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US5976186: Hydrogel intervertebral disc nucleus

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Filing Information

Inventor(s) Qi-Bin Bao · Paul A. Higham ·
Assignee(s) Stryker Technologies Corporation ·
Attorney/Agent(s) Lerner, David, Littenberg, Krumholz & Mentlik, LLP ·
Primary Examiner Paul B. Prebilic ·
Application Number US8670140
Filing date 06/25/1996
Issue date 11/02/1999
Predicted expiration date 09/08/2014
U.S. Classifications 623/17  · 623/16  ·
International Classifications A61F 244  ·
Kind CodeA
International Classifications 62316;17;18;20;21 ·
Related U.S. Application DataThis is a continuation of application Ser. No. 08/303,297, filed on Sep. 8, 1994, now abandoned.
19 Claims, No Drawings


Abstract

An article for use in the preparation of a hydrogel prosthetic nucleus, for an intervertebral disc, having equilibrium water contents (EWCs) of from about 30 to about 90% and compressive strengths of at least 4 meganewtons per square meter (MNm.sup.-2), at their EWCs, when subjected to the same constraints as the normal nucleus, comprising one or more xerogel rods containing from zero to less than the EWC. A method for preparing a hydrogel prosthetic nucleus, for a vertebral disc, comprising one or more hydrogel rods containing from about 30 to about 90% water, and having compressive strengths of at least 1 MNm.sup.-2, at their EWCs, which comprises inserting one or more hydrophilic xerogel rods, which at their EWC will contain from about 30 to about 90% water and have compressive strengths of at least 1 MNm.sup.-2, containing water in an amount from about zero to less than their EWC, into the cavity of the disc through an opening in its annulus and allowing the rod, or rods, to absorb sufficient water from the body fluids to attain their EWCs and essentially fill the intervertebral nuclear disc cavity.

Independent Claims | See all claims (19)

  1. 1. A prosthetic nucleus implant comprising before implantation at least one elongate, partially hydrated hydrogel member having a cross-sectional diameter of between about 2 mm and about 10 mm, the member sized and configured (a) to fold upon itself a plurality of times within a nucleus cavity upon insertion therein to only partially fill the cavity, and (b) subsequently upon an increase in hydration to essentially fill and conform to the shape of the cavity.
  2. 19.19. A prosthetic nucleus implant means for filling an intervertebral disc nucleus cavity, the means consisting of an elongate, partially hydrated hydrogel member for (a) folding upon itself a plurality of times into said cavity upon insertion therein to only partially fill the cavity, and (b) subsequently upon an increase in hydration to essentially fill and conform to the shape of the cavity.

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