Apparatus for securing a spinal rod system

• US 7,278,995 B2
• Filed: 05/20/2003
• Issued: 10/09/2007
• Est. Priority Date: 06/04/2002
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Inventors: Nichols, David, Finley, Eric
• Primary Examiner(s): Robert; Eduardo C.
• Assistant Examiner(s): COMSTOCK, DAVID C
• Application Number:
  US10/441,764
• Publication Number:
  US 20030225408A1
• Time in Patent Office: 1,603 Days
• Field of Search: 606/61, 606/73, 606/86, 606/99, 606/104
• US Class Current: 606/272
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7083 Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
• 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
• CPC Class Codes: A61B 17/7091 for applying, tightening or removing longitudinal element-to-bone anchor locking elements, e.g. caps, set screws, nuts or wedges

Abstract

An apparatus for securing a spinal rod within an anchoring device, wherein the anchoring device has an open end and a locking cap for securing the spinal rod within the open end. The apparatus includes a handle, an elongated body connected to the handle, a pair of jaws attached to the elongated body, a rod persuader for advancing the rod toward the anchoring device, and a locking shaft for use in locking the locking cap against the anchoring device to secure the spinal rod relative to the anchoring device.

Claims

1. An apparatus for facilitating securing of a spinal rod within an anchoring device having an open end and a locking cap for securing the spinal rod within the open end, which comprises:

a handle;

an elongated body connected to the handle and defining a longitudinal axis;

a pair of jaws mountable to the elongated body, the jaws adapted for relative movement between an open displaced position and a closed position, the jaws defining structure for engaging the anchoring device when in the closed position thereof;

a locking shaft disposed within the elongated body and operatively engageable with the locking cap of the anchoring device, the locking shaft being moveable relative to the elongated body to move the locking cap to a secured position thereof within the anchoring device to secure the spinal rod relative to the anchoring device; and

a rod persuader disposed within the locking shaft and adapted for longitudinal movement therein, the rod persuader being advanceable within the elongated body and the locking shaft to operatively engage the spinal rod for urging the spinal rod into the open end of the anchoring device.

2. The apparatus according to claim 1 wherein the rod persuader includes mounting structure for releasably mounting the locking cap, wherein the locking cap engages the spinal rod upon advancing movement of the rod persuader.

3. The apparatus according to claim 2 wherein the locking shaft has internal threads and the rod persuader has external threads that engage the internal threads of the locking shaft.

4. The apparatus according to claim 3 wherein the locking shaft is adapted for rotational movement to move the locking cap of the anchoring device to the secured position thereof.

5. The apparatus according to claim 1 wherein the jaws each include detents for releasably engaging corresponding structure of the anchoring device.

6. The apparatus according to claim 1 wherein the jaws are spring-biased to the open position thereof.

7. The apparatus according to claim 6 wherein one of the jaws is a stationary jaw in fixed relation to the elongated body and the other of the jaws is a moveable jaw.

8. The apparatus according to claim 7, including a manually engageable lever connected to the moveable jaw, the lever moveable to cause corresponding movement of the moveable jaw between the open and closed positions of the jaw assembly.

9. The apparatus according to claim 8, including a lockout mechanism including a lockout arm engageable with the manually engageable lever to selectively secure the moveable jaw in the closed position.

10. The apparatus according to claim 1 wherein the locking shaft is adapted for rotational movement to move the locking cap to the secured position thereof.

11. The apparatus according to claim 10 wherein the locking shaft is adapted to operatively engage the locking cap upon advancing movement of the rod persuader a predetermined distance thereof whereby rotational movement of the locking shaft causes corresponding rotational movement of the locking cap.

12. The apparatus according to claim 1 wherein the locking shaft defines a central lumen therethrough for reception of the rod persuader, the rod persuader being adapted for longitudinal movement within the locking shaft.

13. The apparatus according to claim 1 wherein the rod persuader includes a proximal end and a distal end, the proximal end of the rod persuader being rotatable relative to the distal end of the rod persuader.

14. The apparatus according to claim 13 wherein the distal end of the rod persuader includes a key structure.

15. The apparatus according to claim 14 wherein the locking shaft includes a keyed recess dimensioned to receive the key structure at the distal end of the rod persuader, whereby rotational movement of the locking shaft causes corresponding rotational movement of the distal end of the rod persuader and the locking cap.

16. The apparatus according to claim 1 wherein the rod persuader is coupled with the locking shaft such that upon movement of the rod persuader to a predetermined position, rotational movement of the locking shaft causes corresponding rotational movement of a distal end of the rod persuader and the locking cap.

17. An apparatus to facilitate securing a spinal rod to an anchoring device, the anchoring device having an open end and a locking cap engageable to the open end, the apparatus comprising:

a body having a proximal end and a distal end;

the body having an anchor engaging portion located at the distal end of the body that is adapted to engage the anchoring device;

a locking shaft disposed within the body, the locking shaft having a proximal end and a distal end;

a rod persuader disposed within the locking shaft, the rod persuader having a proximal end and a distal end, the proximal end and the distal end being rotatable relative to one another, the distal end having a connecting element for releasable attachment to the locking cap;

wherein rotating the proximal end of the rod persuader causes longitudinal advancement of the locking cap toward the spinal rod for urging the spinal rod into the open end of the anchoring device; and

wherein rotation of the locking shaft causes rotational movement of the distal end of the rod persuader relative to the proximal end of the rod persuader for rotating and advancing the locking cap into the open end of the anchoring device, and wherein the proximal end of the rod persuader is threadably engaged to the locking shaft.

18. The apparatus according to claim 17, wherein the anchor engaging portion comprises a pair of jaws.

19. The apparatus according to claim 18, wherein each jaw of the pair of jaws includes detents for releasably engaging corresponding structure of the anchoring device.

20. The apparatus according to claim 18, wherein one of the jaws is a stationary jaw that is fixed relative to the body and the other one of the jaws is movable relative to the body.

21. The apparatus according to claim 17, wherein the distal end of the locking shaft restricts rotational movement of the distal end of the rod persuader.

22. The apparatus according to claim 17, wherein the distal end of the locking shaft includes a keyed recess dimensioned to receive a corresponding keyed structure at the distal end of the rod persuader.

23. The apparatus according to claim 17, wherein the locking shaft defines a central lumen therethrough for reception of the rod persuader.

24. The apparatus according to claim 17, wherein the connecting element at the distal end of the rod persuader is a shaped tip for cooperative engagement with a reception port in the locking cap.

25. The apparatus according to claim 17, wherein the body has a recess that guides the rotational movement of the locking shaft.

26. The apparatus according to claim 25, wherein the recess is located in the proximal end of the body.

27. The apparatus according to claim 25, wherein the locking shaft cooperates with the recess via a pin.

28. The apparatus according to claim 17, wherein the rod persuader has an actuator to facilitate actuating the rod persuader.

29. The apparatus according to claim 28, wherein the actuator is a handle for facilitating rotational movement of the rod persuader.

30. The apparatus according to claim 17, wherein the locking shaft has an actuator to facilitate actuating the rod persuader.

31. The apparatus according to claim 30, wherein the actuator is a handle for facilitating rotational movement of the locking shaft.