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1. WO2004093732 - PROTHESES DE SUPPORT MOBILES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:
1. A prosthesis, comprising:
a first component adapted to carry an articulating surface of a joint;
a second component, spaced from the articulating surface by the first component, configured and dimensioned to be fixed with respect to a bone of the joint; and
controlled restraint means acting between said first and second components.

2. The prosthesis of claim 1, wherein said controlled restraint means comprises magnetic elements disposed in each of said first and second components, wherein said elements cooperate to control motion between said first and second components.

3. The prosthesis of claim 2, wherein said components contact each other on contact surfaces, the first component contact surface being disposed opposite a joint articular surface and the second component contact surface being disposed opposite a bone fixation point of the prosthesis.

4. The prosthesis of claims 2-3, wherein said magnetic elements comprise a hard magnetic material disposed in one said component and at least one of another a hard magnetic material or a soft magnetic material disposed in the other component.

5. The prosthesis of claims 1-4, wherein said second component is configured to couple between said first component and a bone attachment component that is fixed to a bone of the joint.

6. The prosthesis of claims 1-5, wherein said first and said second components are made from a bio compatible material.

7. The prosthesis of claims 1-6, further comprising at least one physical stop configured and dimensioned on said second component near its perimeter, wherein said at least one physical stop protrudes toward said adjacent first component such that planar translation and rotation of said first component with respect to said second component is predictably constrained.

8. The prosthesis of claim 7, wherein said physical stop is configured and dimensioned with a substantially planar contact surface.

9. The prosthesis of claims 7-8, wherein said physical stop comprises a substantially elliptical protrusion from one of said components with a long axis of at least 10 millimeters but encompassing not more than 80 percent of a surface area of the second component and wherein there is about a 3 millimeter gap between said substantially elliptical protrusion and said other component such that each of said components can move with respect to each other.

10. The prosthesis of claims 7-9, wherein said physical stop is disposed with magnetic elements configured and dimensioned to interact with corresponding opposing magnetic stop elements configured and dimensioned and disposed within said first component.

11. The prosthesis of claims 1-6, further comprising at least one stop wherein said stop is a magnetic field emanating from at least one magnetic element
subsurfacely disposed within one said component and opposing a magnetic field emanating from at least one magnetic element subsurfacely disposed within the other component.

12. The prosthesis of claims 2-11, wherein said magnetic elements are encased within said first and said second components such that said magnetic elements are maintained separate from contact with body fluids and components.

13. The prosthesis of claims 2-12, wherein said magnetic elements comprise substantially disc like magnets disposed substantially near a center of the components and substantially aligned with one another.

14. The prosthesis of claims 2-12, wherein said magnetic elements comprise at least one series of progressively larger zones of magnetic elements disposed within one said component and a simple substantially solid shaped magnet disposed within the other said component.

15. The prosthesis of claims 1-12, wherein:
said first component contains a substantially solid shaped magnetic element positioned substantially within a center of said first component; and
said second component contains a substantially centered magnetic element and a plurality of substantially peripherally positioned magnetic elements configured and dimensioned such that as the first component moves toward a periphery of the second component, the components are increasingly attracted by an increasing magnetic gradient.

16. The prosthesis of claims 2-12, wherein said magnetic elements comprise a grid of magnetic elements configured with a plurality of oppositely oriented magnetic polar regions.

17. The prosthesis of claims 2-12, wherein said magnetic elements comprise a plurality of linear hard magnetic material configured adjacent each other with alternating polarities.

18. The prosthesis of any one of the above claims, further comprising:
at least one further component configured and dimensioned to be positioned between said first component and said second component;
wherein said at least one further component is disposed with further magnetic elements; and
wherein said further magnetic elements interact cooperatively with said magnetic elements in said first component and said second component to further control motion between all said components.

19. The prosthesis of any one of the above claims, wherein said first component comprises a base member and an insert member disposed on the base member.

