Surgical implant

• US 7,794,500 B2
• Filed: 06/08/2005
• Issued: 09/14/2010
• Est. Priority Date: 10/27/2004
• Status: Active Grant

• Current Assignee: Brent A. Felix
• Original Assignee: Brent A. Felix
• Inventors: Felix, Brent A.
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): CARTER, TARA ROSE E
• Application Number:
  US11/147,487
• Publication Number:
  US 20060089716A1
• Time in Patent Office: 1,924 Days
• Field of Search: 623 1711- 1716, 623/16.11
• US Class Current: 623/17.11
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• 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 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30179 X-shaped
• CPC Class Codes: A61F 2002/30565 having spring elements
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2230/0004 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0058 X-shaped

Abstract

A surgical implant includes a first end plate having a substantially X-shaped configuration. A second end plate is spaced apart for the first end plate. A central longitudinal axis centrally extends between the first end plate and the second end plate. Four spaced apart beams extend from the first end plate to the second end plate at location spaced apart form the central longitudinal axis. An open passageway extends between each adjacent pair of the beams and intersects with the central longitudinal axis.

Claims

1. A surgical implant comprising:

a first end plate having four sides and four corners, a substantially V-shaped notch being formed on each side between each adjacent pair of corners so as to give the first end plate a substantially X-shaped configuration;

a second end plate spaced apart from the first end plate, a central longitudinal axis centrally extending between the first end plate and the second end plate;

four spaced apart beams extending from the first end plate to the second end plate at locations spaced apart from the central longitudinal axis, an open passageway extending between each adjacent pair of the beams and intersecting with the central longitudinal axis, wherein the first end plate, the second end plate, and the beams are integrally formed as a one piece construction from a single piece of material and wherein each of the beams has a planar bearing surface, the planar bearing surfaces of two adjacent beams being coplanar; and

a plurality of retention barbs projecting from each of the planar bearing surfaces that are coplanar, at least a portion of each retention barb outwardly projecting orthogonal to the plane of the planar bearing surfaces.

2. The surgical implant of claim 1, wherein the second end plate has a substantially X-shaped configuration.

3. The surgical implant of claim 1, wherein at least one of the beams has a square or rectangular transverse cross section.

4. The surgical implant of claim 1, further comprising a plurality of retention barbs outwardly projecting from each of the planar bearing surfaces at least a portion of each retention barb outwardly projecting orthogonal to the plane of the planar bearing surface from which it projects.

5. The surgical implant of claim 1, wherein the first end plate has an inside face and an outside face and no bounded holes are formed extending between the inside face and the outside face.

6. The surgical implant of claim 1, wherein the first end plate has an inside face and an outside face, the outside face having the configuration of a rounded, outwardly projecting nose that terminates at a rounded apex.

7. The surgical implant of claim 1, wherein the distance between two adjacent beams tapers along the length between the first end plate and the second end plate.

8. The surgical implant of claim 1, further comprising a support structure disposed between the first end plate and the second end plate at a location spaced apart from the first end plate and the second end plate, the support structure connecting to each of the beams and intersecting with the longitudinal axis.

9. The surgical implant of claim 1, wherein the second end plate has an outside face facing away from the first end plate, the outside face having a recessed track formed therein that extends thereacross.

10. The surgical implant of claim 1, further comprising:

the planar bearing surface of each beam longitudinally extending between the first end plate and the second end plate; and

a plurality of spaced apart retention barbs outwardly projecting from each planar bearing surface in a direction that is substantially orthogonal to the plane of the planar bearing surface.

11. The surgical implant of claim 10, wherein a first two of the planar bearing surfaces both define a common first plane and a second two of the planar bearing surfaces both define a common second plane.

12. The surgical implant of claim 11, wherein the first plane and the second plane are parallel to each other.

13. The surgical implant of claim 1, wherein the surgical implant is comprised of a polyetheretherketone polymer.

14. The surgical implant of claim 1, wherein the substantially V-shaped notch formed between the beams having the planar bearing surfaces disposed within the same plane is formed such that no portion of the surgical implant outwardly extends beyond the plane formed by the planar bearing surfaces.

15. A surgical implant for fusing together two adjacent bones or pieces of bone, the surgical implant comprising:

a first end plate comprising a solid central portion and four legs, each leg outwardly projecting from the central portion to a corner disposed on an outer end of the leg so that the first end plate has a substantially X-shaped configuration, the corners being disposed such that when the first end plate is viewed in a top plan view, an imaginary straight line can be drawn between the corners of opposing legs that continuously remains on or in the first end plate;

a second end plate spaced apart from the first end plate;

a plurality of spaced apart beams, each beam longitudinally extending from a corresponding one of the legs of the first end plate to the second end plate, each of the beams having a planar bearing surface, the planar bearing surfaces of two adjacent beams being coplanar; and

a plurality of retention barbs projecting from each of the planar bearing surfaces that are coplanar, at least a portion of each retention barb outwardly projecting orthogonal to the plane of the planar bearing surfaces.

16. The surgical implant of claim 15, wherein the second end plate comprises a central portion and four legs outwardly projecting from the central portion so that the second end plate has a substantially X-shaped configuration.

17. The surgical implant of claim 16, wherein the second end plate is substantially the same size and shape as the first end plate.

18. The surgical implant of claim 16, wherein each of the spaced apart beams extends to a corresponding one of the legs of the second end plate.

