Joint implant with self-engaging attachment surface

Details Joint implant with self-engaging attachment surface Joint implant with self-engaging attachment surface

1996-07-19

1998-05-26

Milano, Michael J.

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

Implantable prosthesis

Bone

623 22, 623 23, A61F 230

Patent

active

057557993

ABSTRACT:
The invention shows process steps for the production of attachment faces (3) on metal joint implants, which stand at an angle 0<a<90 degrees against the insertion and attachment direction (40) and comprise cupular shoulder portions (14), which are opened for attachment against the insertion and attachment direction (40). In a first step recesses (6) and shoulders (8) are produced by machining, casting or pressing in the attachment faces (3) of a blank (2) at right angles to the insertion and attachment direction (40). The shoulders (8) have an acute-angled cross section, have a height of between 0.3 and 2 mm and a spacing (31) which corresponds roughly to the twice the height (10). In a second step troughs (15) through the shoulders (8) are produced by a pressing tool (13), which comprises counter faces to the attachment faces (3), which counter faces are provided with protruding ribs (26) which stand with their center planes perpendicular to the counterface and parallel to the insertion and attachment direction (40). The edges (17) of the shoulder portions (14) are deformed and cupular shapes (18) opened against the insertion and attachment direction (40) are produced for support.

REFERENCES:
patent: 4865603 (1989-09-01), Noiles
patent: 4883491 (1989-11-01), Mallory
patent: 4955917 (1990-09-01), Karpf
patent: 5047059 (1991-09-01), Saffar
patent: 5108446 (1992-04-01), Wagner
patent: 5358532 (1994-10-01), Evans

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