Title:
INTERVERTEBRAL DISK AND NUCLEUS PROSTHESIS
Document Type and Number:
WIPO Patent Application WO2005016172
Kind Code:
A3
Abstract:
A prosthetic implant for replacing a nucleus pulposus of an intervertebral disk includes upper and lower endwalls of discoid cross-section, each having an antero-posterior diameter less than its transverse diameter, and an hourglassÂshaped sidewall connecting the peripheries of the upper endwall and lower endwall to enclose an interior volume filled with a substantially incompressible liquid or soft plastic material. A total prosthesis for replacing the entire human intervertebral disk has an annular core made of a first biocompatible polymer surrounding a central cavity, transitional plates affixed respectively to the upper and lower surfaces of the annular core, the upper and lower transitional plates being made of a second biocompatible material having an elastic modulus greater than that of the first biocompatible polymer, and upper and lower endplates adapted to contact adjacent vertebrae and affixed respectively to the upper and lower transitional plates.
Inventors:
LEE CASEY K (US)
Application Number:
PCT/US2004/015462
Publication Date:
August 18, 2005
Filing Date:
May 17, 2004
Export Citation:
Assignee:
NEXGEN SPINE LLC (US)
LEE CASEY K (US)
LEE CASEY K (US)
International Classes:
A61F2/44; A61F2/00; A61F2/30; (IPC1-7): A61F2/44
Foreign References:
| US6162252A | 2000-12-19 | |||
| US6645248B2 | 2003-11-11 | |||
| US4911718A | 1990-03-27 | |||
| US5071437A | 1991-12-10 | |||
| US3867728A | 1975-02-25 |
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