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1. (WO2016126764) SYSTEM AND METHOD FOR SPINAL FUSION
Nota: Texto obtenido mediante procedimiento automático de reconocimiento óptico de caracteres.
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WHAT IS CLAIMED IS:

1. A spinal fusion apparatus comprising:

a first screw assembly, wherein the first screw assembly comprises a shaft part and a tulip having a slot; and

a second screw assembly, wherein the second screw assembly comprises a shaft part, a tulip having a slot, and a rod having a ball,

wherein the ball is detachable from the shaft part of the second screw assembly, the ball is configured to form a pivot joint with the tulip of the second screw assembly, and the slot of the first screw assembly and the slot of the second screw assembly are configured to mate with the rod to thereby connect the first screw assembly and the second screw assembly by the rod.

2. The spinal fusion apparatus of claim 1, wherein

the rod is attachable to the shaft part of the second screw, and the rod is configured to drive the shaft part of the second screw.

3. The spinal fusion apparatus of claim 2, wherein

the rod comprises the ball at one end and a tip at another end, wherein the tip is configured to mate with a screw driver.

4. The spinal fusion apparatus of claim 3, wherein

the tip of rod is configured to mate with the screw driver in a snap type latching connection.

5. The spinal fusion apparatus of claim 1, wherein

the second screw assembly comprises a locking cap having a semi-spherical concave bottom side.

6. The spinal fusion apparatus of claim 1, wherein

the ball is configured to form a ball-and-socket joint with the tulip of the second screw assembly.

7. The spinal fusion apparatus of claim 4, wherein

the tulip of the second screw assembly comprises a threaded part configured to mate with a threaded part of the locking cap.

8. The spinal fusion apparatus of claim 5, wherein

the tulip of the first screw assembly comprises a threaded part configured to mate with a threaded part of the locking cap.

9. The spinal fusion apparatus of claim 1, wherein

the tulip of the first screw assembly comprises a rounded lower surface configured to engage a rounded upper surface of a head of the shaft part of the first screw assembly.

10. The spinal fusion apparatus of claim 1, wherein

the tulip of the second screw assembly comprises a rounded lower surface configured to engage a rounded upper surface of a head of the shaft part of the second screw assembly.

11. The spinal fusion apparatus of claim 1, further comprising a third screw assembly, wherein the third screw assembly comprises a shaft part and a tulip having a slot.

12. A hollow cannula comprising:

a blade mounted on the cannula, wherein the blade is slidable in a longitudinal direction of the blade;

a stabilizing pin;

a channel extending parallel to the longitudinal direction of the blade configured to house the stabilizing pin, wherein the stabilizing pin is slidable in the channel,

wherein the blade has a substantially planar portion and an extending direction of the channel is offset from a plane of the planar portion.

13. The cannula of claim 12, wherein

the blade comprises a tab at one end and a tip at the other end, wherein the tip is configured to deploy when the tab is actuated.

14. The cannula of claim 12, further comprising:

a slot at one end of the cannula and a counter torque feature at another end of the cannula.

15. A method for spinal fusion, the method comprising:

positioning a cannula over a first lateral mass;

drilling a hole in the first lateral mass by a drill inserted through the cannula;

inserting a first screw into the first lateral mass through the cannula; positioning the cannula over a second lateral mass;

drilling a hole in the second lateral mass;

inserting a second screw into the second lateral mass though the cannula;

lowering a rod of one of the first screw and the second screw into a tulip of the other of the first screw and the second screw, thereby connecting the first screw and the second screw.

16. The method of claim 15, further comprising:

deploying a blade of the cannula into a facet joint.

17. The method of claim 16, further comprising:

deploying a stabilizing pin of the cannula into one of the first lateral mass and the second lateral mass.

18. The method of claim 15, further comprising:

inserting an endoscope through the cannula.

19. The method of claim 15, further comprising:

applying torque to one of the first screw and the second screw by engaging the rod by a slot of the cannula.

20. The method of claim 15, further comprising:

installing a first locking cap on the first screw and a second locking cap on the second screw.