Composite telescoping anterior interbody spinal implant

• US 20100076559A1
• Filed: 05/05/2008
• Published: 03/25/2010
• Est. Priority Date: 05/04/2007
• Status: Abandoned Application

• Current Assignee: Titan Spine, LLC
• Original Assignee: Titan Spine, LLC
• Inventors: Bagga, Charanpreet S., Ullrich, Peter F. JR.
• Application Number:
  US12/151,167
• Publication Number:
  US 20100076559A1
• Time in Patent Office: Days
• US Class Current: 623/17.160
• 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 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 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30601 telescopic
• 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 2002/30892 parallel
• CPC Class Codes: A61F 2002/30925 etched
• CPC Class Codes: A61F 2002/3093 for promoting ingrowth of bone tissue
• 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 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0065 toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

A composite telescoping interbody spinal implant and method of using the implant. The implant includes a cage formed of metal, a metal alloy, or both. The cage is able to change size following manufacture, and has a top plate with a plurality of posts and a bottom plate with a corresponding plurality of columns. The posts telescopically engage the columns upon assembly of the top plate with the bottom plate. The posts extend partially outside the columns when the top plate is in a raised first position with respect to the bottom plate; the posts and columns are fully engaged when the top plate is in a second position closest to the bottom plate. The implant also includes a non-metallic body inserted between the top plate and the bottom plate and defining the adjustable height of the implant.

Claims

1. A composite telescoping interbody spinal implant comprising:

a cage formed of metal, a metal alloy, or both, able to change size following manufacture, and having a top plate with a plurality of posts and a bottom plate with a corresponding plurality of columns, the posts telescopically engaging the columns upon assembly of the top plate with the bottom plate, wherein the posts extend partially outside the columns when the top plate is in a raised first position with respect to the bottom plate and the posts and columns are fully engaged when the top plate is in a second position closest to the bottom plate; and

a non-metallic body inserted between the top plate and the bottom plate and defining the adjustable height of the implant.

2. The implant according to claim 1 wherein the posts are integral with the top plate and the columns are integral with the bottom plate.

3. The implant according to claim 1 wherein, when assembled, the implant defines a vertical aperture that extends the entire height of the implant.

4. The implant according to claim 3 further comprising bone graft material disposed in an area defined by the cage including the aperture.

5. The implant according to claim 4 wherein the bone graft material is selected from cancellous autograft bone, allograft bone, demineralized bone matrix (DBM), porous synthetic bone graft substitute, bone morphogenic protein (BMP), or combinations of those materials.

6. The implant according to claim 1 wherein the columns are shaped and adapted to accommodate the impact of an instrument during placement of the implant.

7. The implant according to claim 1 wherein the cage and the body are sized, shaped, and adapted to maximize contact by the implant with the apophyseal rim of the vertebral endplates.

8. The implant according to claim 1 wherein the body has a hole facilitating manipulation of the implant.

9. The implant according to claim 1 wherein the top plate has a top surface with a roughened topography, a bottom surface which faces the bottom plate, opposing lateral sides rounded to ease placement of the implant, and opposing anterior and posterior portions with the anterior portion including a sharp edge and the posterior portion rounded to ease placement of the implant.

10. The implant according to claim 1 wherein the bottom plate has a top surface which faces the top plate, a bottom surface with a roughened topography, opposing lateral sides rounded to ease placement of the implant, and opposing anterior and posterior portions with the anterior portion including a sharp edge and the posterior portion rounded to ease placement of the implant.

11. The implant according to claim 1 wherein the top and bottom plates are each formed from two, separate sections.

12. The implant according to claim 1 further comprising at least one strut formed on the bottom plate, the top plate, or on both the top and bottom plates, the at least one strut enhancing the structural integrity of the implant and facilitating one or more of anterior, antero-lateral, and lateral implantation of the implant.

13. The implant according to claim 12 wherein the at least one strut is integral with the bottom plate, the top plate, or both the top and bottom plates.

14. The implant according to claim 12 wherein the at least one strut is formed on the bottom plate and has a height substantially equal to the height of the columns.

15. The implant according to claim 12 wherein the at least one strut has a hole facilitating manipulation of the implant.

16. A composite telescoping interbody spinal implant comprising:

a cage formed of metal, a metal alloy, or both, able to change size following manufacture, and having a top plate with a plurality of posts and a bottom plate with a corresponding plurality of columns, the posts telescopically engaging the columns upon assembly of the top plate with the bottom plate, wherein the posts extend partially outside the columns when the top plate is in a raised first position with respect to the bottom plate and the posts and columns are fully engaged when the top plate is in a second position closest to the bottom plate, wherein;

(a) the top plate has a top surface with a roughened topography, a bottom surface which faces the bottom plate, opposing lateral sides rounded to ease placement of the implant, and opposing anterior and posterior portions with the anterior portion including a sharp edge and the posterior portion rounded to ease placement of the implant, and

(b) the bottom plate has a top surface which faces the top plate, a bottom surface with a roughened topography, opposing lateral sides rounded to ease placement of the implant, and opposing anterior and posterior portions with the anterior portion including a sharp edge and the posterior portion rounded to ease placement of the implant; and

a non-metallic body inserted between the top plate and the bottom plate and defining the adjustable height of the implant,

wherein the cage and the body are sized, shaped, and adapted to maximize contact by the implant with the apophyseal rim of the vertebral endplates.

17. The implant according to claim 16 wherein the cage is titanium, a titanium alloy, or both.

18. The implant according to claim 16 wherein the body is polyetherether-ketone (PEEK).

19. The implant according to claim 16 wherein the top and bottom plates are each formed from two, separate sections.

20. The implant according to claim 16 further comprising at least one strut formed on the bottom plate, the top plate, or on both the top and bottom plates, the at least one strut enhancing the structural integrity of the implant and facilitating one or more of anterior, antero-lateral, and lateral implantation of the implant.