19. The surgical implant of claim 16, wherein the first end plate has an inside face facing the second end plate, the inside face having a central portion that is openly exposed.

20. The surgical implant of claim 16, wherein a central longitudinal axis centrally extends between the first end plate and the second end plate, an open passageway extends between each adjacent pair of the beams and intersects with the central longitudinal axis.

21. The surgical implant of claim 20, further comprising a support structure disposed between the first end plate and the second end plate at a location spaced apart from the first end plate and the second end plate, the support structure connecting to each of the beams and intersecting with the central longitudinal axis.

22. The surgical implant of claim 16, wherein the first end plate has an inside face and an outside face, the outside face having the configuration of a rounded, outwardly projecting nose that terminates at a rounded apex.

23. The surgical implant of claim 16, wherein the distance between two adjacent beams tapers along the length between the first end plate and the second end plate.

24. The surgical implant of claim 16, further comprising a plurality of spaced apart retention barbs disposed along the planar bearing surface of each beam so as to outwardly project from the planar bearing surface in a direction that is substantially orthogonal to the plane of the planar bearing surface.

25. The surgical implant of claim 16, wherein the legs to which adjacent beams are connected move toward one another, but do not touch one another in response to the application of a compressive force between the adjacent beams.

26. The surgical implant of claim 16, wherein each of the plurality of beams has a square or rectangular transverse cross-sectional shape.

27. The surgical implant of claim 15, further comprising:

the planar bearing surface of each beam longitudinally extending between the first end plate and the second end plate;

a plurality of spaced apart retention barbs outwardly projecting from each planar bearing surface in a direction that is substantially orthogonal to the plane of the planar bearing surface; and

a first two of the planar bearing surfaces both define a common first plane and a second two of the planar bearing surfaces both define a common second plane.

28. A surgical implant for fusing two adjacent bones or pieces of bone, the implant comprising:

a first end plate;

a second end plate spaced apart from the first end plate along a central longitudinal axis;

four spaced apart beams longitudinally extending from the first end plate to the second end plate; and

a support structure positioned between the first and second end plates at a location spaced apart from the first and second end plates, the support structure comprising a body having four side faces each extending between a top face and an opposing bottom face, the top and bottom faces each intersecting the central longitudinal axis, the side faces each facing a separate direction away from and not intersecting the central longitudinal axis, each pair of adjacent side faces intersecting along a side corner that is superimposed within a corresponding beam, a separate channel being formed on each side face, each channel extending in the longitudinal direction from the top face to the bottom face so as not to intersect the central longitudinal axis, a first top channel being recessed on the top face of the body and extending between two of the side faces of the body.

29. The surgical implant of claim 28, wherein the support structure further comprises a second top channel recessed on the top face of the body and extending between the other two side faces such that the first top channel and the second top channel intersect.

30. The surgical implant of claim 29, wherein the support structure further comprises:

a first bottom channel recessed on the bottom face of the body and extending between two of the side faces; and

a second bottom channel recessed on the bottom face of the body and extending between the other two side faces such that the first bottom channel and the second bottom channel intersect.

31. The surgical implant of claim 30, wherein a first bottom channel recessed on the bottom face of the body of the support structure has a substantially V- or U-shaped configuration.

32. The surgical implant of claim 28, wherein each channel of the support structure has a substantially U- or V-shaped configuration.

33. The surgical implant of claim 28, further comprising at least one bounded tunnel transversely extending through the support structure between two of the side faces.

34. The surgical implant of claim 28, wherein the support structure has a substantially X-shaped configuration when viewed in a central transverse cross-section.

35. The surgical implant of claim 28, wherein the support structure and the beams and the end plates are integrally formed as a unitary structure from a single piece of material.

36. The surgical implant of claim 28, wherein a central longitudinal axis centrally extends between the first end plate and the second end plate and intersects with the support structure, and an open passageway extends between each adjacent pair of the beams and intersects with the central longitudinal axis.

37. The surgical implant of claim 28, wherein:

the first end plate comprises a solid central portion and four legs outwardly projecting from the central portion so that the first end plate has a substantially X-shaped configuration;

the second end plate comprises a solid central portion and four legs outwardly projecting from the central portion so that the second end plate has a substantially X-shaped configuration; and

each beam extends from a corresponding leg of the first end plate to a corresponding leg of the second end plate.

38. The surgical implant of claim 28, wherein the first top channel recessed on the top face of the body of the support structure has a substantially V- or U-shaped configuration.

39. A surgical implant comprising:

a first end plate having four sides and four corners, a V-shaped notch being formed on each side between each adjacent pair of corners so as to give the first end plate a substantially X-shaped configuration;

a second end plate spaced apart from the first end plate, a central longitudinal axis centrally extending between the first end plate and the second end plate;

four spaced apart beams extending from the four corners of the first end plate to the second end plate, an open passageway extending between each adjacent pair of the beams and intersecting with the central longitudinal axis,

wherein each of the beams has a planar bearing surface, the planar bearing surfaces of two adjacent beams being coplanar, and wherein the legs to which adjacent beams are connected move toward one another, but do not touch one another in response to the application of a compressive force between the adjacent beams on the bearing surfaces; and

a plurality of retention barbs projecting from each of the planar bearing surfaces that are coplanar, at least a portion of each retention barb outwardly projecting orthogonal to the plane of the planar bearing surfaces.