A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/44 (2006.01) A61L 27/16 (2006.01) A61L 27/52 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)
Patent
CA 2094135
A prosthetic nucleus for a vertebral disc is made of a hydrogel material. The hydrogel prosthetic nucleus has a shape gen- erally conforming to the natural nucleus pulposus. The hydrogel has a water content of at least 30 % and has a compressive strength of 4MNm-2 or greater. When the hydrogel material is dehydrated, it has a dimension of less than half of that of the hydrated hydrogel nucleus. The prosthetic nucleus may be formed of two or more pieces of hydrogel material which pieces, when combined, have a shape generally conforming to the natural nucleus. The prosthetic nucleus for implantation in the disc space after removal of a damaged or degenerated nucleus may also be 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 nuc- leus.
Bao Qi-Bin
Higham Paul A.
Howmedica Osteonics Corp.
Smart & Biggar
LandOfFree
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