Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1996-04-26
1997-10-07
Milano, Michael J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 244
Patent
active
056742959
ABSTRACT:
An elongated, pillow shaped prosthetic spinal disc nucleus body for implantation into a human intervertebral spinal disc, made of a hydrogel core and a flexible constraining jacket surrounding the hydrogel material core that permits the hydrogel core to expand and contract. The hydrogel core has a length approximating the sagittal diameter of a nucleus of the human disc, a width less than the length, and a height less than the length or width. The hydrogel core will expand and contract in a desired fashion as it imbibes and expels fluids in response to various loads placed upon the spinal tract. The constraining jacket is porous to allow fluids to pass through to the hydrogel core, but prevents the hydrogel from escaping, thus fostering the natural physiology of the human intervertebral disc. By implanting two prosthetic spinal disc nucleus bodies side-by-side into a damaged disc of a human spine, both height and motion can be maintained.
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Clinical Efficacy and Outcome in the Diagnosis and Treatment of Low Back Pain, specifically Chapter 21, Charles Dean Ray. The Artificial Disc, Introduction, History and Socioeconomics, 1992, pp. 205-225.
Dickhudt Eugene A.
Frutiger Beth A.
Ledoux Philip J.
Ray Charles D.
Milano Michael J.
RayMedica, Inc.
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