| 摘要 |
An intervertebral disc nucleus replacement implant for positioning between adjacent vertebrae of a spinal segment comprises opposing superior and inferior end portions substantially aligned along a longitudinal axis and a compressible, elastic body surrounding part of the end portions. Each of the end portions includes a convex outer surface for contacting respective endplates of the adjacent vertebrae. Additionally, the elastic body includes an outer surface, with the implant having an outer periphery comprising the outer surfaces of the end portions and the outer surface of the body. In certain embodiments, the elastic modulus of the body is lower than the elastic modulus of each of the end portions and the body extends outward of the end portions transverse to the longitudinal axis, such that the body is configured to limit the amount of subsidence of the implant relative to the adjacent vertebrae.
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