Spacerless artificial disc replacements

a technology of artificial discs and spacers, applied in the field of artificial disc replacements, can solve problems such as design complexity, and achieve the effect of facilitating more normal spinal flexion, extension, and lateral bending
US20050267582A1Inactive Publication Date: 2005-12-01HOWMEDICA OSTEONICS CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
HOWMEDICA OSTEONICS CORP
Publication Date
2005-12-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

Spacerless artificial disc replacements (ADR) are disclosed. One preferred embodiment includes two saddle-shaped components to facilitate more normal spinal flexion, extension, and lateral bending while limit axial rotation, thereby protecting the facet joints and the annulus fibrosus (AF). Either or both of the superior and inferior components are made of a hard material such as chrome cobalt, titanium, or a ceramic including alumina, zirconia, or calcium phosphate. The articulating surfaces of the ADR are also preferably highly polished to reduce friction between the components. Metals, alloys or other materials with shape-memory characteristics may also prove beneficial.
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Description

REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of the filing date of U.S. Provisional Patent Application No. 60 / 372,520, filed Apr. 12, 2002 and this application is a continuation of U.S. application Ser. No. 10 / 413,028, filed on Apr. 14, 2003, the disclosures of which are incorporated herein by reference.FIELD OF THE INVENTION

[0002] This invention relates generally to artificial disc replacements (ADRs) and, more particularly, to devices that operate without softer spacer materials such as polyethylene. BACKGROUND OF THE INVENTION

[0003] Polyethylene spacers are common in some artificial joint situations, including total knee replacements (TKRs). Polyethylene spacers are also used between metal plates in many artificial disc replacement (ADR) designs.

[0004] Complications arising from poly debris are well documented, however, including fracture of the spacer once it becomes too thin, absorptions and migration of poly particles throughout the body, and ...

Claims

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