Bone fixation device

摘要

A bone fixation device for repairing a fracture of the proximal femur is disclosed. It includes a jack tube, a compression screw and a nail. The jack tube is an elongated tubular member having a base plate and a side wall defining central passageway. The base plate is arranged to be secured to the femur by screws. The side wall of jack tube includes plural longitudinally extending slots. The nail is a tubular member having plural linear blades located in respective slots in the jack tube and plural spikes extending out of the distal end of the nail. The compression screw is arranged to be disposed within the nail to form a slidable unit and has internal threads to engage threads in the jack tube so that rotation of the compression screw slides the nail down the jack tube, with the blades and spikes digging into the surrounding bone.

主权项

1. A bone fixation device for introduction into an angularly extending bore in the femur of a patient to repair a fracture of the proximal femur, said device comprising a jack tube, a compression screw and a nail, said jack tube being configured to be located within the bore in the femur and comprising an elongated tubular member having a central longitudinal axis, a side wall, a central passageway extending through said side wall and along said central longitudinal axis, a base plate located at a proximal end of said central passageway, said base plate being configured to be secured to the femur by a cancellous screw and at least one cortical screw and having an opening in communication with said central passageway, said tubular member having a distal end to which a rod is fixedly secured and from which said rod extends in the proximal direction centered on said central longitudinal axis, said rod having external threads and a central canal extending through said rod centered on said central longitudinal axis, said jack tube additionally comprising at least one elongated slot extending through said side wall parallel to said central longitudinal axis along at least a portion of the length of said jack tube from said opening in said base plate, said nail comprising a tubular member having at least one linear blade extending outward therefrom along a substantial portion of the length of said nail, said compression screw comprising a tubular member having internal threads and being configured to be disposed within said nail to form a slidable unit, said slidable unit being configured to be disposed within said passageway in said jack tube with said at least one blade of said nail extending radially outward through said at least one slot in said jack tube so that a portion of said at least one blade extends out of said slot and with said internal threads of said compression screw engaging said external threads of said rod, whereupon rotation of said compression screw in a first rotational direction causes said slidable unit to move in the distal direction down said passageway in said jack tube, whereupon said portion of said at least one blade cuts into contiguous portions of the femur as said slidable unit moves through said jack tube, thereby preventing the rotation of said bone fixation device in said bore in the femur.