Intervertebral implant for transforaminal posterior lumbar interbody fusion procedure

• US 8,435,300 B2
• Filed: 03/07/2011
• Issued: 05/07/2013
• Est. Priority Date: 05/03/2001
• Status: Expired due to Term

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Inventors: Messerli, Dominique, Gerber, David, Paul, David, Kobayashi, Kenneth Isamu
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): HARVEY, JULIANNA NANCY
• Application Number:
  US13/042,097
• Publication Number:
  US 20110160864A1
• Time in Patent Office: 792 Days
• Field of Search: 623 1711- 1716
• US Class Current: 623/17.16
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/446 having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
• 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 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30383 made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• 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 2002/30599 stackable
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30797 : internally-threaded
• CPC Class Codes: A61F 2002/30843 : Pyramidally-shaped
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/30975 : made of two halves
• 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 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00359 : Bone or bony tissue

Abstract

An intervertebral implant for fusing vertebrae is disclosed. The implant may have a body with curved, posterior and anterior faces separated by two narrow implant ends, superior and inferior faces having a plurality of undulating surfaces for contacting vertebral endplates, and at least one depression in the anterior or posterior face for engagement by an insertion tool. The implant may also have one or more vertical through-channels extending through the implant from the superior face to the inferior face, a chamfer on the superior and inferior surfaces at one of the narrow implant ends, and/or a beveled edge along a perimeter of the superior and inferior faces. The implant configuration facilitates transforaminal insertion of the implant into a symmetric position about the midline of the spine so that a single implant provides balanced support to the spinal column. The implant may be formed of a plurality of interconnecting bodies assembled to form a single unit. An implantation kit and method are also disclosed.

Claims

1. An intervertebral implant comprising:

a three-dimensional body comprising;

a posterior face and anterior face, wherein the posterior face and anterior face are each curved and substantially parallel to each other, and extend along a longitudinal axis of the implant body, the distance between the posterior face and the anterior face defining a width of the body;

a first end portion and a second end portion separating the curved posterior and anterior faces, the distance between the two end portions defining a length of the body, at least the first end portion is at least partially curved;

a superior face and an inferior face for contacting at least a portion of a first and a second vertebra, the distance between the superior and inferior faces defining a thickness of the implant; and

at least two non-threaded recessed portions configured and adapted for engagement by an implant insertion tool, at least one of the recessed portions disposed along at least a portion of the posterior face, at least one of the recessed portions disposed along at least a portion of the anterior face,

wherein the implant is formed of two or more bone pieces fastened together with pins or screws, to form a single unit,

wherein at least one of the superior and inferior faces include a plurality of undulations thereon to resist migration when implanted between two vertebrae,

wherein the length of the body is greater than the width of the body, and

wherein the at least partially curved first end portion includes at least a partially chamfered edge with at least one of the superior and inferior faces to facilitate insertion of the implant in between the two vertebrae.

2. The intervertebral implant of claim 1, wherein the plurality of undulations are selected from at least one of the group consisting of teeth, grooves, ridges, spikes, waves, channels, and grids.

3. The intervertebral implant of claim 1, wherein the thickness of the implant between the superior and inferior faces is greatest at a mid-section between the pair of end portions, and the thickness tapers toward the end portions.

4. The intervertebral implant of claim 1, wherein the implant is formed at least partially from cortical bone.

5. The intervertebral implant of claim 1, wherein at least one end portion includes a plurality of undulations thereon.

6. The intervertebral implant of claim 5, wherein the plurality of undulations are selected from a group consisting of teeth, grooves, ridges, spikes, waves, channels, and grids.

7. The intervertebral implant of claim 1, wherein the partially chamfered edge has a smooth surface without any undulations on at least one of the superior and inferior faces.

8. The intervertebral implant of claim 1, wherein the implant body is substantially kidney bean shaped.

9. The intervertebral implant of claim 1, wherein both of the superior and inferior faces are arcuate shaped.

10. The intervertebral implant of claim 1, wherein the implant body is substantially solid and formed of allogenic bone.

11. The intervertebral implant of claim 1, wherein both end portions are at least partially curved.

12. The intervertebral implant of claim 1, wherein the implant includes a vertical through channel extending through the implant from the superior face to the inferior face.

