Spinal facet cage implant

• US 9,333,086 B2
• Filed: 09/25/2013
• Issued: 05/10/2016
• Est. Priority Date: 06/06/2008
• Status: Active Grant

• Current Assignee: Providence Medical Technology, Inc.
• Original Assignee: Providence Medical Technology, Inc.
• Inventors: McCormack, Bruce M., Liou, Edward, Schummers, David Michael, Smith, Jeffrey D.
• Primary Examiner(s): Beccia, Christopher
• Application Number:
  US14/037,198
• Publication Number:
  US 20140100657A1
• Time in Patent Office: 958 Days
• Field of Search: 606246-279, 623 1711- 1716
• US Class Current: 1/1
• 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 end having a distal surface generally opposite a proximal surface of a proximal trailing end;

a first surface and a second surface, the first and second surfaces extending between the distal surface and the proximal surface and sloping away from each other from the distal surface to the proximal surface such that a height of the proximal surface is greater than a height of the distal surface, the first and second surfaces having one or more textured features adapted to provide friction with the spinal facet joint;

a first side surface generally opposite a second side surface;

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 side windows defined in the second side surface, the windows and side windows providing access to a hollow interior of the implant,

wherein the textured features include;

a first ridge extending along an entire length of the first and second side surface, the first ridge including;

a plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of first teeth including an inner surface generally opposite an outer surface the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the first side surface, and

another plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of first teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the first side surface; and

a second ridge extending along an entire length of the second side surface, the second ridge including;

a plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the second side surface, and

another plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the second side surface; and

for each of the pluralities of teeth;

each tooth has a height extending from the tooth'"'"'s tip to a respective first or second surface;

the plurality includes a distal tooth that is proximate to the distal leading end, a proximal tooth that is proximate to the proximal trailing end, and a centered tooth between the distal tooth and the proximate tooth; and

the height of the centered tooth is greater than the heights of the distal and proximal teeth.

2. The implant of claim 1, wherein, for at least one tooth of the pluralities of teeth, the trailing proximal face has a slope that is greater than a slope of the leading distal face.

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

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

6. The implant of claim 1, wherein a length of the implant extending from the distal end to the proximal end is approximately 0.472 inches.

7. The implant of claim 1, wherein a height of the implant extending from the first surface to the second surface is approximately 0.127 inches.

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

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

a first surface and a second surface, the first and second surfaces extending between the distal leading end and the proximal trailing end and sloping away from each other from the distal surface to the proximal surface such that a height of the proximal surface is greater than a height of the distal surface, the first and second surfaces having one or more textured features adapted to provide friction with the spinal facet joint;

a first side surface generally opposite a second side surface;

a set of distal windows positioned near the distal leading end and including a distal window defined in the first surface and a distal side window defined in the first side surface, the distal window and the distal side window extending along a portion of a length of the implant 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 and a proximal side window defined in the first side surface, the proximal window and the proximal side window extending along a portion of a length of the implant, the set of proximal windows providing an opening to a proximal chamber in an interior of the implant

wherein the textured features include;

a first ridge extending along an entire length of the first and second side surface, the first ridge including;

a plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of first teeth including an inner surface generally opposite an outer surface. the inner surface forming a substantially right angle with the first surface, and the outer surface

being coplanar and coextensive with the first side surface, and

another plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of first teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the first side surface; and

a second ridge extending along an entire length of the second side surface, the second ridge including;

a plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the second side surface, and

another plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the second side surface; and

each of the pluralities of teeth includes a distal tooth that is proximate to the distal leading end, and the proximal surface is planar and coextensive with the trailing proximal face of at least one of the distal teeth.

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

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

a first surface and a second surface, the first and second surfaces extending between the distal surface and the proximal surface and sloping away from each other from the distal surface to the proximal surface such that a height of the proximal surface is greater than a height of the distal surface, the first and second surfaces having one or more textured features adapted to provide friction with the spinal facet joint;

a first side surface generally opposite a second side surface;

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 side windows defined in the second side surface, the windows and side windows providing access to a hollow interior of the implant,

wherein the textured features include;

a first ridge extending along an entire length of the first and second side surface, the first ridge including;

a plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of first teeth including an inner surface generally opposite an outer surface. the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the first side surface, and

another plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of first teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the first side surface; and

a second ridge extending along an entire length of the second side surface, the second ridge including;

a plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the second side surface, and

another plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the second side surface; and

each of the pluralities of teeth includes a distal tooth that is proximate to the distal leading end, and

the proximal surface is planar and coextensive with the trailing proximal face of at least one of the distal teeth.

9. The implant of claim 8, wherein, for at least one tooth of the pluralities of teeth, the trailing proximal face has a slope that is greater than a slope of the leading distal face.

10. The implant of claim 8, wherein the windows and the side windows are rectangular in shape.

11. The implant of claim 8, wherein the windows are circular in shape.