Method for reducing the generation of wear particulates from an

Details Method for reducing the generation of wear particulates from an Method for reducing the generation of wear particulates from an

1994-07-19

1996-05-14

Bryant, David P.

Metal working

Method of mechanical manufacture

During simulated operation or operating conditions

427 226, B23Q 1700

Patent

active

055155901

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. 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 200-2,500 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.

REFERENCES:
McKellop, et al.; "Friction And Wear Properties Of Polymer, . . . On A Multichannel Screeing Device"; J Of Biomedical Materials Research; 15, 619-653; (1981).
Murall Jasty; "Clinical Reviews: 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 Chanllenge"; Orthodpaedic Insight; vol. 1, No. 3; Feb. 1994.
"ARCOM Processed Polyethylene, Uniform Compression Molded: Test Results"; BIOMET, Inc. (1993).

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