Method of making bone-implants

Details Method of making bone-implants Method of making bone-implants

1992-12-03

1994-08-09

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making porous product

419 5, 419 6, 419 23, 419 33, 419 36, 419 38, 419 44, B22F 306

Patent

active

053364651

ABSTRACT:
A slurry compound prepared by a sintering powdery material and a binder is press-molded to obtain a contour for the final product applicable to a bone-implant such as hip prosthesis. The molded body is given a programmed movement of rotation and/or swinging to impart a centrifugal force to the sintering particles which direct toward the inner wall of the mold cavity. The final product obtained after sintering has a hollow interior having no communication to the outside. Imparting conditions of rotating/swinging movement may be changed or programmed in order to achieve a desired structure or constitution of the final product. By way of example, larger particles concentrate near the inner wall of the mold to provide a rough, porous surface of the body, whereas it has a dense core consisting mainly of sintered fine particles. A hip prosthesis having a ceramic-rich femoral head and a metal-rich stem may also be produced by so programming the movement imparting conditions.

REFERENCES:
patent: 4156943 (1979-06-01), Collier
patent: 4473526 (1984-09-01), Buhler
patent: 4822692 (1989-04-01), Koehler
patent: 5047054 (1991-09-01), Vijayan et al.
patent: 5169577 (1992-12-01), Feichtinger
patent: 5188793 (1993-02-01), Nishio
patent: 5217664 (1993-06-01), Feichfinger
Chemical Engineers Handbook, 6th Ed., McGraw-Hill (1984).

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