Instruments and methods for delivering bone cement to a bone screw

1. A system, comprising:

a cannulated bone screw having a head that is configured to be received within a rod receiver, and a shank extending distally from the head and configured to extend distally from the rod receiver, the head having proximal and distal recesses therein; and

an instrument for delivering bone cement to the cannulated bone screw, the instrument comprising

a cannulated shaft having a distal end configured to extend into the shank of the cannulated bone screw, and a proximal end configured to couple to a bone cement delivery system, and

a retaining sleeve disposed around at least a portion of the cannulated shaft, the retaining sleeve having a distal end that is configured to couple to the proximal recess in the head of the bone screw.

2. The system of claim 1 , wherein the instrument further comprises a coupling assembly that is configured to selectively couple the cannulated shaft to the retaining sleeve to prevent axial translation of the cannulated shaft relative to the retaining sleeve.

3. The system of claim 2 , wherein the coupling assembly includes a release mechanism that is configured to selectively disengage the cannulated shaft from the retaining sleeve.

4. The system of claim 3 , wherein the coupling assembly includes a biasing element that biases the release mechanism toward a groove of the cannulated shaft.

5. The system of claim 3 , wherein the release mechanism has a channel extending therethrough, and wherein the channel at least partially overlaps with a lumen that extends through an annular body such that the coupling assembly is disposed around a portion of the cannulated shaft.

6. The system of claim 2 , wherein the coupling assembly is coupled to the proximal end of the retaining sleeve.

7. The system of claim 6 , wherein a distal end of the coupling assembly is threadably coupled to the proximal end of the retaining sleeve.

8. The system of claim 1 , wherein the proximal recess of the cannulated bone screw is threaded, and wherein the distal end of the retaining sleeve is threadably coupled to the proximal recess.

9. The system of claim 1 , wherein the instrument further comprises a coupling assembly that is configured to selectively engage a groove of the cannulated shaft, and wherein the groove is associated with a predetermined insertion depth of the distal end of the cannulated shaft into the cannulated bone screw.

10. The system of claim 1 , wherein the instrument further comprises a coupling assembly that is configured to selectively couple the retaining sleeve to a drive shaft of a screw driver assembly to implant the cannulated bone screw into bone.

11. A system, comprising:

a cannulated bone screw having a head that is configured to couple to a rod receiver and a shank extending distally from the head, the head having proximal and distal recesses therein; and

an instrument for delivering bone cement to the cannulated bone screw, the instrument comprising

a cannulated shaft having a distal end that is configured to extend into the shank of the bone screw, and a proximal end that is configured to couple to a bone cement delivery system such that bone cement can be delivered through the cannulated shaft and into the shank of the bone screw, and

a guiding assembly that is partially disposed around the cannulated shaft and including a guiding sleeve having a distal end that is configured to couple to the proximal recess in the head of the bone screw, and a locking mechanism that is configured to couple to a proximal end of the guiding sleeve, the locking mechanism being configured to selectively lock the cannulated shaft and the guiding sleeve together to inhibit longitudinal movement of the cannulated shaft relative to the guiding sleeve.

12. The system of claim 11 , wherein a distal end of the locking mechanism is configured to threadably couple to the proximal end of the guiding sleeve.

13. The system of claim 11 , wherein the locking mechanism includes a release mechanism that is configured to selectively engage a groove of the cannulated shaft.

14. The system of claim 13 , wherein the locking mechanism includes a biasing element that biases the release mechanism toward the groove of the cannulated shaft.

15. The system of claim 13 , wherein the locking mechanism further comprises an annular body having a first portion, a second portion, and a lumen extending therebetween, and wherein the release mechanism is partially housed within the first portion of the annular body.

16. The system of claim 15 , wherein the release mechanism has a channel extending therethrough, and wherein the channel at least partially overlaps with the lumen of the annular body.

17. The system of claim 11 , wherein the locking mechanism comprises a releasing mechanism that is configured to selectively engage a groove of the cannulated shaft, and wherein the groove is associated with a predetermined insertion depth of a distal end of the cannulated shaft into the cannulated bone screw.

18. The system of claim 11 , wherein the locking mechanism includes a release button that is configured to selectively disengage the cannulated shaft from the guiding sleeve.

19. The system of claim 11 , wherein the locking mechanism is further configured to selectively lock the guide sleeve to a drive shaft of a screw driver assembly to implant the cannulated bone screw into bone.

20. The system of claim 11 , wherein the proximal recess of the cannulated bone screw is threaded, and wherein the distal end of the guiding sleeve is configured to threadably couple to the proximal recess.