Hydrogel intervertebral disc nucleus

Details Hydrogel intervertebral disc nucleus Hydrogel intervertebral disc nucleus

1990-12-21

1991-09-10

Frinks, Ronald

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

Implantable prosthesis

Bone

623 18, 623901, A61F 244

Patent

active

050470558

ABSTRACT:
A prosthetic nucleus for a vertebral disc is made of a hydrogel material. The hydrogel prosthetic nucleus has a shape generally conforming to the natural nucleus pulposus. The hydrogel has a water content of at least 30% and has a compressive strength of 4MNm.sup.-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.

REFERENCES:
patent: 3867728 (1975-02-01), Stubstad et al.
patent: 3875595 (1975-04-01), Froning
patent: 4309777 (1982-01-01), Patil
patent: 4349921 (1982-09-01), Kuntz
patent: 4714469 (1987-12-01), Kenna
patent: 4772287 (1988-09-01), Ray et al.
patent: 4904260 (1990-02-01), Ray et al.
patent: 4911718 (1990-03-01), Lee et al.
patent: 4932969 (1990-06-01), Frey et al.

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