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US 8,801,789 B2Granted
Two-component artificial disc replacements
AssigneeSpineCore, Inc.
InventorBret A. Ferree
Life of this patent
Estimating the term…
Abstract
Artificial disc replacements (ADRs) and total disc replacements (TDRs) are based upon two, directly articulating components, resulting in a restricted-motion system that better approximates more normal spinal flexion, extension, and lateral bending. Both components are preferably made of a hard material and are highly polished to reduce friction.
Claims20
An artificial disc replacement (ADR) having an anterior-to-posterior orientation and a lateral orientation, the ADR comprising:
- first and second components having first and second bone-contacting surfaces adapted to contact first and second adjacent vertebrae, first and second articulating surfaces positioned at an anterior location of the ADR, and first and second stop surfaces positioned at a posterior location of the ADR, wherein the first articulating surface has a concave surface and the second articulating surface has an opposing convex surface;
- and
- wherein, as a result of engagement between the first and second stop surfaces, extension of the first and second vertebrae relative to one another is restricted to relive pressure borne by opposing facets of the first and second vertebrae.
An artificial disc replacement (ADR) comprising:
- first and second components having first and second bone-contacting surfaces adapted to contact first and second adjacent vertebrae, first and second articulating surfaces positioned at a first location offset from a center of the ADR in an anterior direction, and first and second stop surfaces positioned at a second location offset from the center of the ADR in a posterior direction, wherein the first articulating surface has a concave surface and the second articulating surface has an opposing convex surface;
- and
- wherein, as a result of engagement between the first and second stop surfaces, extension of the first and second vertebrae relative to one another is restricted to relive pressure borne by opposing facets of the first and second vertebrae, the articulating surfaces allowing flexion between the first and second vertebrae but restricting extension via the first and second stop surfaces.
Dependencies are inferred from the claim text.