Patent ID: 8753397
Filing Date: 2014-06-17
Classification: A61B,A61F

Abstract:
1. An intervertebral disc prosthesis configured and arranged for placement between an upper spinal vertebra and a lower spinal vertebra, the prosthesis comprising: an upper plate comprising a lower surface that is generally planar except for an interior portion having a shallow concave curved portion, the concave curved portion of the lower surface of the upper plate having a first area and a curvature, and an upper surface that is generally planar except for an interior portion having a protuberance sized to accommodate the shallow concave curved portion of the lower surface; a lower plate comprising a generally planar upper surface having a second area, a first lateral plate edge and a second lateral plate edge disposed on opposite lateral sides of the lower plate, a first wall protruding from the upper surface of the lower plate along the first lateral side, and a second wall protruding from the upper surface of the lower plate along the second lateral side; and a core configured and arranged for placement between the upper plate and the lower plate, the core comprising an upper surface comprising a convex curved portion having a curvature complimentary to the curvature of the concave curved portion of the lower surface of the upper plate, the convex curved portion of the upper surface of the core having an area that is larger than the first area, a generally planar lower surface having an area that is smaller than the second area, a first lateral core edge and a second lateral core edge disposed on opposite lateral sides of the core between the upper surface of the core and the lower surface of the core, a first lateral recess disposed along the first lateral core edge and configured and arranged to receive at least a portion of the first wall and having a first size sufficient for movement of the portion of the first wall within the first lateral recess, a second lateral recess disposed along the second lateral core edge and configured and arranged to receive at least a portion of the second wall and having a second size sufficient for movement of the portion of the second wall within the second lateral recess, and the first size and the second size defining a range of motion for the core that limits translational movement of the core along the generally planar upper surface of the lower plate and rotational movement of the core about an axis perpendicular to the generally planar upper surface of the lower plate.