Spinal implant

• US 5,716,415 A
• Filed: 03/08/1996
• Issued: 02/10/1998
• Est. Priority Date: 10/01/1993
• Status: Expired due to Term

• Current Assignee: Depuy Acromed Incorporated (Johnson & Johnson)
• Original Assignee: AcroMed Corp (Johnson & Johnson)
• Inventors: Steffee, Arthur D.
• Primary Examiner(s): Milano, Michael J.
• Application Number:
  US08/612,674
• Time in Patent Office: 704 Days
• Field of Search: 623/16, 623/17, 606/61, 606/99
• US Class Current: 623/17.16
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• 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 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30261 parallelepipedal
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/448 comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
• CPC Class Codes: A61F 2002/4622 having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2230/0026 trapezoidal
• CPC Class Codes: A61F 2230/0082 parallelepipedal

Abstract

A spinal implant for use in distracting and maintaining spinal disc height while promoting fusion of adjacent vertebrae of a spinal column includes first and second side surfaces extending substantially parallel to each other. Upper and lower surfaces for engaging the adjacent vertebrae extend between the first and second side surfaces and extend from a first end portion to a second end portion of the spinal implant. The spinal implant includes recesses located in the first and second side surfaces for receiving an instrument to rotate the spinal implant. A method of fusing together the adjacent vertebrae using the spinal implant includes removing at least a portion of the spinal disc between the adjacent vertebrae. The spinal implant is inserted between the adjacent vertebrae with the first and second parallel side surfaces facing the adjacent vertebrae. The spinal implant is rotated into a position in which the parallel side surfaces extend from one of the adjacent vertebrae to the other adjacent vertebrae and the upper and lower surfaces engage the adjacent vertebrae.

Claims

1. A spinal implant for use in fusing together adjacent vertebrae of a spinal column comprising:

first and second side surfaces extending substantially parallel to each other;

upper and lower surface means for engaging the adjacent vertebrae extending between said first and second side surfaces, said spinal implant having a first position between the adjacent vertebrae in which said first and second side surfaces face the adjacent vertebrae and a second position in which said upper and lower surface means engage the adjacent vertebrae and said first and second side surfaces extend from one of the adjacent vertebrae to another of the adjacent vertebrae;

first and second end portions; and

means for engaging a tool for rotation of said spinal implant from said first position in which said first and second side surfaces face the adjacent vertebrae to said second position in which said upper and lower surface means engage the adjacent vertebrae, said tool engaging means including first and second surface means on said first and second side surfaces, respectively, for engaging the tool, said first and second surface means including means for enabling rotation of said spinal implant from said first position to said second position.

2. A spinal implant as set forth in claim 1 wherein said upper and lower surface means extend from said first end portion to said second end portion, said upper and lower surface means adjacent said first end portion being spaced apart by a first distance and said upper and lower surface means adjacent said second end portion being spaced apart by a second distance greater than the first distance.

3. A spinal implant as set forth in claim 1 further including at least one opening extending through said spinal implant.

4. A spinal implant as set forth in claim 3 wherein said opening extends from said upper surface means to said lower surface means.

5. A spinal implant as set forth in claim 3 wherein said opening extends from said first side surface to said second side surface.

6. A spinal implant as set forth in claim 5 further including a plurality of openings extending from said first side surface to said second side surface.

7. A spinal implant as set forth in claim 6 wherein said openings extend substantially perpendicular to said first and second side surfaces.

8. A spinal implant as set forth in claim 5 further including an opening extending from said upper surface means to said lower surface means.

9. A spinal implant as set forth in claim 8 wherein said opening extending from said upper surface means to said lower surface means intersects said opening extending from said first side surface to said second side surface.

10. A spinal implant as set forth in claim 1 wherein said upper and lower surface means include teeth for engaging the adjacent vertebrae.

11. A spinal implant as set forth in claim 10 wherein said teeth on said upper and lower surface means are triangular shaped.

12. A spinal implant as set forth in claim 11 wherein each of said teeth includes a first surface facing toward said first end portion and a second surface extending from said first surface of said tooth and facing said second end portion, said first and second surfaces of said tooth intersecting each other to form an edge, said first surface extending at an acute angle to a plane containing an edge of said first surface opposite from said edge defined by the intersection of said first and second surfaces and containing an edge of said second surface opposite from said edge defined by the intersection of said first and second surfaces, said second surface extending at an acute angle to the plane equal to the acute angle that said first surface extends from said plane.

13. A spinal implant as set forth in claim 12 wherein said first surface extends perpendicular to said second surface.

14. A spinal implant as set forth in claim 1 wherein said means for engaging a tool comprises recesses in said first and second side surfaces for receiving the tool for grasping and rotating said spinal implant.

15. A spinal implant as set forth in claim 2 wherein said means for engaging a tool comprises recesses located adjacent said first end portion of said spinal implant.

16. A spinal implant for use in fusing together adjacent vertebrae of a spinal column comprising:

first and second side surface means for extending from one of the adjacent vertebrae to the other of the adjacent vertebrae, said first and second side surface means being spaced apart a first distance;

upper and lower surface means for engaging the adjacent vertebrae extending between said first and second side surface means, said upper and lower surface means being spaced apart a second distance greater than the first distance; and

first and second end portions;

said spinal implant having a first position between the adjacent vertebrae in which said first and second side surface means face the adjacent vertebrae and a second position in which said upper and lower surface means engage the adjacent vertebrae and said first and second side surface means extend from one of the adjacent vertebrae to another of the adjacent vertebrae, said spinal implant being rotatable about an axis extending through said first and second end portions from said first position in which said first and second side surface means face the adjacent vertebrae to said second position in which said upper and lower surface means engage the adjacent vertebrae and said first and second side surface means extend from one of the adjacent vertebrae to another of the adjacent vertebrae; and

first and second tool engaging surface means located on said first and second side surface means, respectively, for engaging a tool for rotating said spinal implant, said first and second tool engaging means including means for enabling rotation of said spinal implant from said first position to said second position.

17. A spinal implant as set forth in claim 16 wherein said first and second side surface means extend substantially parallel to each other.

18. A spinal implant as set forth in claim 16 wherein said upper and lower surface means extend from said first end portion to said second end portion, said upper and lower surface means adjacent said first end portion being spaced apart by a third distance and said upper and lower surface means adjacent said second end portion being spaced apart by a fourth distance greater than the third distance.

19. A spinal implant as set forth in claim 16 further including at least one opening extending through said spinal implant.

20. A spinal implant as set forth in claim 16 wherein said upper and lower surface means include teeth for engaging the adjacent vertebrae.

21. A spinal implant as set forth in claim 20 wherein each of said teeth includes a first surface facing toward said first end portion and a second surface extending from said first surface of said tooth and facing said second end portion, said first and second surfaces of said tooth intersecting each other to form an edge, said first surface extending at an acute angle to a plane containing an edge of said first surface opposite from said edge defined by the intersection of said first and second surfaces and containing an edge of said second surface opposite from said edge defined by the intersection of said first and second surfaces, said second surface extending at an acute angle to the plane equal to the acute angle that said first surface extends from said plane.