Intersomatic implant

• US 20030109928A1
• Filed: 12/19/2002
• Published: 06/12/2003
• Est. Priority Date: 07/12/2000
• Status: Active Grant

• Current Assignee: Zimmer Spine S.A.S. (Zimvie Incorporated)
• Original Assignee: Spine Next
• Inventors: Pasquet, Denis, Le Couedic, Regis
• Granted Patent: US 6,716,245 B2
• Time in Patent Office: Days
• US Class Current: 623/17.11
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4611 of spinal 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 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30563 having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• 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 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30845 with cutting edges
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• 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 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0034 D-shaped
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

The invention concerns an intersomatic implant adapted to contain at least a bone graft and to be inserted in the intervertebral space along a predetermined direction. It comprises: a first part (10), generally annular in shape, enclosing a recess (11) and having a first upper edge (12) and a first lower edge (14), and a second part (16) elongated along its main axis (A) having a second lower edge (18) and a second upper edge (20), and which links along said predetermined direction two opposite portions in line with said first parts (10) dividing said recess (11) into two housings adapted to contain said bone graft, at least a portion of said second lower and upper edges projecting outside the space defined by said first lower (14) and upper (12) second edges of said first part (10).

Claims

1. An intersomatic implant suitable for containing at least one bone graft and for being inserted in the intervertebral space along a predetermined direction, the implant being characterized in that it comprises:

a first portion (10) of generally annular shape surrounding an aperture (11) and presenting a top first edge (12) and a bottom first edge (14); and

a second portion (16) of elongate shape along its main axis (A) presenting a bottom second edge (18) and a top second edge (20), and interconnecting two facing opposite regions of said first portion (10) along said predetermined direction, thereby dividing said aperture (11) into two housings suitable for containing said bone graft, at least one of said bottom and top second edges projecting from the space defined by said bottom and top first edges (14, 12) of the first portion (10).

2. An intersomatic implant according to claim 1, characterized in that said first portion (10) and said second portion (16) are connected together so as to form a single piece.

3. An intersomatic implant according to claim 1 or claim 2, characterized in that said bottom and top second edges (18, 20) of said second portion (16) are curvilinear in shape with their ends running into said bottom and top first edges (14, 12) respectively of said first portion (10).

4. An intersomatic implant according to any one of claims 1 to 3, characterized in that said first portion (10) is pierced laterally along said main axis (A) of said second portion so as to provide a blind hole (22) extending in said second portion (16), said blind hole (22) being suitable for receiving an insertion tool.

5. An intersomatic implant according to any one of claims 1 to 4, characterized in that said bottom and top edges (12, 14, 18, 20) of said first and second portions present serrations suitable for constituting anchoring points in said vertebrae.

6. An intersomatic implant according to any one of claims 1 to 5, characterized in that said first portion (10) of generally annular shape has at least one axis of symmetry (S).

7. An intersomatic implant according to claim 6, characterized in that said second portion (16) interconnects said two opposite regions of said portion (10) along said axis of symmetry (S).

8. An intersomatic implant according to claim 6, characterized in that said second portion (16) interconnects said two opposite regions of said first portion (10) along a direction that is at an angle lying in the range 0°

to 90°

with said axis of symmetry (S).

9. An intersomatic implant according to any one of claims 6 to 8, characterized in that said first portion (10) is generally substantially semicircular in shape.

10. An intersomatic implant according to any one of claims 1 to 9, characterized in that said first portion (10) and said second portion (16) are molded as a single piece of macromolecular material.

11. An intersomatic implant according to any one of claims 1 to 10, characterized in that said first portion (10) and said second portion (16) are made of polyether ether ketone.

12. An intersomatic implant according to any one of claims 1 to 11, characterized in that said second portion further comprises anchoring means projecting from said top and bottom second edges, respectively.

13. An intersomatic implant according to claim 12, characterized in that said anchoring means are constituted by an anchoring piece having two ends, and in that said second portion has a slot opening out into said bottom and top second edges so that said anchoring piece when inserted in said slot passes through said second portion, the first end projecting from said top second edge and the second end projecting from said bottom second edge of said second portion.

14. An intersomatic implant according to claim 13, characterized in that said anchoring piece is substantially trapezoidal in shape, its two ends being defined by the two non-consecutive and non-parallel sides thereof.

15. An intersomatic implant according to claim 14, characterized in that said anchoring piece presents a midplane, and in that it is inserted in said second portion so that said main axis A of said second portion intersects the two bases of the trapezoid, and its midplane is substantially perpendicular to the midplane of said first portion.

16. An intersomatic implant according to claim 14 or claim 15, characterized in that one of the bases of the trapezoid forms two acute angles with the two non-parallel sides, and in that said anchoring piece is inserted in said second portion so that the insertion direction of said implant extends from the longer base towards the shorter base of the trapezoid.

17. An implant according to any one of claims 13 to 16, characterized in that said anchoring piece is made of titanium alloy.

18. An intersomatic implant press for inserting said anchoring piece in said slot in accordance with any one of claims 13 to 17, the press being characterized in that it comprises:

a first jaw suitable for receiving said first portion in which said second portion interconnects two opposite edges, said first jaw having a central aperture in register with said slot in said second portion; and

a second jaw placed facing said central slot;

and in that said jaws are capable of being moved towards each other in such a manner that said second jaw can bear against said anchoring piece to force it into said slot or to extract it from said slot.