Method of texturing prosthetic implants
AssigneeDePuy Synthes Products, Inc.
InventorsJason B. Langhorn, Gary R. Fernandes
Life of this patent
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Abstract
A method of treating an articular surface of a metal orthopedic implant includes polishing the surface, blasting the surface with a blast media after the first polishing step and polishing the blasted surface of the metal orthopedic implant after the blasting step. The blasting step roughens the surface to create a surface skew Rsk/Ssk defined by peaks and valleys. The second polishing step reduces the surface skew to a negative skew Rsk/Ssk and produces an average roughness Ra/Sa that is acceptable. Lubrication at the interface of the treated articular surface and the corresponding bearing articular surface is improved, thereby improving wear resistance. Both polishing steps may be performed by drag finishing the surface through an abrasive media.
Claims19
A method of treating an articulation surface of an orthopaedic implant comprising the following steps carried out in order:
- a first step of polishing the articulation surface of the orthopaedic implant;
- a second step of blasting the polished surface of the orthopaedic implant;
- and
- a third step of polishing the blasted surface of the orthopaedic implant;
- wherein:
- the first step of polishing the articulation surface of the orthopaedic implant comprises drag finishing the articulation surface of the orthopaedic implant with an abrasive media for a first period of time;
- the third step of polishing the blasted surface of the orthopaedic implant comprises drag finishing the blasted surface of the orthopaedic implant with an abrasive media for a second period of time;
- and
- wherein the second period of time is less than the first period of time.
A method of treating an articulation surface of an orthopaedic implant comprising the following steps carried out in order:
- a first step of polishing the articulation surface of the orthopaedic implant;
- a second step of blasting the polished surface of the orthopaedic implant;
- and
- a third step of polishing the blasted surface of the orthopaedic implant,
- wherein blasting comprises wet blasting with a ceramic bead media having a size in the range of B100 to B125 at a pressure of 30-40 psi to increase the roughness of the surface of the metal orthopaedic implant.
Dependencies are inferred from the claim text.