Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making porous product
Patent
1992-12-04
1995-08-15
Isabella, David
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making porous product
623 16, 623 66, 427 227, 419 6, A61F 202
Patent
active
054415373
ABSTRACT:
An improved metallic bone prosthesis having a porous coating for bone ingrowth or interlocking with bone cement is disclosed. The porous coating comprises two layers of generally ball-shaped metallic particles bonded together at their points of contact, e.g. by sintering, and defining between them a plurality of connected interstitial pores having an average pore size of from about 350 microns to about 500 microns. A high resistance to failure at the coating-substrate and bone-coating (or cement-coating) interfaces is achieved with the use of the improved prosthesis. Also disclosed are a novel method for affixing the porous coating to a metal substrate, and a knee joint prosthesis having bearing portions designed so that the function of said prosthesis closely approximates that of the natural knee.
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"Interface Mechanics of Porous Titanium Implants" by A. Clemow et al, Journal of Biomedical Materials Research, vol. 15, 1981, pp. 73-82.
"Biomechanical Evaluation of Bone-Porous Material Interfaces", by J. L. Nilles et al, Journal of Biomedical Materials Res., vol. 7, 1973, pp. 231-251.
"Present State, Problems, and Future Implications of Porous-Coated Implants", by Anthony K. Hedley, Complications in Total Hip Replacement, Chapter 16, pp. 329-342.
"Bony Ingrowth Into Porous Metal-Coated Implants" by R. M. Pilliar, Ph.D., Orthopaedic Review, vol. IX, No. 5, May 1980, pp. 85-91.
Akers Lawrence C.
Augustin Raymond W.
Howmedica Inc.
Isabella David
Richardson Peter C.
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