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1. (WO2009137506) DISPOSITIF DE DISQUE INTERVERTÉBRAL ARTIFICIEL À CONSERVATION DE MOUVEMENT
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Attorney Docket No. 7115/94465

What is claimed is:

1. A weight-bearing implant comprising: a first bearing member; a second bearing member; a body of the first bearing member having an outer bearing surface for being disposed adjacent a first bone to extend laterally therealong; a body of the second bearing member having an outer bearing surface for being disposed adjacent to a second bone to extend laterally therealong; an interface between the first and second bearing members for allowing at least relative translational movement along a predetermined lateral direction therebetween; and a biasing member between the first and second bodies that resiliently opposes the relative translational movement between the first and second bearing members.

2. The implant of claim 1, wherein the biasing member is an elongate flat spring that normally extends generally orthogonal to the predetermined lateral direction to position the bearing members at a predetermined neutral position relative to each other in the lateral direction.

3. The implant of claim 2, further comprising a spring mounting portion of one of the first and second bodies for engaging with the spring; and a channel of the spring mounting portion for receiving the spring and providing engagement surfaces on opposing sides thereof.

4. The implant of claim 1, further comprising a translatable articulation member disposed between the first and second bodies and operably connected to the biasing member such that the translatable articulation member is translatably biased by the biasing member.

Attorney Docket No. 7115/94465

5. The implant of claim 4, wherein the translatable articulation member further comprises an arcuate articulation surface and one of the first and second bodies has a corresponding arcuate articulation surface and the implant further comprises: an articulation interface formed by the arcuate articulation surface of the translatable articulation member and the corresponding arcuate articulation surface of the one body for allowing polyaxial articulation therebetween.

6. The implant of claim 4, further comprising a biasing member mounting portion of the translatable articulation member for receiving at least a portion of the biasing member.

7. The implant of claim 6, wherein the translatable articulation member includes an articulation surface opposite the arcuate articulation surface and the implant further comprises: an inner articulation surface of the at least one body engaged with the biasing member, wherein the opposite articulation surface of the translatable articulation member and the inner articulation surface form the interface between the first and second bearing members.

8. A weight-bearing implant comprising: a first bearing member; a body of the first bearing member having an outer bearing surface; a second bearing member; a body of the second bearing member having an outer bearing surface; a translatable member disposed between the first and second bearing members having a predetermined position with respect thereto; a resilient connection between the translatable member and at least one of the first and second bearing members to allow the translatable member to translate with respect to the one bearing member; and bearing surfaces of the translatable member and the other bearing member Attorney Docket No. 7115/94465

that engage one another and allow for relative motion therebetween with the resilient connection permitting the bearing surfaces to shift relative to the one bearing member to allow the relative motion between the other bearing member and the translatable member to occur at different positions relative to the one bearing member.

9. The weight-bearing implant of claim 8, wherein the bearing surfaces of the translatable member and the other bearing member comprise dome-shaped surfaces, and the implant further comprises: an arcuate interface formed by the bearing surfaces of the translatable member and the other bearing member to allow the translatable member and the other bearing member to undergo polyaxial articulation with respect to one another and together with the resilient connection permit the polyaxial articulation to occur at different positions relative to the one bearing member.

10. The weight-bearing implant of claim 8, wherein the resilient connection comprises a biasing member operably connected to the translatable member to resist translation of the translatable member with respect to the one bearing member and to bias the translatable member towards the predetermined position thereof.

11. The weight-bearing implant of claim 10, wherein the translatable member comprises a recess portion with the biasing member disposed at least partially therein and operably connected to the second bearing member to provide the resilient connection between the translatable member and the second bearing member.

12. The weight-bearing implant of claim 9, further comprising: an opposite bearing surface of the translatable member opposite the dome-shaped bearing surface; an inner facing bearing surface of the at least one bearing member; and Attorney Docket No. 7115/94465

a sliding interface formed by the opposite bearing surface of the translatable member and the inner facing articulation surface that allows the translatable member to translate laterally with respect to the at least one bearing member.

13. The weight-bearing implant of claim 10, wherein the resilient connection allows the translatable member to translate along a predetermined first direction and the biasing member is a flat spring having a longitudinal axis disposed generally orthogonal to the first direction.

14. The weight-bearing implant of claim 13, wherein the one bearing member comprises a spring-receiving portion including a channel for receiving the spring therein and offering support to opposing sides thereof.

15. An intervertebral implant for being inserted between adjacent upper and lower vertebrae, the intervertebral implant comprising: an upperbody; a lower body; an articulation interface between the upper and lower bodies; a concave articulating surface of the articulation interface having first and second radii of curvature in at least one plane, wherein the first radius of curvature is smaller than the second and neither of the first and second radii of curvatures are infinite; and a convex articulating surface of the articulation interface having a radius of curvature corresponding substantially with the first radius of curvature in the at least one plane, such that the articulation interface provides for polyaxial pivoting as well as translation of the upper and lower bodies with respect to each other.

16. The intervertebral implant of claim 15, wherein the concave articulating surface is disposed on the upper body.

Attorney Docket No. 7115/94465

17. The intervertebral implant of claim 16, wherein the convex articulating surface is disposed on the lower body.

18. The intervertebral implant of claim 15, wherein the at least one plane is a sagittal plane, such that the upper and lower bodies may translate with respect to each other in an anterior-posterior direction to provide for natural movement of the upper and lower vertebrae in flexion and extension.

19. The intervertebral implant of claim 18, wherein a posterior portion of the concave articulation surface comprises the first radius and an anterior portion of the concave articulation surface comprises the second radius to allow the upper and lower bodies to translate with respect to one another with the adjacent vertebrae in extension.

20. The intervertebral implant of claim 19, wherein the first and second radii intersect one another, such that concave articulation surface includes a line interface wherein the radius of curvature of the concave articulation surface changes between the first and second radii of curvature.

21. The intervertebral implant of claim 17, wherein the line interface is located generally at a midpoint of the articulation interface.

22. The intervertebral implant of claim 15, wherein the concave and convex articulation surfaces have the first radius of curvature in a coronal plane.

23. The intervertebral implant of claim 15, wherein the articulating surfaces have a neutral orientation with the convex articulation surface in contact with a portion of the concave articulating surface having the first radius of curvature in the one plane for providing a compact configuration of the implant which operates to self-center the articulation surfaces.