Surgery – Instruments – Orthopedic instrumentation
Patent
1990-01-19
1992-04-28
Isabella, David
Surgery
Instruments
Orthopedic instrumentation
623 66, 606100, A61F 504
Patent
active
051084023
ABSTRACT:
A method and apparatus for removing a pre-placed prosthetic joint from a bone cavity and conditioning the cavity for receipt of a replacement joint. The pre-placed joint is first pulled from the mantle of hardened cement holding it within the cavity, thus leaving a cavity within the mantle. A mass of fluid cement is then placed within the cement cavity, after which a pulling tool is inserted into the fluid cement and the fluid cement is permitted to cure to bond with the hardened cement and form an integral mass. The pulling tool has helical screw thread on it, with means to connect a slap-hammer to its proximal end, so that its insertion into the fluid cement defines a threaded passageway. The pulling tool is then partly removed from the passageway by unscrewing it. Tension is then applied to the pulling tool to remove the tool and the cement mantle surrounding it from the bone cavity. The tool is then reinserted and the process is repeated as many times as desired until all of the cement mantle is removed. Alternatively, multi-piece tools may be used so that when the tool is partly removed from the mantle, a portion of the tool remains behind for later use, thus saving the step of reinserting the tool.
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"Revision in Surgery for Failed, Monseptic Total Hip Arthoplasty-The Femoral Side", William H. Harris, M.D., pp. 8-20.
"Moglichkeiten der Anwendung von Autraschallwerkzeug bei Endoprothesenwechsel", E. Nieder, E. Engelbrecht, U. Roder und E. Strickle, DER CHIRURG, 1979.
Isabella David
Nguyen Dinh X.
Origin Medsystems Inc.
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