Enhanced fatigue strength orthopaedic implant with porous...

A - Human Necessities – 61 – L

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A61L 27/04 (2006.01) A61F 2/30 (2006.01) A61L 27/30 (2006.01) A61L 27/56 (2006.01) B22F 7/00 (2006.01) C23C 8/24 (2006.01) C23C 24/08 (2006.01) A61F 2/00 (2006.01) A61F 2/36 (2006.01)

Patent

CA 2299939

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.

Technique permettant de produire un implant orthopédique ayant une résistance accrue à la fatigue. On mélange le substrat forgé d'un implant muni d'une longue tige à une substance abaissant le point de fusion. Puis, on procède au frittage des particules de métal avec le substrat, ce qui forme une couche poreuse sur le substrat, laquelle favorise la croissance des cellules osseuses dans le substrat ou un verrouillage mécanique avec le ciment osseux. Il est avantageux que le frittage survienne à une température inférieure à celle de la substance non mélangée au substrat, car ce procédé permet d'augmenter la résistance à la fatigue de l'implant de l'invention. La résistance à la fatigue d'un implant forgé ou coulé peut aussi étre améliorée par un durcissement par diffusion d'azote et/ou par un procédé thermique après l'application d'une couche poreuse par frittage. En outre, on peut davantage améliorer la résistance à la fatigue en combinant une substance abaissant le point de fusion et un durcissement par diffusion d'azote et/ou un vieillissement précédé d'un frittage.

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