Hydrogel bead intervertebral disc nucleus
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United States of America Patent
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Mar 9, 1993
Issued Date -
N/A
app pub date -
Sep 9, 1991
filing date -
Dec 21, 1990
priority date (Note) -
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Abstract
A prosthetic nucleus for implantation in the disc space after removal of a damaged or degenerated nucleus is formed from a multiplicity of hydrogel beads having a water content of at least 30%. The beads are covered by a semi-permeable membrane. The membrane has porosity less than the size of the beads to thereby retain the beads therein but permit fluids to flow in and out of the prosthetic nucleus.
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