable for connecting first and second spinal fixation devices, the cross connecting device comprising:
a fixable pivot junction, the pivot junction comprising a slidable collar and a pivotable joint that is pivotable about a pivot point, the collar being configured for fixating the pivot junction;
first and second connection members connected by the fixable pivot junction such that the fixable pivot junction allows the first and second connection members to be repositioned relative to each other; and
first and second clamps connected to respective ones of the first and second connection members at distal ends of the connection members relative to the fixable pivot junction;
wherein the pivotable joint comprises a tapered interface and a split pivot element;
wherein the tapered interface is configured for applying a compressive load to the split pivot element and the second connection member while the slidable collar is in the locking position; and
wherein the clamps each comprise an outer housing and an inner housing rotationally or angularly adjustable relative to each other.
2. The cross connecting device of claim 1 , wherein the collar is slidable between an unlocking position and a locking position.
3. The cross connecting device of claim 2 , wherein the locking position is closer to a pivot point of the pivotable joint than the unlocking position.
4. The cross connecting device of claim 2 , wherein the collar further comprises one or more tabs for preventing the movement of the collar from the locking position to the unlocking position.
5. The cross connecting device of claim 1 , wherein the tapered interface is connected to the first connection member.
6. The cross connecting device of claim 1 , wherein the tapered interface comprises plurality of slits surrounding the split pivot element.
7. The cross connecting device of claim 1 , wherein the first and second clamps are configured to be connected to respective ones of the first and second spinal fixation devices.
8. The cross connecting device of claim 7 , wherein each of the first and second clamps includes a respective locking member that can be adjusted to tighten the respective clamp onto the respective spinal fixation device.
9. The cross connecting device of claim 8 , wherein the clamps each include a socket for receiving a respective one of the set screws, where the socket includes a top hole and a bottom hole, the bottom hole being misaligned with the top hole.
10. The cross connecting device of claim 9 , wherein each of the set screws includes a tapered end, wherein the tapered end of the set screw can pass through the misaligned bottom hole as the set screw is driven into the socket, thereby urging the misaligned bottom hole to align with the top hole as the set screw is driven into the socket.
11. The cross connecting device of claim 9 , wherein the clamp tightens onto the respective spinal fixation device as the misaligned bottom hole is aligned with the top hole by the set screw.
12. The cross connecting device of claim 1 , wherein the outer housing and the inner housing are rotationally and angularly adjustable relative to each other along at least two degrees of freedom.
13. The cross connecting device of claim 1 , wherein the outer housing includes a channel that allows for expansion and compression of the outer housing.
14. The cross connecting device of claim 13 , wherein the channel includes a transverse channel region.
15. The cross connecting device of claim 1 , wherein the inner housing includes a channel that allows for expansion and compression of the inner housing.
16. The cross connecting device of claim 1 , wherein the fixable pivot junction allows the first and second connection members to be translationally, rotationally, and angularly repositioned relative to each other.