Intervertebral prosthetic disc
AssigneeSimplify Medical Pty Ltd
InventorsMalan de Villiers, Ulrich Hahnle
Life of this patent
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Abstract
A prosthetic disc for insertion between adjacent vertebrae includes upper and lower plates, a core disposed between the plates, and at least one projection extending from at least one of the upper and lower curved surfaces of the core into at least one recess of one of the inner surfaces of the plates. The recess is oversize with respect to the projection to allow sliding movement of the plate over the core while retaining the core between the plates during such sliding movement. The projection(s) may include a rod extending through an axial hole in the core, multiple surface features of the core, or the like.
Claims30
An intervertebral prosthetic disc for insertion between adjacent vertebrae, the disc comprising:
- first and second plates each having inner surfaces and outer surfaces locatable against the respective vertebrae;
- a core located between the inner surfaces of the plates, the core allowing the plates to articulate with respect to one another;
- and
- an elongated flexible tie member engaged with at least one of the first and second plates at a location radially outside of a perimeter of the core, wherein the elongated flexible tie member holds the core captive during movement of the plates in flexion, extension, and translation.
A method of retaining a core in an intervertebral prosthetic disc, the method comprising:
- providing first and second plates each having inner surfaces and outer surfaces locatable against respective vertebrae;
- locating a core between the inner surfaces of the plates;
- allowing the plates to articulate with respect to one another and with respect to the core;
- and
- retaining the core between the plates with an elongated flexible tie member engaged with at least one of the first and second plates at a location radially outside of a perimeter of the core.
Dependencies are inferred from the claim text.