Spinal fusion interbody spacer

• US 6,942,698 B1
• Filed: 04/23/2004
• Issued: 09/13/2005
• Est. Priority Date: 04/23/2004
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Roger P. Jackson
• Inventors: Jackson, Roger P.
• Primary Examiner(s): Isabella, David J.
• Application Number:
  US10/831,461
• Time in Patent Office: 508 Days
• Field of Search: 623 1711- 1716, 606/61, 606 69- 74
• US Class Current: 623/17.16
• CPC Class Codes: A61B 2017/0256 for the spine
• 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 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/3013 figure-"8"- or hourglass-shaped
• CPC Class Codes: A61F 2002/30313 pear-shaped
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30795 Blind bores, e.g. of circular cross-section
• CPC Class Codes: A61F 2002/30818 castellated or crenellated
• CPC Class Codes: A61F 2002/3082 Grooves
• 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 2002/4627 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 2230/001 Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2230/0063 Three-dimensional shapes

Abstract

A convex spinal fusion interbody space device includes spaced apart superior and inferior abutment surfaces which are effectively medially convex. The peak of such convexity is displaced anteriorly of a central plane through the device. The spacer device has front to rear lateral concave surfaces and top to bottom lateral side channels that intersect with said convex surfaces. The spacer device has a height which is greater than the width of the device. The spacer device is implanted between a pair of adjacent vertebrae by insertion in a tipped-over orientation and then reoriented to an upright orientation for engagement by facing surfaces of the vertebrae. Fusion promoting bone material is packed between the vertebrae and about the spacer device subsequent to implantation.

Claims

1. A spinal fusion interbody spacer comprising:

a) a body having superior and inferior abutment surfaces sized and shaped to be adapted to abut against adjacent spaced vertebrae;

b) said body having concave lateral side surfaces; and

c) at least one side channel extending between said inferior and superior abutment surfaces and opening laterally onto each lateral side surface.

2. The spacer according to claim 1 wherein:

a) a plurality of side channels opens onto each lateral side surface.

3. The spacer according to claim 2 wherein:

a) there are at least three side channels associated with each lateral side surface.

4. The spacer according to claim 1 wherein:

a) a width of each side channel is approximately one eighth the front to rear length of said spacer.

5. The spacer according to claim 1 wherein:

a) said spacer has a solid central core that is free of pass through openings.

6. The spacer according to claim 1 wherein:

a) said side channels innermost portion generally intersects with said lateral side surfaces innermost portion.

7. The spacer according to claim 1 wherein:

a) said side surfaces include at least one shallow and non pass through tool gripping indent.

8. The spacer according to claim 1 wherein:

a) said inferior and superior surfaces are each functionally curved to form a curved structure from an anterior end to a posterior end of said spacer.

9. The spacer according to claim 8 wherein:

a) said curved structure is convex and formed by placement of discrete planar facets.

10. The spacer according to claim 8 wherein:

a) said curved structure is highest between a center and said anterior end of said spacer.

11. In an interbody spacer having a body with superior and inferior surfaces and a pair of lateral side surfaces;

the improvement comprising;

a) each of said lateral side surfaces being concave and at least one side channel for each side surface extending between said inferior and superior surfaces and opening laterally outward onto respective side surfaces;

each side channel opening laterally outward along the entire length thereof.

12. The spacer according to claim 11 wherein:

a) said side surfaces are and have an axis associated therewith that extends parallel to a front to rear central axis of said spacer.

13. The spacer according to claim 12 wherein:

a) an innermost portion of each side channel generally intersects an innermost portion of a respective side surface.

14. The spacer according to claim 12 wherein:

a) there are a plurality of side channels that open onto each side surface.

15. The spacer according to claim 14 wherein:

a) there are at least three side channels associated with each side surface.

16. The spacer according to claim 12 wherein:

a) each side channel has a width that is approximately one eighth the anterior to posterior length of said spacer.

17. A method of providing intervertebral support for a patient comprising the steps of:

a) providing a vertebral spacer having concave lateral side surfaces and being sized and shaped to be positioned between a pair of vertebrae;

b) placing at least one lateral side channel on each lateral side of said spacer so as to intersect with said concave lateral side surfaces wherein each said side channel runs from the top to the bottom of the spacer and opens laterally outward along the entire length of said side channel;

c) placing said spacer between a pair of vertebrae; and

d) allowing bone growth through said side channels to promote spacer stability.

18. A spinal fusion interbody spacer comprising:

a) a body having superior and inferior abutment surfaces sized and shaped to be adapted to abut against adjacent spaced vertebrae;

b) said body having lateral side surfaces;

said side surfaces are arced and concave having a central axis extending from front to rear; and

c) at least one side channel extending between said inferior and superior abutment surfaces and opening laterally onto each lateral side surface.

19. A spinal fusion interbody spacer comprising:

a) a body having superior and inferior abutment surfaces sized and shaped to be adapted to abut against adjacent spaced vertebrae;

b) said body having lateral side surfaces; and

c) at least one side channel extending between said inferior and superior abutment surfaces and opening laterally onto each lateral side surface;

each of said side channels being curved at an innermost end thereof so as to have a radius of curvature extending between the inferior and superior abutment surfaces.

20. A spinal fusion interbody spacer comprising:

a) a body having superior and inferior abutment surfaces sized and shaped to be adapted to abut against adjacent spaced vertebrae;

b) said body having at least one concave lateral side surface; and

c) at least one side channel extending between said inferior and superior abutment surfaces and opening laterally onto said lateral side surface.