Surgery – Instruments – Orthopedic instrumentation
Patent
1989-09-18
1992-05-26
Hafer, Robert A.
Surgery
Instruments
Orthopedic instrumentation
606 63, A61F 504
Patent
active
051163357
ABSTRACT:
An intramedullary device for use in internal fixation of a fracture transverse to the longitudinal axis of a long bone which includes a substantially rigid center rod having a plurality of longitudinal slots extending along the length thereof. One of a plurality of generally flexible outer rods is received and retained within one of the longitudinal slots and thereby extend outwardly from the center rod. Each outer rod has a retention section angulated from the longitudinal axis of the long bone which penetrates through and is retained by the cancellous bone thereby stabilizing the fracture at the distal and proximal ends of the long bone. In order to install the intramedullary device within the endosteal canal, each end of the generally flexible outer rods are coupled to one of a plurality of extension rods of an installation device. The generally rigid center rod is introduced through the central opening of the installation device and thus extends into the endosteal canal. As the center rod is moved into the endosteal canal, each of the outer rods is slidably engaged into one of the plurality of longitudinal slots of the center rod. This movement forces the cutting edge of each outer rod to penetrate through the cancellous bone and allows the retention section of the outer rods to be retained within the cancellous bone thereby stabilizing the fracture of the long bone.
REFERENCES:
patent: 3977398 (1976-08-01), Burstein
patent: 4237875 (1980-12-01), Termanini
patent: 4522200 (1985-06-01), Stednitz
patent: 4728333 (1988-03-01), Masse
patent: 4858602 (1989-08-01), Seidel
patent: 4919678 (1990-04-01), Kranz
Hannon Gerard T.
Molnar, deceased James
Molnar, executrix Lucienne
Brown Michael
Hafer Robert A.
Razzano Pasquale A.
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