20. The prosthesis of claim 19, wherein said insert member is moveable with respect to the base member.

21. The prosthesis of claim 20, further comprising additional magnetic elements disposed in each of said base member and insert member and cooperating to control relative motion between said members.

22. The prosthesis of claims 7-10, wherein said physical stops form a continual perimeter substantially encircling said components.

23. The prosthesis of claims 7-10, wherein said physical stops is a separate component configured and dimensioned to receive a component around its perimeter and provide a physical barrier for the other component.

24. The prosthesis of any of the above claims, wherein said first component is operatively connected to the first bone portion across an articulating joint surface.

25. The prosthesis of claim 16, wherein said grid pattern is formed by a repetitive pattern comprising a repeated base unit, wherein said base unit comprises plural magnets configured and dimensioned with polarities oriented to substantially concentrate magnetic flux of the base unit on one surface thereof.

26. The prosthesis of claim 25 wherein said base unit comprises four magnets coupled together each having an associated magnetic polarity oriented differently from the other magnets in the base unit.

27. The prosthesis of claims 1-3, comprising:
a soft magnetic material disposed with said first component; and a hard magnetic material disposed with said second component, said elements being positioned for magnetic attraction therebetween;
wherein at least one of said hard or soft magnetic materials has a center point and is configured and dimensioned to vary the magnetic attraction as the opposite magnetic material is moved away from the center point.

28. The prosthesis of claim 27, wherein said at least one of said hard or soft magnetic material is configured and dimensioned in an annular shape.

29. The prosthesis of claim 27, wherein said at least one of said hard or soft magnetic material is configured and dimensioned with radiating petals.

30. The prosthesis of claim 27, wherein said at least one of said hard or soft magnetic material is configured and dimensioned with interlaced fingers.

31. The prosthesis of claim 27, wherein said at least one of said hard or soft magnetic material is configured and dimensioned with a varying thickness in a radial direction from the center point.

32. The prosthesis of claims 27-31, wherein said at least one of said hard or soft magnetic material is stepped.

33. The prosthesis of claims 27-32, wherein said at least one of said hard or soft magnetic material is configured and dimensioned to provide a plurality discrete spots of material arranged around the center point.

34. The prosthesis of claim 33, wherein said discrete spots of material vary in size along at least one radial direction with respect to the center point.

35. The prosthesis of claim 27-41, wherein one of said first and second components is operatively connected to a corresponding bone portion across an articulating joint surface.

36. The prosthesis of claim 1, wherein said controlled restraint means comprises:
physical stops configured and dimensioned around said second component near its perimeter, wherein said stops protrude toward said adjacent first component such that planar movement of said first component with respect to said second component is constrained.

37. The prosthesis of claim 36, wherein said physical stops are configured and dimensioned with a substantially planar contact surface such that during contact with said first component mechanical stresses are distributed over said substantially planar contact surface.

38. The prosthesis of claim 36, wherein said physical stops form a continual perimeter substantially encircling said components.

39. The prosthesis of claim 36, wherein said physical stops is a separate component configured and dimensioned to receive a component around its perimeter and provide a physical barrier for the other component.

40. The prosthesis of claim 36, wherein said physical stop is a substantially elliptical protrusion from one said component having a long axis of at least about 10 millimeters but encompassing not more than 80 percent of a surface area of the second component and wherein there is about a 3 millimeter gap between said substantially elliptical protrusion and the other component such that the components can
controllably translate and rotate with respect to each other.

41. The prosthesis of claims 36-40, wherein said physical stops are disposed with magnetic elements configured and dimensioned to interact with corresponding opposing magnetic stop elements configured and dimensioned and disposed within said first component.

42. The prosthesis of claims 36-41, further comprising at least one stop wherein said stop is a magnetic field emanating from a magnetic element subsurfacely disposed substantially within one said component and opposing a magnetic field emanating from magnetic elements substantially embedded within the other said component.