Banana cage

• US 7,500,991 B2
• Filed: 12/31/2002
• Issued: 03/10/2009
• Est. Priority Date: 12/31/2002
• Status: Expired

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: Depuy Acromed Incorporated (Johnson & Johnson)
• Inventors: Bartish, Charles M. Jr., Moore, Bradley Thomas, Bireley, Douglas Scott
• Primary Examiner(s): Philogene; Pedro
• Application Number:
  US10/334,599
• Publication Number:
  US 20040127990A1
• Time in Patent Office: 2,261 Days
• Field of Search: 623 1711- 1716, 606/61
• 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 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• 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 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30151 rhomboidal or parallelogram-shaped
• CPC Class Codes: A61F 2002/30308 banana-shaped
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30593 hollow
• 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 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• 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 2002/4629 : connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0063 : Three-dimensional shapes
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation
• CPC Class Codes: A61F 2250/0097 : Visible markings, e.g. indicia
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite

Abstract

A banana shaped intevertebral fusion cage having a domed profile, an internal planar wall defining first and second graft chambers, asymmetrically disposed leading and trailing insertion, and an anterior wall recess.

Claims

1. An intervertebral fusion device comprising:

a) an anterior wall and a posterior wall defining a width therebetween, wherein the anterior wall has a convex shape and the posterior wall has a concave shape to define a banana shape adapted for non-linear insertion from a posterior side of a spine,

b) first and second end walls between the anterior and posterior walls and defining a length therebetween, and

c) an upper bearing surface and a lower bearing surface, each having a midline having a recessed ridge running in the anterior-posterior direction and bisecting a right and left side of the device,

c) a internal planar wall extending transversely from the anterior wall to the posterior wall, and from the upper bearing surface to the lower bearing surface, to define first and second graft chambers,

wherein the anterior wall has a middle portion, lateral end portions, each having a maximum height, and the maximum height of the middle portion is greater than the maximum height of the lateral end portions,

wherein the width of the device is less than the length of the device, and

wherein the length is less than ½

a width of a disc space.

2. The device of claim 1 wherein the length is less than one-third of the width of the disc space.

3. The device of claim 1 wherein a posterior portion of each bearing surface is adapted to bear against an anterior one-third of the disc space.

4. The device of claim 1 being an integral unit.

5. The device of claim 1 wherein the posterior wall has a concave horizontal cross section.

6. The device of claim 1 wherein the anterior wall has a maximum height, the posterior wall has a maximum height, and wherein the maximum height of the anterior wall is greater than the maximum height of the posterior wall.

7. The device of claim 1 wherein the first end wall is a leading end wall adapted for insertion into the disc space, and the leading end wall is tapered.

8. An intervertebral fusion device adapted for non-linear insertion into a disc space comprising:

a) an anterior wall having a convex shape,

b) a posterior wall,

c) first and second end walls between the anterior and posterior walls

d) an upper bearing surface between the anterior and posterior walls, and having an anterior portion and a posterior portion, and

e) a lower bearing surface between the anterior and posterior walls,

f) first and second transverse struts extending from the anterior portion of the upper bearing surface to the posterior portion of the upper bearing surface,

wherein the anterior wall has a middle portion having a maximum height and lateral end portions each having a maximum height, and the maximum height of the middle portion is greater than the maximum height of the lateral end portions to provide a dome shape,

wherein the upper and lower bearing surfaces each have a midline having a recessed ridge running in the anterior-posterior direction and bisecting a right and left side of the device.

9. The device of claim 8 wherein the posterior portion of each bearing surface is adapted to bear against an anterior one-third of the disc space.

10. The device of claim 8 being an integral unit.

11. The device of claim 8 wherein the posterior wall has a concave horizontal cross section.

12. The device of claim 8 adapted for non-linear insertion from a posterior side of the spine.

13. The device of claim 8 wherein the anterior wall has a maximum height, the posterior wall has a maximum height, and wherein the maximum height of the anterior wall is greater than the maximum height of the posterior wall.

14. The device of claim 8 wherein the first end wall is a leading end wall adapted for insertion into the disc space, and the leading end wall is tapered.

15. The device of claim 8 wherein the upper bearing surface comprises at least one upper opening comprising between 30 areal % and 60 areal % of the upper surface.

16. The device of claim 8 wherein the anterior wall has a middle portion, lateral end portions, each having a maximum height, and the maximum height of the middle portion is greater than the maximum height of the lateral end portions.

