Bone graft device

• US 20040049270A1
• Filed: 09/10/2002
• Published: 03/11/2004
• Est. Priority Date: 09/10/2002
• Status: Abandoned Application

• Current Assignee: Robert J. Gewirtz
• Original Assignee: Robert J. Gewirtz
• Inventors: Gewirtz, Robert J.
• Application Number:
  US10/238,326
• Publication Number:
  US 20040049270A1
• Time in Patent Office: Days
• US Class Current: 623/17.11
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• 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 2002/30113 circular
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/3071 Identification means; Administration of patients
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0015 Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0023 triangular
• CPC Class Codes: A61F 2250/0085 Identification means; Administration of patients

Abstract

A bone graft device adapted to be received in an implant site in a patient, including, for example without limitation, an anterior spinal resection of one or more vertebrae of a spinal column of the patient. The bone graft implant site can be defined as a resection formed in any damaged or injured bone tissue, which can be, for further example, the spinal column resection that is formed between an inferior vertebral surface that confronts a superior vertebral surface where between one or more vertebral bodies and or vertebral discs or portions thereof have been removed to establish the implant site. The bone graft device includes a plurality of pseudo-vertebrae that are each formed with a transverse cross-sectional profile sized for implant in the anterior spinal resection. The pseudo vertebrae can be wedge-shaped and are stacked on at least one stanchion that can be centrally positioned or spaced apart. At least one of the plurality of pseudo-vertebrae defines an exteriorly facing sill that is adapted to be frictionally confronting and received against at least one of the inferior and superior vertebral surfaces to maximize frictional contact between the sill and at least one of the surfaces. Each pseudo-vertebral sill is sized and shaped to be equal to or smaller than the cross-section of the vertebral bodies defining the superior and inferior vertebral body surfaces so as to not invade the vertebral channel of the spinal column when the bone graft device is introduced into and received in the resection.

Claims

1. A bone graft device adapted to be received in an anterior spinal resection of one or more vertebrae of a spinal column, the resection being defined between an inferior vertebral surface confronting a superior vertebral surface, each surface being bounded by a respective periphery defining the extents of the respective area of the surface, comprising:

a plurality of pseudo-vertebrae adapted with a cross-sectional profile compatible for implant in the anterior spinal resection;

at least one stanchion receiving the plurality of pseudo-vertebrae in a generally stacked arrangement;

wherein at least one of the plurality of pseudo-vertebrae defines an exteriorly facing sill configured to be received against at least one of the inferior and superior vertebral surfaces to maximize contact between the surfaces; and

wherein each sill is sized and shaped to be substantially circumscribed by at least one of the respective vertebral surface peripheries when received there against so as to not invade the vertebral channel of the spinal column when the bone graft device is introduced into and received in the resection.

2. The bone graft device according to claim 1, wherein at least one of the plurality of pseudo-vertebrae has a generally elongated cardioid cross-sectional profile proximal to the sill that is substantially circumscribed by the proximate vertebral surface.

3. The bone graft device according to claim 2, wherein the proximal vertebral surface is formed in a cervical vertebral body.

4. The bone graft device according to claim 2, wherein the proximal vertebral surface is formed in a thoracic vertebral body.

5. The bone graft device according to claim 2, wherein the proximal vertebral surface is formed in a lumbar vertebral body.

6. The bone graft device according to claim 1, wherein at least one of the plurality of pseudo-vertebrae is formed to have a substantially wedged shaped cross section about a sagittal plane.

7. The bone graft device according to claim 6, wherein the at least one pseudo-vertebra is adapted to rotate, as the bone graft device is introduced into the resection, about an axis substantially parallel with an axis of the at least one stanchion.

8. The bone graft device according to claim 1, wherein the at least one stanchion is at least partially curved about an axis passing longitudinally therethrough.

9. The bone graft device according to claim 1, wherein the pseudo-vertebrae are received about at least two stanchions.

10. The bone graft device according to claim 1, wherein the at least one stanchion is substantially medially disposed about the plurality of pseudo-vertebrae.

11. The bone graft device according to claim 1, wherein the at least one stanchion is substantially peripherally disposed about the plurality of pseudo-vertebrae.

