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US 6,733,532 B1Granted
Intervertebral disc prosthesis with improved mechanical behavior
AssigneeStryker Spine
InventorsFabien Gauchet, Régis Le Couedic
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Abstract
An intervertebral disc prosthesis comprising two plates and a cushion interposed between the plates is contemplated. The cushion includes a compressible body having two ends in contact with the plates. At least one of the ends is freely displaceable relative to the plate in a parallel direction. Thus, the prosthesis imitates and approximates the mechanical properties of a healthy natural intervertebral disc.
Claims23
Intervertebral disc prosthesis comprising:
- two plates having inner faces;
- and
- a cushion interposed between the plates, the cushion comprising an elastic body having ends in contact with the inner faces of the plates, wherein at least one of the ends is freely displaceable relative to the associated plate in a direction parallel to the plate, and wherein, prior to loading, the at least one of the ends has a radius of curvature less than that of the inner face of the associated plate.
Intervertebral disc prosthesis comprising:
- two plates;
- a cushion interposed between the plates, the cushion comprising a compressible body having ends in contact with the plates, wherein at least one of the ends is freely displaceable relative to the associated plate in a direction parallel to the plate;
- a fluid interposed between the plates, the fluid being in contact with the plates;
- and
- a chamber extending about the periphery of the body and enclosing the fluid.
2 more elements
Intervertebral disc prosthesis comprising:
- two plates having inner faces;
- a cushion interposed between the plates;
- and
- a chamber extending about the periphery of the cushion;
- wherein the cushion comprises a compressible body having ends in contact with the inner faces of the plates;
- at least one of the ends is freely displaceable relative to the associated plate in a direction parallel to the plate;
- and
- prior to loading, the at least one of the ends has a radius of curvature less than that of the inner face of the associated contacting plate.
5 more elements
Dependencies are inferred from the claim text.