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US 6,793,678 B2Granted
Prosthetic intervertebral motion disc having dampening
AssigneeDepuy Acromed, Inc.
InventorJohn Riley Hawkins
Life of this patent
Estimating the term…
Abstract
An articulating motion disc having a core member that expands laterally in response to an axial load to mimic the shock absorbing function of a natural intervertebral disc.
Claims18
An intervertebral motion disc comprising:
- a) a first prosthetic vertebral endplate comprising:
- i) an outer surface adapted to mate with a first vertebral body,
- ii) an inner surface having a first articulation surface,
- iii) a body portion connecting the inner and outer surfaces,
- b) a second prosthetic vertebral endplate comprising:
- i) an outer surface adapted to mate with a second vertebral body, and
- ii) an inner surface comprising a first articulation surface, and
- iii) a body portion connecting the inner and outer surfaces, and
- c) a laterally expandable core member comprising:
- a first articulation surface adapted for articulation with the first articulation surface of the first endplate,
- a second articulation surface adapted for articulation with the first articulation surface of the second endplate,
- wherein the core member is oriented therein to produce a first articulation interface between the first articulation surface of the first endplate and the first articulation surface of the core member, and a second articulation interface between the first articulation surface of the second endplate and the second articulation surface of the core member, and a height H between the outer surfaces of the prosthetic endplates, and
- wherein the laterally expandable core member expands laterally when the disc is subjected to axial load of about 750 pounds force (3.4 kN) to reduce the height of the device between 0.5 and 2.0 mm;
- and
- wherein the core member comprises:
- i) an annulus having an inner diameter, and
- ii) an inner articulation member comprising a plurality of articulation components, each articulation component comprising:
- an outer radius adapted to sear upon the inner diameter of the expandable annulus,
- a first articulation surface adapted for articulation with the first articulation surface of the first endplate,
- a second articulation surface adapted for articulation with the first articulation surface of the second endplate.
17 more elements
An intervertebral motion disc comprising:
- a) a first prosthetic vertebral endplate comprising:
- i) an outer surface adapted to mate with a first vertebral body,
- ii) an inner surface having a first articulation surface,
- iii) a body portion connecting the inner and outer surfaces,
- b) a second prosthetic vertebral endplate comprising:
- i) an outer surface adapted to mate with a second vertebral body, and
- ii) an inner surface comprising a first articulation surface, and
- iii) a body portion connecting the inner and outer surfaces, and
- c) a laterally expandable core member comprising:
- i) an annulus having an inner diameter, and
- ii) an inner articulation member comprising a plurality of articulation components, each articulation component comprising:
- an outer radius adapted to seat upon the inner diameter of the expandable annulus,
- a first articulation surface adapted for articulation with the first articulation surface of the first endplate,
- a second articulation surface adapted for articulation with the first articulation surface of the second endplate,
- wherein the core member is oriented therein to produce a first articulation interface between the first articulation surface of the first endplate and the first articulation surface of the core member, and a second articulation interface between the first articulation surface of the second endplate and the second articulation surface of the core member.
12 more elements
Dependencies are inferred from the claim text.