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US5824093: Prosthetic spinal disc nucleus

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Filing Information

Inventor(s) Charles D. Ray · Eugene A. Dickhudt · Robert L. Assell ·
Assignee(s) RayMedica, Inc. ·
Attorney/Agent(s) Dicke, Billig & Czaga, P.A. ·
Primary Examiner Michael J. Milano ·
Application Number US8870866
Filing date 06/06/1997
Issue date 10/20/1998
Predicted expiration date 10/17/2014
U.S. Classifications 623/17  ·
International Classifications A61F 244  ·
Kind CodeA
International Classifications 62317 ·
Related U.S. Application DataThis is a continuation-in-part of application Ser. No. 08/638,306, filed on Apr. 26, 1996, now U.S. Pat. No. 5,674,295, which is a continuation of application Ser. No. 08/324,142, filed on Oct. 17, 1994, now abandoned.
14 Claims, No Drawings


Abstract

An elongated, capsule shaped prosthetic spinal disc nucleus body for implantation into a human inter vertebral spinal disc, made of a hydrogel core and a constraining jacket surrounding the hydrogel core that permits the hydrogel core to deform and reform. The constraining jacket is configured to allow the hydrogel core to hydrate to a predetermined volume and will deform and reform in a desired fashion in response to various loads placed upon the spinal tract. The prosthetic spinal disc nucleus assists in restoring the natural physiology of the human intervertebral disc. By implanting two prosthetic spinal disc nuclei side-by-side into a damaged disc of a human spine, both height and motion can be maintained.

Independent Claims | See all claims (14)

  1. 1. A prosthetic spinal disc nucleus for implantation into a human disc space having a nucleus region defined by an anulus and adjacent vertebral end plates, the prosthetic spinal disc nucleus comprising:a hydrogel core having an oval-shaped frontal cross-section defining a major axis and a minor axis, wherein the hydrogel core is configured to expand from a dehydrated state to a hydrated state; anda constraining jacket surrounding the hydrogel core, wherein the constraining jacket maintains the hydrogel core in the hydrated state at a major axis diameter in the range of approximately 10-20 millimeters and a minor axis diameter in the range of approximately 5-15 millimeters.
  2. 13. A prosthetic spinal disc nucleus for implantation into a human disc space having a nucleus region defined by an anulus and adjacent vertebral end plates, the prosthetic spinal disc nucleus comprising:a hydrogel core having an oval-shaped frontal cross-section defining a major axis and a minor axis, wherein the hydrogel core is configured to deform from an unloaded state to a loaded state; anda constraining jacket surrounding the hydrogel core, wherein the constraining jacket maintains the hydrogel core in the loaded state at a minor axis diameter in the range of approximately 3-10 millimeters.
  3. 14.14. An incompressible, elastic, deformable and reformable spinal disc nucleus prosthesis, including a core surrounded by a jacket, implanted within a nucleus cavity having a variable volume defined by an anulus and a pair of spaced vertebral end plates, the prosthesis having a fixed volume following completion of implantation that is less than the volume of the nucleus cavity, a height which decreases with increasing load on the end plates and which increases with decreasing load on the end plates to allow for corresponding variation in volume of the nucleus cavity so that when the volume of the nucleus cavity decreases with increasing load on the end plates, a pressure within the nucleus cavity is increased to force fluid out of the nucleus cavity, and when the volume of the nucleus cavity increases with decreasing load on the end plates, the pressure within the nucleus cavity is decreased to draw fluid into the nucleus cavity.

References Cited

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Other Publications

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.

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