Metallic implants having roughened surfaces and methods for producing the same
AssigneeDePuy Products, Inc.
InventorsHai Bo Wen, Panjian Li, Todd Smith
Life of this patent
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Abstract
The invention provides a method of providing a metallic orthopaedic implant with a micron or nanometer-scale surface roughness to facilitate acceptance of tissue and bone growth or apposition after implantation while maintaining the structural integrity of the orthopaedic implant. The invention also provides a metallic orthopaedic implant comprising a metallic body and metallic elements adhered to a portion of the surface of the metallic body to define a three-dimensional porous surface geometry, wherein at least some of the metallic elements have a micron or nanometer-scale surface roughness.
Claims36
A method of providing a metallic orthopaedic implant with a micron or nanometer-scale surface roughness to facilitate acceptance of tissue and bone growth or apposition after implantation while maintaining the structural integrity of the orthopaedic implant, which method comprises the steps of:
- (a) providing a metallic orthopaedic implant comprising a metallic body having a surface and metallic elements adhered to at least a portion of the surface of the metallic body to define a three-dimensional porous surface geometry,
- (b) exposing at least a portion of the surface and metallic elements to an etching solution comprising (i) at least one fluoride salt, (ii) at least one acid, and (iii) water for a time and under conditions sufficient to provide the implant with micron or nanometer-scale surface roughness while maintaining structural integrity of the orthopaedic implant,
- (c) cleaning at least the portion of the surface and metallic elements exposed to the etching solution, and
- (d) drying the metallic orthopaedic implant.
A metallic orthopaedic implant comprising (i) a metallic body having a surface and (ii) metallic elements adhered to a portion of the surface of the metallic body to define a three-dimensional porous surface geometry, wherein at least some of the metallic elements are interconnected to provide pores of 10 μm or more diameter between adjacent metallic elements, and wherein at least some of the metallic elements have a micron or nanometer-scale surface roughness.
A method of providing a metallic orthopaedic implant having a native oxide surface layer with a micron or nanometer-scale surface roughness to facilitate acceptance of tissue and bone growth or apposition after implantation while maintaining the structural integrity of the orthopaedic implant, which method comprises the steps of:
- (a) providing a metallic implant having a native oxide surface layer and at least a portion thereof to be altered to provide a micron or nanometer-scale surface roughness,
- (b) exposing the portion of the surface layer to an etching solution comprising (i) at least one fluoride salt, (ii) at least one acid, and (iii) water for a time and under conditions sufficient to provide the implant with the micron or nanometer-scale surface roughness while maintaining structural integrity of the orthopaedic implant,
- (c) cleaning at least the exposed surface, and
- (d) drying the metallic orthopaedic implant.
Dependencies are inferred from the claim text.