Artificial disc replacements with natural kinematics
OwnerBret A. Ferreeinventor
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Abstract
This invention improves upon prior art TDRs by more closely replicating the kinematics of a natural disc. The preferred embodiments feature two or more fixed centers of rotation (CORs) and an optional variable COR (VCOR) as the ADR translates from a fixed posterior COR to a more anterior COR. The multiple CORs permit a TDR with a posterior COR that lies posterior to the COR of the TDR to facilitate normal disc motion. The use of two or more CORs allow more flexion and more extension than permitted by the facet joints and the AF. Artificial facet joint-like components may also be incorporated into the design to restrict excessive translation, rotation, and/or lateral bending.
Claims30
An artificial disc replacement (ADR) configured for positioning between vertebral bodies having an anterior portion and a posterior portion, comprising:
- a superior component with a lower articulating surface;
- and
- an inferior component with an upper articulating surface that cooperates with the lower surface through one or more centers of rotation (CORs) located in the anterior portion.
An artificial disc replacement (ADR) having two or more centers of rotation (CORs) configured for positioning between vertebral bodies, each having an anterior portion and a posterior portion, the ADR comprising:
- a superior component with a lower articulating surface;
- an inferior component with an upper articulating surface;
- and
- wherein one of the CORs is located between the posterior third and anterior two-thirds of the vertebral bodies.
An artificial disc replacement (ADR) configured for positioning between vertebral bodies having an anterior portion and a posterior portion, comprising:
- a superior component with a lower articulating surface;
- and
- an inferior component with an upper articulating surface that cooperates with the lower surface through two or more fixed or variable centers of rotation (CORs).
An artificial disc replacement (ADR) configured for positioning between vertebral bodies, comprising:
- a superior component with a lower articulating surface;
- and
- an inferior component with an upper articulating surface that cooperates with the lower surface through an anterior-to-posterior-oriented torodial region.
Dependencies are inferred from the claim text.