Endoprosthesis for the knee joint

Details Endoprosthesis for the knee joint Endoprosthesis for the knee joint

1992-11-30

1994-07-05

Green, Randall L.

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

Implantable prosthesis

Bone

623 38, 403104, 403109, 403327, A61F 238

Patent

active

053263600

ABSTRACT:
An expandable endoprosthesis for a joint and adjacent bone parts has first and second joint component parts. The second component has a part at one end thereof for a portion of a joint. The second component has a telescoping stem coupled to its joint part for attachment to a long bone. The telescoping stem has an inner and an outer member axially adjustable with respect to one another by means of a threaded spindle and a threaded spindle nut attached respectively to either the inner or outer member. A pinion gear is attached to either the spindle or spindle nut for rotation therewith. An indexing system is provided to rotate the pinion a predetermined amount upon movement of the first and second joint components towards one another after implantation and thereby lengthen the second joint component stem.

REFERENCES:
patent: 1474325 (1923-11-01), Kallmeyer
patent: 2555515 (1951-06-01), Slater
patent: 2700772 (1955-02-01), Davidson et al.
patent: 3837753 (1974-09-01), Weiste et al.
patent: 4502160 (1985-03-01), Moore et al.
patent: 4892546 (1990-01-01), Kotz et al.

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