Prosthetic spinal disc nucleus having a shape change characteristic
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United States of America Patent
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Aug 5, 2003
Grant Date -
N/A
app pub date -
Apr 5, 1999
filing date -
Apr 5, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A prosthetic spinal disc nucleus comprising a hydrogel core surrounded by a constraining jacket. The hydrogel core is configured to expand from a dehydrated state to a hydrated state. In the dehydrated state, the hydrogel core has a shape selected to facilitate implantation through an anulus opening. Further, in the hydrated state, the hydrogel core has a shape corresponding generally to a portion of a nucleus cavity, the hydrated shape being different from the dehydrated shape. Upon hydration, the hydrogel core transitions from the dehydrated shape to the hydrated shape.
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