Spinal plug for a minimally invasive facet joint fusion system

• US 7,708,761 B2
• Filed: 09/22/2005
• Issued: 05/04/2010
• Est. Priority Date: 11/22/2004
• Status: Expired due to Fees

• Current Assignee: minSURG International Incorporated
• Original Assignee: minSURG International Incorporated
• Inventors: Petersen, David A.
• Primary Examiner(s): Stewart; Alvin J.
• Application Number:
  US11/232,519
• Publication Number:
  US 20060111782A1
• Time in Patent Office: 1,685 Days
• Field of Search: 623/16.11, 623/18.11, 623 1711- 1716, 606246-249, 606/60, 606 95- 99
• US Class Current: 606/247
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/7064 Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/4405 for apophyseal or facet joints, i.e. between adjacent spinous or transverse processes devices implanted between spinous or transverse processes A61B17/7062
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30881 Circumferential ribs, flanges or fins
• CPC Class Codes: A61F 2310/00359 Bone or bony tissue
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 27/3608 Bone, e.g. demineralised bone matrix [DBM], bone powder

Abstract

A frustum shaped body has an aperture in a top surface and a pair of first and second opposed apertures in a side surface, first and second horizontal internal channels connect both the first and second opposed apertures. A vertical channel from the top aperture connects with the first and second channels. After the body is inserted into a hole in a facet joint, compatible synthetic or biologic material is inserted into the vertical channel until the material exits from the first and second apertures in the side surface. At least one pair of flanges on a portion of an exterior side surface of the body acts as a detent to hold the body in place within the facet joint hole.

Claims

1. An arthroscopic type portal facet surgical method comprising:

placing a portal into a human patient through a minimally invasive incision in the tissue of said human patient;

accessing a facet joint through said portal, wherein said facet joint comprises a first facet joint bone and a second facet joint bone, and wherein said first facet joint bone comprises a first articulated surface and said second facet joint bone comprises a second articulated surface, and wherein said first articulated surface and said second articulated surface face each other at said facet joint;

inserting a drill bit into said portal;

drilling a hole with said drill bit into said facet joint between said first articulated surface and said second articulated surface through said portal;

removing said drill bit from said hole through said portal;

inserting a facet joint fusion plug into said hole through said portal;

inserting a tamping instrument into said portal; and

tamping said facet joint fusion plug into said hole with said tamping instrument through said portal.

2. The method of claim 1, wherein said facet joint fusion plug comprises a material selected from one or more of the group consisting of a synthetic bone substitute, a metal bone substitute, a harvested compacted iliac crest graft, an autologous autograft and a cadaveric allograft.

3. The method of claim 1, wherein said hole is a void created by removal of a portion of bone from each of said first articulated surface and said second articulated surface,

wherein after said removal said remaining portions of said bones define said hole as conically shaped and

said hole has a shape allowing said facet joint fusion plug to be tamped into said hole.

4. The method of claim 1, wherein said portal comprises an arthroscopic type portal.

5. The method of claim 4, wherein said step of placing said portal into said human patient comprises placing a drill guide into said human patient, wherein said drill guide comprises said arthroscopic type portal.

6. The method of claim 5, wherein said drill guide comprises teeth for maintaining the drill guide proximate to said facet joint.

7. The method of claim 1, wherein said facet joint fusion plug comprises a cadaveric allograft.

8. The method of claim 1, wherein said tamping compresses said facet joint fusion plug in said hole.

9. A method according to claim 1, wherein said facet joint fusion plug comprises a material that can be integrated into said facet joint through bone ingrowth.

10. A method according to claim 1, wherein said facet joint fusion plug comprises a material selected from the group consisting of synthetic cortical bone graft and synthetic nonmetallic bone substitute.

11. An arthroscopic type portal facet surgical method comprising:

placing a portal into a human patient through a minimally invasive incision in the tissue of said human patient;

accessing a facet joint through said portal, wherein said facet joint comprises a first facet joint bone and a second facet joint bone, and wherein said first facet joint bone comprises a first articulated surface and said second facet joint bone comprises a second articulated surface, and wherein said first articulated surface and said second articulated surface face each other at said facet joint;

inserting a drill bit into said portal;

drilling a hole with said drill bit into said facet joint between said first articulated surface and said second articulated surface through said portal;

removing said drill bit from said hole through said portal;

inserting a facet joint fusion plug into said hole through said portal; and

pushing said facet joint fusion plug into said hole through said portal, wherein said facet joint fusion plug comprises bone.

12. The method of claim 11, wherein said hole is a void created by removal of a portion of bone from each of said first articulated surface and said second articulated surface, and

wherein after said removal said remaining portions of said bones define said hole as conically shaped;

and

said hole has a shape allowing said facet joint fusion plug to be pushed into said hole.

13. The method of claim 11, wherein said bone of said facet joint fusion plug comprises bone from a cadaveric allograft.

14. The method of claim 11, wherein said pushing compresses said facet joint fusion plug in said hole.

15. The method of claim 11, wherein said portal comprises an arthroscopic type portal.

16. The method of claim 15, wherein said step of placing said portal into said human patient comprises placing a drill guide into said human patient, wherein said drill guide comprises said arthroscopic type portal.

17. The method of claim 16, wherein said drill guide comprises teeth for maintaining the drill guide proximate to said facet joint.

18. The method of claim 11, wherein said facet joint fusion plug comprises a material that can be integrated into said facet joint through bone ingrowth.

19. The method of claim 11, wherein said facet joint fusion plug comprises a material selected from the group consisting of synthetic cortical bone graft and synthetic nonmetallic bone substitute.

20. The method of claim 11, wherein said facet joint fusion plug comprises a material selected from one or more of the group consisting of a synthetic bone substitute, a metal bone substitute, a harvested compacted iliac crest graft, an autologous autograft and a cadaveric allograft.