Artificial hip joint

Details Artificial hip joint Artificial hip joint

1993-03-26

1995-05-09

Isabella, David

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

Implantable prosthesis

Bone

623 18, A61F 232

Patent

active

054136105

ABSTRACT:
An artificial hip joint of the type wherein a metal stem is fitted into the tapered hall of a ceramic stem head via a tapered cone in the stem, the hip joint being characterized in that the tapered stem engages the tapered hall in the deeper portion of the tapered hall, whereby the compression strength (fracture load) of the stem head is improved. Deep engagement of the tapered stem within the tapered hall is accomplished by, for example, making the angle of the taper of the tapered cone slightly smaller than that of the tapered stem. Preferably, the angle of taper of the tapered cone is smaller than that of the tapered hall by about 40 minutes or less. In addition, the diameter at the base of the hall is enlarged to form a cavity.

REFERENCES:
patent: 4012795 (1977-03-01), Doore et al.
patent: 4032994 (1977-07-01), Frey
patent: 4058856 (1977-11-01), Doerre et al.
patent: 4268919 (1981-05-01), Zeibig
patent: 4318190 (1982-03-01), Cortesi
patent: 4687488 (1987-08-01), Frey
patent: 4842605 (1989-06-01), Sonnerat et al.
patent: 4921500 (1990-05-01), Averill et al.
patent: 4964869 (1990-10-01), Auclair et al.

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