Flexible Guide for Insertion of a Vertebral Stabilization System

• US 20100168803A1
• Filed: 12/29/2008
• Published: 07/01/2010
• Est. Priority Date: 12/29/2008
• Status: Active Grant

• Current Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Inventors: Hoffman, Zachary M., Hestad, Hugh D.
• Granted Patent: US 8,137,356 B2
• Time in Patent Office: Days
• US Class Current: 606/86.A
• CPC Class Codes: A61B 17/708 with tubular extensions coaxially mounted on the bone anchors
• CPC Class Codes: A61B 17/7085 for insertion of a longitudinal element down one or more hollow screw or hook extensions, i.e. at least a part of the element within an extension has a component of movement parallel to the extension's axis
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself

Abstract

An installation system for installing a vertebral stabilization system. The system includes an implant guide and an insert. The implant guide includes a handle and a shaft extending from the handle. The distal end of the shaft is configured for engagement with a head portion of a vertebral anchor. The shaft has flexibility characteristics allowing the shaft to flexibly bend between a first configuration and a second configuration. The insert is slidably disposed along the shaft of the implant guide. The insert inhibits the shaft from bending from the second configuration to the first configuration.

Claims

1. A system for implantation of a spinal stabilization system comprising:

an implant guide including a handle and a shaft extending from the handle, a distal end of the shaft configured for engagement with a head portion of a vertebral anchor, the shaft having flexibility characteristics allowing the shaft to flexibly bend between a first configuration and a second configuration; and

an insert slidably disposed along the shaft of the implant guide, wherein the insert inhibits the shaft from bending from the second configuration to the first configuration.

2. The system of claim 1, wherein the shaft of the implant guide includes a first leg spaced from a second leg, wherein the insert is slidably disposed between the first leg and the second leg.

3. The system of claim 2, wherein the insert includes a first rail slidably engaged with a slot extending along the first leg of the shaft, and the insert includes a second rail slidably engaged with a slot extending along the second leg of the shaft.

4. The system of claim 1, wherein the insert includes a curved shaft portion having a curvature.

5. The system of claim 1, wherein the first configuration is a configuration in which the shaft is straight, and the second configuration is a configuration in which the shaft is curved.

6. The system of claim 1, wherein the first configuration is a configuration in which the shaft is curved, and the second configuration is a configuration in which the shaft is straight.

7. The system of claim 1, wherein the insert is a docking member configured to assist in docking the implant guide to a head portion of a vertebral anchor.

8. The system of claim 1, wherein the flexibility characteristics of the shaft include a plurality of slots formed in a portion of the shaft.

9. A system for implantation of a spinal stabilization system comprising:

an implant guide including a handle and a shaft extending from the handle, a distal end of the shaft configured for engagement with a head portion of a vertebral anchor, the shaft being flexible away from an equilibrium configuration; and

an insert slidably disposed along the shaft of the implant guide, the insert including a curved shaft portion having a curvature;

wherein the curved shaft of the insert subjects the shaft of the implant guide into a curved configuration away from the equilibrium configuration.

10. The system of claim 9, wherein the shaft of the implant guide includes a first leg spaced from a second leg, wherein the insert is slidably disposed between the first leg and the second leg.

11. The system of claim 9, wherein the equilibrium configuration is a configuration in which the shaft is straight.

12. A system for use in the installation of a spinal stabilization system comprising:

a vertebral anchor including a head portion and a shaft portion, the head portion including a threaded opening extending into the head portion from an upper end of the head portion;

an implant guide including a handle and a shaft extending from the handle, a distal end of the shaft configured for engagement with the head portion of the vertebral anchor; and

a docking member inserted along the shaft of the implant guide, a distal end of the docking member including a post sized for insertion into the threaded opening of the head portion of the vertebral anchor;

the shaft being slidable relative to the docking member such that in a first configuration the distal end of the shaft is disengaged from the head portion of the vertebral anchor while the post of the docking member is positioned in the threaded opening of the vertebral anchor, and in a second configuration the distal end of the shaft is engaged with the head portion of the vertebral anchor while the post of the docking member is positioned in the threaded opening of the vertebral anchor.

13. The system of claim 12, wherein the shaft includes a slot and the docking member includes a rail slidably disposed in the slot of the shaft.

14. The system of claim 12, wherein the docking member includes a slot and the shaft includes a rail slidably disposed in the slot of the docking member.

15. The system of claim 12, wherein the shaft includes a first leg spaced from a second leg, wherein the docking member is disposed between the first leg and the second leg.

16. The system of claim 15, wherein the first leg includes a first slot and the second leg includes a second slot, and

wherein the docking member includes a first rail slidably disposed in the first slot and a second rail slidably disposed in the second slot.

17. The system of claim 12, wherein the distal end of the shaft includes a first projection and a second projection, and the head portion of the vertebral anchor includes a first opening and a second opening;

wherein in the second configuration the first projection is positioned in the first opening and the second projection is positioned in the second opening.

18. The system of claim 12, further including verification means for verifying when the shaft is positioned in the second configuration.

19. A method of engaging a vertebral anchor with an implant guide, the method comprising:

providing a docking member having a proximal portion and a distal portion;

engaging the distal portion of the docking member with a head portion of a vertebral anchor implanted into a bone of a spinal column;

with the distal portion of the docking member engaged with the head portion of a vertebral anchor, sliding an implant guide along the docking member toward the head portion of the vertebral anchor;

engaging a distal end of the implant guide with the head portion of the vertebral anchor while the distal portion of the docking member remains engaged with the head portion of the vertebral anchor; and

disengaging the distal portion of the docking member from the head portion of the vertebral anchor once the distal end of the implant guide is engaged with the head portion of the vertebral anchor.

20. The method of claim 19, wherein implant guide includes a handle and a shaft extending from the handle, the shaft including a first leg and a second leg;

wherein the docking member is slidably disposed between the first leg and the second leg of the shaft of the implant guide.

21. The method of claim 19, wherein the distal portion of the docking member includes a post, wherein engaging the distal portion of the docking member with the head portion of the vertebral anchor includes inserting the post of the docking member into a threaded opening of the head portion of the vertebral anchor.