12. A bone graft device adapted to be received in an anterior spinal resection of one or more vertebrae of a spinal column, the resection being defined between an inferior vertebral surface obliquely confronting a superior vertebral surface, each surface being bounded by a respective periphery defining the extents of the respective area of the surface, comprising:

at least three pseudo-vertebrae each adapted with a cross-sectional profile compatible for implant in the anterior spinal resection and further including (1) abacus and plinth pseudo-vertebra each having a substantially wedged shaped sagittal cross section and respective exteriorly facing sills adapted to maximize contact with the respective superior and inferior vertebral surfaces, and (2) at least one drum pseudo-vertebra stacked between the abacus and plinth pseudo-vertebrae;

at least one stanchion receiving the plurality of pseudo-vertebrae in a generally stacked arrangement;

wherein at least one of the abacus and plinth pseudo-vertebrae are rotatably received about the at least one stanchion; and

wherein each sill is sized and shaped to be substantially circumscribed by at least one of the respective vertebral surface peripheries when received there against so as to not invade the vertebral channel of the spinal column when the bone graft device is received in the resection.

13. The bone graft device according to claim 12, wherein at least one of the plurality of pseudo-vertebrae has a generally elongated cardioid cross-sectional profile proximal to the sill that is substantially circumscribed by the proximate vertebral surface.

14. The bone graft device according to claim 13, wherein the proximal vertebral surface is formed in a cervical vertebral body.

15. The bone graft device according to claim 13, wherein the proximal vertebral surface is formed in a thoracic vertebral body.

16. The bone graft device according to claim 13, wherein the proximal vertebral surface is formed in a lumbar vertebral body.

17. The bone graft device according to claim 12, wherein the at least one stanchion is at least partially curved about an axis passing longitudinally therethrough.

18. The bone graft device according to claim 12, wherein the at least one stanchion is substantially medially disposed about the plurality of pseudo-vertebrae.

19. The bone graft device according to claim 12, wherein the at least one stanchion is substantially peripherally disposed about the plurality of pseudo-vertebrae.

20. The bone graft device according to claim 12, further including at least two drum pseudo-vertebra that are stacked between the abacus and plinth pseudo-vertebrae, and wherein the at least two drum pseudo-vertebrae incorporate at least one key element adapted to prevent relative rotation between the at least two drum pseudo-vertebrae.

21. The bone graft device according to claim 20, wherein the respective at least one key elements cooperate with at least one stanchion key element formed in the at least one stanchion and adapted to prevent relative rotation between the at least one stanchion and the at least two drum pseudo-vertebrae.

22. The bone graft device according to claim 20, wherein the at least one key element is formed in at least one of the drum pseudo-vertebrae and is adapted to engage another of the at two drum pseudo-vertebrae to prevent relative rotation there between.

23. A bone graft kit adapted to assemble a bone graft device to be received in an anterior spinal resection of one or more vertebrae of a spinal column, the resection being defined between an inferior vertebral surface confronting a superior vertebral surface, each surface being bounded by a respective periphery defining the extents of the respective area of the surface, comprising:

a plurality of pseudo-vertebrae adapted with a cross-sectional profile compatible for implant in the anterior spinal resection wherein the pseudo-vertebrae of the plurality include at least one of shim, drum, and wedge pseudo-vertebrae;

at least one stanchion receiving the plurality of pseudo-vertebrae in a generally stacked arrangement, the at least one stanchion including at least one of a cylindrical, a keyed, and a curved stanchion;

wherein at least one of the plurality of pseudo-vertebrae defines an exteriorly facing sill configured to be received against at least one of the inferior and superior vertebral surfaces to maximize contact between the surfaces; and

wherein each sill is sized and shaped to be substantially circumscribed by at least one of the respective vertebral surface peripheries when received there against so as to not invade the vertebral channel of the spinal column when the bone graft device is received in the resection.

24. The bone graft device according to claim 23, wherein at least one of the plurality of pseudo-vertebrae has a generally elongated cardioid cross-sectional profile proximal to the sill that is substantially circumscribed by the proximate vertebral surface.

25. The bone graft device according to claim 23, wherein the shim pseudo-vertebrae is adapted with a longitudinal thickness substantially less than that of drum and wedge pseudo-vertebrae.

26. The bone graft device according to claim 23, wherein the at least one wedge pseudo-vertebra is adapted to rotate about an axis substantially parallel with an axis of the at least one stanchion.

27. The bone graft device according to claim 23, wherein the at least one stanchion is at least partially curved about an axis passing longitudinally therethrough.

28. The bone graft device according to claim 23, wherein at least two drum pseudo-vertebrae are received about at least two stanchions.

29. The bone graft device according to claim 23, wherein the at least one stanchion is substantially medially disposed about the plurality of pseudo-vertebrae.

30. The bone graft device according to claim 23, wherein the at least one stanchion is substantially peripherally disposed about the plurality of pseudo-vertebrae.