Prosthetic Disc For Intervertebral Insertion
AssigneeSpinalMotion, Inc.
InventorsMalan de Villiers, Ulrich Hähnle
Life of this patent
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Abstract
A prosthetic disc for insertion between adjacent vertebrae includes a core having upper and lower curved surfaces, upper and lower plates, and peripheral restraining structure on at least one of the upper plate, the lower plate and the core. Each plate has an outer surface which engages a vertebra and an inner curved surface which slides over the curved surface of the core. The peripheral restraining structure serves to hold the core against a curved surface of at least one of the plates during sliding movement of the plates over the core.
Claims23
A prosthetic disc for insertion between adjacent vertebrae, the prosthetic disc comprising:
- upper and lower plates having outer surfaces locatable against the respective vertebrae, and inner surfaces, wherein at least one of the inner surfaces of the upper and lower plates is a curved inner surface;
- a rigid mobile core removably disposed between the inner surfaces of the upper and lower plates, the core arranged to slide and translate with respect to both the upper and lower plates when the prosthetic disc is implanted;
- and
- a rigid peripheral restraining structure on at least one of the plates providing a boundary which prevents the core from extending beyond the peripheral restraining structure.
A prosthetic disc for insertion between adjacent vertebrae, the prosthetic disc comprising:
- upper and lower plates having outer surfaces locatable against the respective vertebrae, and inner surfaces, wherein at least one of the inner surfaces of the upper and lower plates is a curved inner surface;
- a rigid mobile core removably disposed between the inner surfaces of the upper and lower plates, the core arranged to slide and translate with respect to both the upper and lower plates when the prosthetic disc is implanted;
- a rigid restraining structure on at least one of the plates;
- and
- at least two lips formed on the mobile core, at least one of the lips engaging the restraining structure to hold the core captive between the plates during sliding movement of the plates over the core.
A method for implanting a prosthetic disc between adjacent vertebrae, the method comprising:
- implanting an upper plate against a lower surface of an upper vertebral body;
- implanting a lower plate against an upper surface of a lower vertebral body;
- disposing a rigid mobile core between the upper and lower plates;
- allowing the core to slide and translate with respect to the upper and lower plates when the prosthetic disc is implanted;
- and
- providing a boundary which prevents the core from extending beyond edges of the plates by providing a rigid peripheral restraining structure on at least one of the plates.
Dependencies are inferred from the claim text.