Hydrogel bead intervertebral disc nucleus

Details Hydrogel bead intervertebral disc nucleus Hydrogel bead intervertebral disc nucleus

1991-09-09

1993-03-09

Frinks, Ronald

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

623 11, 623 16, A61F 244

Patent

active

051923262

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.

REFERENCES:
patent: 3867728 (1975-02-01), Stubstad et al.
patent: 3875595 (1975-04-01), Froning
patent: 4772287 (1988-09-01), Ray et al.
patent: 4904260 (1990-02-01), Ray et al.
patent: 4911718 (1990-03-01), Lee et al.

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