Surgery – Instruments – Orthopedic instrumentation
Patent
1991-06-25
1992-06-16
Hafer, Robert A.
Surgery
Instruments
Orthopedic instrumentation
606 99, 606100, A61F 500, A61F 232
Patent
active
051221438
ABSTRACT:
A method and apparatus for removing a pre-placed prosthetic appliance anchored in place in a bone recess by a cement mantle and conditioning the recess for receipt of a replacement appliance. The preplaced appliance is first pulled from the mantle of hardened cement holding it within the recess, thus leaving a cavity within the mantle. A screw threaded post having nuts threadably engaged therewith at longitudinally spaced locations is then anchored within the cavity with a new mass of cement. Thereafter, the post is threadably disengaged from the nuts, leaving the nuts in place within the new mass of cement. A pulling tool is then successively engaged with the nuts and tensioned to incrementally remove the mantle from the recess.
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patent: 5020519 (1991-06-01), Hayes
McColl Milton B.
Moll Frederic H.
Brown Michael
Hafer Robert A.
Origin Medsystems Inc.
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