Rod persuader

• US 20090105712A1
• Filed: 10/23/2007
• Published: 04/23/2009
• Est. Priority Date: 10/23/2007
• Status: Active Grant

• Current Assignee: Aesculap Implant Systems LLC (Sartorius AG)
• Original Assignee: Aesculap Implant Systems LLC (Sartorius AG)
• Inventors: Dauster, Andrew, Weaver, Paul, Kovach, Matthew
• Granted Patent: US 8,540,718 B2
• Time in Patent Office: Days
• US Class Current: 606/99
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 17/7086 Rod reducers, i.e. devices providing a mechanical advantage to allow a user to force a rod into or onto an anchor head other than by means of a rod-to-bone anchor locking element; rod removers

Abstract

A rod persuader assembly includes a tubular body, an inner shaft and an outer shaft. The inner shaft is axially displaceable relative to the tubular body, and has a gripping end and a handle end. The outer shaft is axially displaceable relative to the tubular body, and has a rod reducing end. In one embodiment, the handle end is rotatable relative to the gripping end. In another embodiment, the gripping end includes a cylindrical socket. In yet another embodiment, the rod persuader assembly is operable in two separate and independent stages to secure the instrument to an implant, and advance a rod into the implant.

Claims

1. A rod persuader assembly comprising:

a tubular body;

an inner shaft axially displaceable relative to the tubular body, the inner shaft having a gripping end and a handle end that is rotatable relative to the gripping end; and

an outer shaft axially displaceable relative to the tubular body, the outer shaft having a rod reducing end.

2. The rod persuader assembly of claim 1, wherein the tubular body, the handle end of the inner shaft and the outer shaft are rotatable relative to the gripping end of the inner shaft.

3. The rod persuader assembly of claim 1, wherein the gripping end is generally cylindrical.

4. The rod persuader assembly of claim 1, wherein the gripping end comprises a generally cylindrical collet having a plurality of branches, the branches being radially displaceable between a relatively open position, in which the branches are displaced radially outwardly from one another, and a closed position, in which the branches are displaced radially inwardly toward one another, the distance between the branches being greater in the open position than in the closed position.

5. The rod persuader assembly of claim 4, wherein the handle end of the inner shaft is rotatable in a first direction to move the gripping end of the inner shaft proximally relative to the tubular body to move the branches to the relatively closed position, the handle end of the inner shaft being rotatable in a second direction to move the gripping end of the inner shaft distally relative to the tubular body to move the branches to the relatively open position.

6. The rod persuader assembly of claim 5, wherein the handle end of the inner shaft is rotatably coupled to the gripping end of the inner shaft to permit the handle end and gripping end to rotate independently of one another.

7. The rod persuader assembly of claim 1 wherein the inner shaft comprises an outer thread and the tubular body comprises an inner thread in cooperative engagement with the outer thread.

8. The rod persuader assembly of claim 1, wherein the tubular body comprises an outer thread and the outer shaft comprises an inner thread in cooperative engagement with the outer thread.

9. The rod persuader assembly of claim 8, wherein the outer shaft comprises an adjustment knob and a generally cylindrical persuader member coupled to the adjustment knob, the adjustment knob comprising said inner thread of the outer shaft.

10. The rod persuader assembly of claim 9, wherein the adjustment knob is rotatably coupled to the persuader member, with the knob being rotatable independent of the persuader member.

11. The rod persuader assembly of claim 9, wherein the tubular body comprises a first alignment surface and the persuader member comprises a second alignment surface that cooperatively engages the first alignment surface on the tubular body to substantially prevent rotation of the persuader member relative to the tubular body.

12. The rod persuader assembly of claim 1, further comprising a torque-applying handle attached to one of the outer sleeve and the tubular body, wherein at least one of the outer sleeve and the tubular body comprises a gripping surface that cooperates with the torque-applying handle.

24. The rod persuader assembly of claim 1, wherein the inner shaft comprises a first alignment surface and the tubular body comprises a second alignment surface that cooperatively engages the first alignment surface on the inner shaft to substantially prevent rotation of the inner shaft relative to the tubular body.

13. A rod persuader assembly comprising:

a tubular body;

an inner shaft axially displaceable relative to the tubular body, the inner shaft having a gripping end and a handle end, the gripping end comprising a cylindrical socket; and

an outer shaft axially displaceable relative to the tubular body, the outer shaft having a rod reducing end.

14. The rod persuader assembly of claim 13, wherein the tubular body, the handle end of the inner shaft and the outer shaft are rotatable relative to the gripping end of the inner shaft.

15. The rod persuader assembly of claim 13, wherein the gripping end comprises a generally cylindrical collet having a plurality of branches, the branches being radially displaceable between a relatively open position, in which the branches are displaced radially outwardly from one another, and a closed position, in which the branches are displaced radially inwardly toward one another, the distance between the branches being greater in the open position than in the closed position.

16. The rod persuader assembly of claim 15, wherein the handle end of the inner shaft is rotatable in a first direction to move the gripping end of the inner shaft proximally relative to the tubular body to move the branches to the relatively closed position, the handle end of the inner shaft being rotatable in a second direction to move the gripping end of the inner shaft distally relative to the tubular body to move the branches to the relatively open position.

17. The rod persuader assembly of claim 13, wherein the handle end of the inner shaft is rotatably coupled to the gripping end of the inner shaft to permit the handle end and gripping end to rotate independently of one another.

18. The rod persuader assembly of claim 13 wherein the inner shaft comprises an outer thread and the tubular body comprises an inner thread in cooperative engagement with the outer thread of the inner shaft.

19. The rod persuader assembly of claim 13, wherein the tubular body comprises an outer thread and the outer shaft comprises an inner thread in cooperative engagement with the outer thread of the tubular body.

20. The rod persuader assembly of claim 19, wherein the outer shaft comprises an adjustment knob and a generally cylindrical persuader member coupled to the adjustment knob, the adjustment knob comprising said inner thread of the outer shaft.

21. The rod persuader assembly of claim 20, wherein the adjustment knob is rotatably coupled to the persuader member, with the knob being rotatable independent of the persuader member.

22. The rod persuader assembly of claim 13, wherein the tubular body comprises a first alignment surface and the persuader member comprises a second alignment surface that cooperatively engages the first alignment surface on the tubular body to substantially prevent rotation of the persuader member relative to the tubular body.

23. The rod persuader assembly of claim 13, further comprising a torque-applying handle attached to one of the outer sleeve and the tubular body, wherein at least one of the outer sleeve and the tubular body comprises a gripping surface that cooperates with the torque-applying handle.

25. The rod persuader assembly of claim 13, wherein the inner shaft comprises a first alignment surface and the tubular body comprises a second alignment surface that cooperatively engages the first alignment surface on the inner shaft to substantially prevent rotation of the inner shaft relative to the tubular body.