Spinal facet cage implant

• US 10,172,721 B2
• Filed: 05/09/2016
• Issued: 01/08/2019
• Est. Priority Date: 06/06/2008
• Status: Active Grant

• Current Assignee: Providence Technologies, Inc.
• Original Assignee: Providence Technologies, Inc.
• Inventors: McCormack, Bruce M., Liou, Edward, Schummers, David Michael, Smith, Jeffrey D.
• Primary Examiner(s): Beccia, Christopher
• Application Number:
  US15/149,781
• Publication Number:
  US 20160317316A1
• Time in Patent Office: 974 Days
• Field of Search: 623 1711- 1716
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/1735 for rasps or chisels
• CPC Class Codes: A61B 17/1757 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 17/8819 characterised by the introducer proximal part, e.g. cannula handle, or by parts which are inserted inside each other, e.g. stylet and cannula A61B17/8825 takes precedence
• CPC Class Codes: A61B 2017/00424 ergonomic, e.g. fitting in fist
• CPC Class Codes: A61B 2017/00429 with a roughened portion
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61B 2017/320028 with reciprocating movements
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61B 2090/037 with a frangible part, e.g. by reduced diameter
• 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 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30378 Spherically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30777 : Oblong apertures
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30789 : perpendicular with respect to each other
• CPC Class Codes: A61F 2002/30828 : parallel
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30843 : Pyramidally-shaped
• CPC Class Codes: A61F 2002/30845 : with cutting edges
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4629 : connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2220/0016 : with sharp anchoring protrusions, e.g. barbs, pins, spikes

Abstract

Implementations described and claimed herein provide a spinal facet cage implant for implantation in a spinal facet joint. In one implementation, the implant includes a distal leading end, a proximal trailing end, a first face, and a second face. The distal leading end has a distal surface generally opposite a proximal surface of the proximal trailing end. The first face has a first surface that is generally parallel with a second surface of the second face. The first and second faces extend between the distal leading end and the proximal trailing end. The first and second surfaces having one or more textured features adapted to provide friction with the spinal facet joint. One or more windows are defined in the first and/or second surfaces, and one or more side windows are defined in the first and/or second side surfaces.

Claims

1. An implant for implantation in a spinal facet joint, the implant comprising:

a distal leading portion having a distal end surface generally opposite a proximal end surface of a proximal trailing end;

a first side having a first side surface generally opposite a second side having a second side surface;

a first face having a first surface that is generally opposite a second surface of a second face, the first and second faces extending between a portion of the distal leading portion and the proximal trailing end, the first and second surfaces having one or more discrete textured features, wherein at least one of the one or more of the textured features is a tooth comprising an inner side surface generally opposite an outer side surface, the outer side surface is adjacent to a respective side surface of the first or second side and at least a portion of the inner side surface is generally perpendicular to the first surface of the first face or the second surface of the second face;

one or more windows defined in the first surface generally opposing one or more windows defined in the second surface; and

one or more side windows defined in the first side surface generally opposing one or more windows defined in the second side surface, the windows and side windows providing access to a hollow interior of the implant.

2. The implant of claim 1, wherein the textured features include a ridge extending perpendicularly from each of the first and second surfaces along at least a portion of the length of the first and second surfaces, the ridge defined by the one or more teeth wherein the distal surface is a leading distal face, the proximal surface is a trailing proximal face, and a tip is formed at an intersection between the leading distal face and the trailing proximal face.

3. The implant of claim 2, wherein the trailing proximal face has a slope that is greater than a slope of the leading distal face.

4. The implant of claim 2, wherein the ridges extend across the first and second surfaces of the first and second faces from the first side to the second side.

5. The implant of claim 1, wherein the textured features include a plurality of protrusions extending perpendicularly from each of the first and second surfaces.

6. The implant of claim 5, wherein the protrusions each have a pyramidal shape with a rectangular base that is generally parallel to a respective surface of the first face and the second face.

7. The implant of claim 5, wherein the protrusions form one of small pyramids or large pyramids.

8. The implant of claim 5, wherein the protrusions are arranged in rows, a first row of the protrusions abutting a second row of the protrusions.

9. The implant of claim 1, wherein the textured features include a plurality of grit particles extending generally perpendicularly from a respective surface of the first face and the second face and the grit particles are randomly adhered to the surfaces of the first face and the second face.

10. The implant of claim 1, wherein the textured features include a plurality of pits extending generally perpendicularly into a respective surface of the first face and the second face.

11. The implant of claim 10, wherein the plurality of pits cover a respective surface of the first face and the second face in a random orientation.

12. The implant of claim 10, wherein the plurality of pits are achieved as a result of surface treating the surfaces of the first face and the second face.

13. The implant of claim 1, wherein the windows and the side windows are rectangular in shape.

14. The implant of claim 1, wherein the windows are circular in shape.

16. The implant of claim 2, wherein the trailing proximal face has a slope that is less than a slope of the leading distal face.

17. The implant of claim 2, wherein the trailing proximal face has a slope that is approximately the same as a slope of the leading distal face.

18. The implant of claim 1, wherein the spinal facet joint is a cervical facet joint.

20. The implant of claim 1, wherein the at least one of the one or more of the textured features further comprises a proximal surface and a distal surface and the proximal surface is adjacent to and in a same plane as at least a portion of the proximal end surface of the proximal trailing end.

15. A spinal facet cage implant for implantation in a spinal facet joint, the implant comprising:

a distal leading portion having a distal end surface generally opposite a proximal end surface of a proximal trailing end;

a first side having a first side surface generally opposite a second side having a second side surface;

a first face having a first surface that is generally opposite a second surface of a second face, the first and second faces extending between at least a portion of the distal leading portion and the proximal trailing end, the first and second surfaces having one or more discrete textured features, wherein at least one of the one or more of the textured features is a tooth comprising an inner side surface generally opposite an outer side surface, the outer side surface is adjacent to a respective side surface of the first or second side and at least a portion of the inner side surface is generally perpendicular to the first surface of the first face or the second surface of the second face;

a set of distal windows positioned near the distal leading portion and including a distal window defined in the first surface of the first face and a distal side window defined in the side surface of the first side, the set of distal windows providing an opening to a distal chamber in an interior of the implant; and

a set of proximal windows positioned near the proximal trailing end and including a proximal window defined in the first surface of the first face and a proximal side window defined in the side surface of the first side the set of proximal windows providing an opening to a proximal chamber in an interior of the implant.

19. The implant of claim 15, wherein the spinal facet joint is a cervical facet joint.