Acetabular cup assembly

Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone

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623 18, A61F 232

Patent

active

056096488

ABSTRACT:
A joint socket (2) for a hip joint prosthesis comprises an outer shell (5) adapted for being anchored into a bone seat and an inner shell (6) adapted for receiving a ball of a joint. A threaded plug (10) is threadably coupled within a threaded bore (8) of the outer shell and a projection (22) extends from the polar region of the inner shell into an axial recess (20) of the threaded plug for centering the inner shell relative to the outer shell. The threaded plug seals off the inner volume of the outer shell, thereby preventing contact between rubbed off particles of the interacting inner and outer shells and the bone tissue. In addition, it allows the surgeon to directly observe the bone tissue lying behind the threaded bore of the implanted outer shell.

REFERENCES:
patent: 4211325 (1980-07-01), Wright
patent: 4955325 (1990-09-01), Zarnowski
patent: 5021062 (1991-06-01), Adrey
patent: 5360452 (1994-11-01), Engelhardt

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