17. An intervertebral fusion device comprising:

a) an anterior wall having a leading end and a trailing end

b) a posterior wall having a leading end and a trailing end,

c) a leading end wall connecting the leading ends of the anterior and posterior walls and having a leading insertion hole,

d) a trailing end wall connecting the anterior and posterior walls and having a trailing insertion hole,

e) an upper bearing surface between the anterior and posterior walls, and having an anterior portion and a posterior portion, and

f) a lower bearing surface between the anterior and posterior walls,

wherein the anterior and posterior walls define a centerline therebetween, and

wherein the leading and trailing insertion holes are disposed asymmetrically about the centerline

wherein the upper and lower bearing surfaces each have a midline having a recessed ridge running in the anterior-posterior direction and bisecting a right and left side of the device.

18. The device of claim 17 being an integral unit.

19. The device of claim 17 wherein the posterior wall has a concave horizontal cross section.

20. The device of claim 17 adapted for non-linear insertion from a posterior side of a spine.

21. The device of claim 17 wherein the anterior wall has a maximum height, the posterior wall has a maximum height, and wherein the maximum height of the anterior wall is greater than the maximum height of the posterior wall.

22. The device of claim 17 wherein the leading end wall is tapered.

23. The device of claim 17 wherein the anterior wall has a middle portion, lateral end portions, each having a maximum height, and the maximum height of the middle portion is greater than the maximum height of the lateral end portions.

24. An intervertebral fusion device comprising:

a) an anterior wall having a horizontal cross section having a convex shape and a recessed portion,

b) a posterior wall,

c) first and second end walls between the anterior and posterior walls,

d) an upper bearing surface between the anterior and posterior walls having at least one upper opening therethrough adapted to promote bony fusion, wherein the at least one upper opening comprises between 30 areal % and 60 areal % of the upper surface, and

e) a lower bearing surface between the anterior and posterior walls having at least one lower opening therethrough adapted to promote bony fusion,

wherein the anterior wall has a convex shape and the posterior wall has a concave shape to define a banana shape adapted for non-linear insertion from a posterior side of a spine, and

wherein the upper and lower bearing surfaces each have a midline having a recessed ridge running in the anterior-posterior direction and bisecting a right and left side of the device.

25. The device of claim 24 wherein a posterior portion of each bearing surface is adapted to bear against an anterior one-third of a disc space.

26. The device of claim 24 being an integral unit.

27. The device of claim 24 wherein the posterior wall has a concave horizontal cross section.

28. The device of claim 24 adapted for non-linear insertion from a posterior side of a spine.

29. The device of claim 24 wherein the anterior wall has a maximum height, the posterior wall has a maximum height, and wherein the maximum height of the anterior wall is greater than the maximum height of the posterior wall.

30. The device of claim 24 wherein the first end wall is a leading end wall adapted for insertion into a disc space, and the leading end wall is tapered.

31. The device of claim 24 wherein the anterior wall has a middle portion, lateral end portions, each having a maximum height, and the maximum height of the middle portion is greater than the maximum height of the lateral end portions.

32. An intervertebral fusion device comprising:

a) an anterior wall having a convex shape, and a maximum height,

b) a posterior wall having a concave shape,

c) first and second end walls connecting the anterior and posterior walls

d) an upper bearing surface between the anterior and posterior walls and having a middle portion having a recess, lateral end portions, and at least one upper opening therethrough adapted to promote bony fusion, wherein the at least one upper opening comprises between 30 areal % and 60 areal % of the upper surface, and

e) a lower bearing surface having an anterior portion below the anterior wall, a posterior portion below the posterior wall, and at least one lower opening therethrough adapted to promote bony fusion,

wherein the anterior wall has a convex shape and the posterior wall has a concave shape to define a banana shape adapted for non-linear insertion from a posterior side of a spine, and

wherein the upper and lower bearing surfaces each have a midline having a recessed ridge running in the anterior-posterior direction and bisecting a right and left side of the device.

33. The device of claim 32 wherein a posterior portion of each bearing surface is adapted to bear against an anterior one-third of a disc space.

34. The device of claim 32 being an integral unit.

35. The device of claim 32 wherein the posterior wall has a concave horizontal cross section.

36. The device of claim 32 adapted for non-linear insertion from a posterior side of a spine.

37. The device of claim 32 wherein the anterior wall has a maximum height, the posterior wall has a maximum height, and wherein the maximum height of the anterior wall is greater than the maximum height of the posterior wall.

38. The device of claim 32 wherein the first end wall is a leading end wall adapted for insertion into a disc space, and the leading end wall is tapered.

39. The device of claim 32 wherein the at least one upper opening comprises between 30 areal % and 60 areal % of the upper surface.

40. The device of claim 32 wherein the anterior wall has a middle portion, lateral end portions, each having a maximum height, and the maximum height of the middle portion is greater than the maximum height of the lateral end portions.