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US 7,731,753 B2Granted
Prosthetic intervertebral discs
AssigneeSpinal Kinetics, Inc.
InventorsMichael L. Reo, Darin C. Gittings
Life of this patent
Estimating the term…
Abstract
Prosthetic intervertebral discs, systems including such prosthetic intervertebral discs, and methods for using the same are described. The subject prosthetic discs include upper and lower endplates separated by a compressible core member. The subject prosthetic discs exhibit stiffness in the vertical direction, torsional stiffness, bending stiffness in the saggital plane, and bending stiffness in the front plane, where the degree of these features can be controlled independently by adjusting the components, construction, and other features of the discs.
Claims77
A prosthetic intervertebral disc comprising:
- a first endplate including at least one fixation member selectively moveable from an undeployed state to a deployed state, the at least fixation member comprising at least one keel slidably engageable from an edge of the first endplate;
- a second endplate attached either directly or indirectly to the first endplate in a substantially parallel relationship thereto;
- and
- a core member positioned between the first and second endplates, and
- wherein the at least one fixation member extends into an intervertebral surface when in the deployed state.
2 more elements
A prosthetic intervertebral disc comprising:
- a first endplate comprising an inner member and an outer member, with the inner member and the outer member being rotatable relative to one another, the rotation being in a substantially parallel relationship to the first endplate;
- a second endplate attached either directly or indirectly to the first endplate;
- and
- a core member positioned between the first and second endplates;
- wherein rotation of the inner member relative to the outer member causes at least one fixation member to extend outward from the first endplate.
2 more elements
A prosthetic intervertebral disc comprising:
- a first endplate with an outer surface having an outer surface area for engaging a first vertebra;
- a second endplate attached either directly or indirectly to the first endplate in a substantially parallel relationship thereto and having an outer surface with an outer surface area for engaging a second vertebra;
- and
- a core member positioned between the first and second endplates;
- wherein said first endplate includes a central portion and a first dropleaf side portion, the first dropleaf side portion having a first position in which it lies in a substantially different plane than the central portion, and a second position in which it lies in a substantially the same plane as the central portion and increases the outer surface area of the first endplate for engaging the first vertebra.
2 more elements
A prosthetic intervertebral disc comprising:
- a first endplate having at least one fixation member moveable from an undeployed state to a deployed state relative to the first endplate, the at least one fixation member being engageable with and extending into a vertebral surface when deployed;
- a second endplate attached either directly or indirectly to the first endplate;
- and
- a compressible core member positioned between the first and second endplates.
1 more element
A prosthetic intervertebral disc comprising:
- a first endplate comprising an inner member and an outer member, the inner member and the outer member being rotatable relative to one another;
- a second endplate attached either directly or indirectly to the first endplate;
- and
- a compressible core member positioned between the first and second endplates;
- wherein rotation of the inner member relative to the outer member causes at least one fixation member to extend outward from the first endplate.
2 more elements
A prosthetic intervertebral disc comprising:
- a first endplate having an outer surface with an outer surface area for engaging a first vertebra;
- a second endplate attached either directly or indirectly to the first endplate and having an outer surface with an outer surface area for engaging a second vertebra;
- and
- a core member positioned between the first and second endplates;
- wherein the first endplate includes a central portion and a first dropleaf side portion, the first dropleaf side portion having a first position relative to the central portion, and a different second position relative to the central portion, in which second position, the first dropleaf side portion increases the outer surface area of the first endplate for engaging a first vertebra.
2 more elements
A prosthetic intervertebral disc assembly comprising:
- a first endplate;
- a second endplate attached either directly or indirectly to said first endplate;
- at least one compressible core member positioned between said first and second endplates;
- at least one fixation member extending outwardly from at least one of the first and second end plates, wherein the end plates are selected from the group consisting of:
- pairs of end plates latchable to each other;
- end plates adapted for use with an installation guidewire;
- upper and lower end plates including, respectively, one or more downwardly extending extensions and one or more upwardly extending extensions acting as facet replacements;
- and multiple pairs of endplates suitable for use together in an interspinous space as adjacent multiple prosthetic discs.
5 more elements
Dependencies are inferred from the claim text.