RETRACTION DEVICES, SYSTEMS, AND METHODS FOR MINIMALLY INVASIVE SPINAL SURGERY

• US 20160038195A1
• Filed: 08/10/2015
• Published: 02/11/2016
• Est. Priority Date: 08/08/2014
• Status: Active Application

• Current Assignee: K2M, Inc (Stryker Corporation)
• Original Assignee: K2M, Inc (Stryker Corporation)
• Inventors: Genovese, Daniel, Young, Collin
• Granted Patent: US 10,258,228 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 1/32 Devices for opening or enlarging the visual field, e.g. of a tube of the body dilators A61M29/00
• CPC Class Codes: A61B 17/0206 with antagonistic arms as supports for retractor elements
• CPC Class Codes: A61B 17/0218 for minimally invasive surgery A61B17/0281, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/7082 for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws driving other bone screws A61B17/8875

Abstract

A system for mounting a retractor tube to a spine without a guidewire is disclosed. The system includes an awl, a first dilator configured to be advanced over the awl, a retractor tube configured to be advanced over the first dilator, wherein an outer surface of the retractor tube defines a plurality of channels, and a plurality of pins adapted to be received within the plurality of channels, wherein the plurality of pins secure the retractor tube to the at least one vertebral body of the spine. A method for selectively mounting a retractor tube to a spine without a guidewire is also disclosed.

Claims

1. A system for mounting a retractor tube comprising:

an awl including an elongate body that extends between proximal and distal ends, the proximal end supporting a handle, the distal end having a bone engaging tip adapted to secure the awl to a vertebral body;

a first dilator having proximal and distal ends, the first dilator defining a longitudinal axis that extends between the proximal and distal ends of the first dilator, and a first longitudinal bore that extends through the first dilator, the first longitudinal bore adapted to receive the awl;

a refractor tube having a tubular body that extends between proximal and distal ends, the tubular body having an inner surface and an outer surface, the inner surface defining a second longitudinal bore that extends through the tubular body, the outer surface defining a plurality of channels; and

a plurality of pins adapted to be received within the plurality of channels of the retractor tube to enable the plurality of pins to secure the retractor tube to a vertebral body.

2. The system according to claim 1, wherein the first longitudinal bore has a diameter that is greater than a diameter of the elongate body of the awl.

3. The system according to claim 2, further including a second dilator, the second dilator defining a third longitudinal bore therethrough adapted for receiving the first dilator.

4. The system according to claim 3, wherein the second dilator has an outer surface that defines a spiral groove adapted to engage the inner surface of the retractor tube.

5. The system according to claim 1, wherein the awl has a removable handle.

6. The system according to claim 5, wherein the removable handle defines a fourth longitudinal bore configured to receive a portion of the elongate body of the awl.

7. The system according to claim 6, wherein the fourth longitudinal bore includes a D-shaped channel adapted to receive a D-shaped extension depending from the proximal end of the elongate body of the awl.

8. The system according to claim 1, wherein the distal end of the first dilator includes an outer surface that tapers in a distal direction along the longitudinal axis.

9. The system according to claim 1, wherein the distal end of the retractor tube is tapered.

10. The system according to claim 1, wherein each pin of the plurality of pins has a shank and a head, the shank configured to be received by at least one of plurality of channels of the retractor tube.

11. The system according to claim 1, further including a screw inserter capable of supporting a retractor and a pedicle screw, the screw inserter being advanceable within the retractor tube and capable of securing the pedicle screw to a vertebral body.

12. The system according to claim 1, wherein the system is provided in the form of a kit.

13. A method for selectively mounting a retractor tube to a spine comprising:

securing an awl to a vertebral body;

advancing a first dilator over the awl;

advancing a retractor tube over the at least one dilator;

introducing at least two pins through a plurality of channels defined in an outer surface of the retractor tube and into the vertebral body to secure the retractor tube to the vertebral body; and

removing the first dilator and the awl from the retractor tube.

14. The method of claim 13, further comprising advancing a second dilator over the awl.

15. The method of claim 13, further including securing at least one of the at least two pins to a facet of the vertebral body.

16. The method of claim 13, further including securing at least one of the at least two pins to a transverse process of the vertebral body.

17. The method of claim 14, wherein removing the first dilator further includes removing the first dilator and the second dilator from the retractor tube.

18. The method of claim 13, further including advancing a screw inserter supporting a retractor and a pedicle screw into the retractor tube to secure the pedicle screw to the vertebral body.

19. The method of claim 18, further including removing the retractor tube and the at least two pins from the vertebral body while maintaining the retractor and the pedicle screw secured to the vertebral body.