Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1990-01-02
1993-03-09
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 228
Patent
active
051923246
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 susbstrate, 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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Pilliar, R. M., "Bony Ingrowth into Porous Metal-Coated Implants", Orthopaedic Review, vol. IX, No. 5, pp. 85-91 (May 1980).
Bobyn et al., "The Optimum Pore Size for the Fixation of Porous-surfaced Metal Implants by the Ingrowth of Bone", Clin. Orth & Rel. Res., No. 150, 1980 (pp. 263-270).
Nilles, J. L. et al., "Biomechanical Evaluation of Bone-Porous Material Interfaces", J. Biomed. Mater. Res., vol. 7, pp. 231-251 (1973).
Hedley, A. K., "Present State, Problems, and Future Implications of Porous-Coated Implants", Chapter 16 in "The Hip Proceedings", C. V. Mosby Co., pp. 329-342 (1980).
Akers Lawrence C.
Howmedica Inc.
Isabella David
Knuth Charles J.
Richardson Peter C.
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