Surgical implant having multiple layers of sintered porous coati

Details Surgical implant having multiple layers of sintered porous coati Surgical implant having multiple layers of sintered porous coati

1990-10-22

1992-04-14

Green, Randall L.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

427 2, 427405, A61F 226

Patent

active

051044102

ABSTRACT:
A surgical prosthetic device for implant in a patient and method for making said device, the device comprising a composite structure having a solid metal substrate and a porous coating with multiple sintered layers. The porous coating has an external layer to accept bone ingrowth. An intermediate layer bonds the external porous layer to the substrate. The layers are applied in a process of multiple sintering, whereby each successive layer is individually sintered to the substrate or to the proceeding layer, as applicable. This process provides a porous area having increased strength of attachment between the substrate and the external porous layer. An acid etch solution promotes adhesion between the substrate and the intermediate layer thus increasing the consistency of the process. The initial sintering is held at elevated temperature for less time than the sintering of the external layer. At the end of each sintering step, the prosthesis is quick cooled using an inert gas, preferably helium.

REFERENCES:
patent: 4702930 (1987-10-01), Heide et al.
patent: 4813965 (1989-03-01), Roberts
patent: 4854496 (1989-08-01), Bugle
patent: 4902535 (1990-02-01), Garg et al.

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