13. The intervertebral implant of claim 1, wherein the implant further includes at least one horizontal channel extending into at least one of the anterior face and the posterior face.

14. The intervertebral implant of claim 13, wherein the at least one horizontal channel extends through the implant from the anterior face to the posterior face.

15. The intervertebral implant of claim 1, wherein the non-threaded recessed portions are disposed along the posterior and anterior faces toward the second end portion.

16. An intervertebral implant for insertion between two vertebrae comprising:

a three-dimensional body formed at least partially of cortical bone comprising;

a posterior face and an anterior face, wherein the posterior face and anterior face are each curved for substantially their entire length and substantially parallel to each other, and extend along a longitudinal axis of the implant body, the distance between the posterior and anterior faces defining a width of the body;

a first end portion and a second end portion separating the curved posterior and anterior faces, the distance between the two end portions defining a length of the body, at least the first end portion is at least partially curved and forms a leading end portion;

a superior face and an inferior face for contacting at least a portion of a first and a second vertebra, the distance between the superior and inferior faces defining a thickness of the implant; and

at least two non-threaded recessed portions configured and adapted for engagement by an implant insertion tool, at least one of the recessed portions disposed along at least a portion of the posterior face, at least one of the recessed portions disposed along at least a portion of the anterior face,

wherein the implant is formed of two or more bone pieces fastened together with pins or screws, to form a single unit,

wherein the superior and inferior faces include a plurality of undulations thereon to resist migration when implanted between two vertebrae,

wherein the length of the body is at least one and a half times larger than the width of the body,

wherein the at least partially curved first end portion includes at least a partially chamfered edge with each one of the superior and inferior faces to facilitate insertion of the implant in between the two vertebrae, and the superior and inferior faces of the chamfered edge portion are substantially smooth and free of undulations, and

wherein the non-threaded recessed portions are disposed along the posterior and anterior faces toward the second end portion.

17. The intervertebral implant of claim 16, wherein the implant is substantially solid and formed entirely of bone.

18. The intervertebral implant of claim 17, wherein the plurality of undulations are selected from at least one of the group consisting of teeth, grooves, ridges, spikes, waves, channels, and grids.

19. The intervertebral implant of claim 18, wherein both of the superior and inferior faces are arcuate shaped.

20. The intervertebral implant of claim 16, wherein the thickness of the implant is smaller at the at least partially curved end portion.

21. The intervertebral implant of claim 16, wherein the two end portions are curved for substantially their entire length.

22. The intervertebral implant of claim 16, wherein the implant includes a vertical through channel extending through the implant from the superior face to the inferior face.

23. An intervertebral implant comprising:

a three-dimensional body formed at least partially of bone and having a substantially kidney bean shape, the body further comprising;

a posterior face and an anterior face, wherein the posterior face and anterior face are each curved for substantially their entire length and substantially parallel to each other, and extend along a longitudinal axis of the implant body, the distance between the posterior face and the anterior face defining a width of the body;

two curved end portions separating the curved posterior and anterior faces, the distance between the two end portions defining a length of the body, the two end portions being at least partially curved;

a superior face and an inferior face for contacting at least a portion of a first and a second vertebra, the distance between the superior and inferior faces defining a thickness of the implant; and

at least two non-threaded recessed portions configured and adapted for engagement by an implant insertion tool, at least one of the recessed portions disposed along at least a portion of the posterior face, at least one of the recessed portions disposed along at least a portion of the anterior face,

wherein the implant is formed of two or more bone pieces fastened together with pins or screws, to form a single unit,

wherein the superior and inferior faces include a plurality of undulations thereon to resist migration when implanted between two vertebrae,

wherein at least one of the curved end portions includes at least a partially chamfered edge with each one of the superior and inferior faces to facilitate insertion of the implant in between the two vertebrae, the superior and inferior faces of the chamfered edge portion being substantially smooth and free of undulations and the thickness of the implant being smaller at the chamfered end portion than at the midsection of the implant;

wherein the non-threaded recessed portions are disposed along the posterior and anterior faces toward the second end portion, and

wherein the length of the body is at least twice as large as the width of the body.

24. The intervertebral implant of claim 23, wherein the implant includes a vertical through channel extending through the implant from the superior face to the inferior face.