Implant pre-treated for reducing the generation of wear particul

Details Implant pre-treated for reducing the generation of wear particul Implant pre-treated for reducing the generation of wear particul

1997-11-03

1999-03-09

Bryant, David P.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

623 22, 623901, A61F 232

Patent

active

058793887

ABSTRACT:
A method is provided for reducing the amount of wear particulates generated by a total joint orthopaedic implant. The implant consists of two matched articulating components wherein at least one of the components is made of polymer or other material with similar physical properties. The method includes the steps of placing the total joint orthopaedic implant in a fluid bath and articulating the implant in the fluid bath for at least 1,000 cycles. The articulation may be performed in three stages. In the first, the implant is articulated under a load of substantially 0.1-500 Newtons with sliding speeds of substantially 0.01-0.5 meters per second. During a second stage the articulation takes place under a load of substantially 100-2,500 Newtons with sliding speeds of substantially 0.01-0.5 meters per second. In the third stage the articulation takes place under a load of substantially 2,500-10,000 Newtons at sliding speeds of 0.5-2.0 meters per second. The method also includes pre-implantation creeping for the polymer component. This improves the wear resistance of the polymer component, as well as, increases the conformity between the matched articulating components resulting in reduced wear particulate generation.

REFERENCES:
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Murall Jasty; "Clinical Reviewa: Particulate Debris and Failure of Total Hip Replacements"; Journal of Applied Biomaterials; 4, 273-276; (1993).
Dowson, et al.; "Wear Particles: From the Cradle to the Grave"; The Institute of Tribology, Leeds University; Tribology Series, 21; Symposium Sep. 1991.
"The Osteolysis Challenge"; Orthopaedic Insight; vol. 1, No. 3; Feb. 1994.
"Arcom Processed Polyethylene, Uniform Compression Molded: Test Results"; Biomet, Inc. (1993).
Peinkowski, D. et al., ; Low-Voltage Sanning Election Microscope Imaging of Ultrahogh-Molecular-Weight Poly-Ethylene; J. of Bio. Mat. Res. ; VO. 29; 1995; 1167-74.
Pleskachevsky et al.; Oxidation and Its Influence on Low Pressure Polyethylene Wear; Wear; 181-183; 1995; 222-6.

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