A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/32 (2006.01) A61F 2/02 (2006.01) A61F 2/30 (2006.01) A61L 27/04 (2006.01) A61L 27/30 (2006.01) A61L 27/56 (2006.01)
Patent
CA 2706686
A method for producing an orthopaedic implant having enhanced fatigue strength. A forged implant substrate having an elongated stem is incorporated with a melting point lowering substance. Then, metal particles are sintered to the substrate, forming a porous layer on the substrate which enhances bone ingrowth or the mechanical interlock with bone cement. Advantageously, the sintering occurs at a lower temperature than if the substance were not incorporated into the substrate, which in turn results in an enhanced fatigue strength of the inventive implant. The fatigue strength of a forged or cast implant can also be improved by nitrogen diffusion hardening and/or thermally processing the implant after the porous coating is adhered by sintering. Further, the fatigue strength can be further improved by combining incorporating the melting point lowering substance with nitrogen diffusion hardening and/or aging treatment subsequent to sintering.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Shetty H. Ravindranath
Zimmer Technology Inc.
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