Importance

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Abstract

The present invention is an improved unique odd angle internal fixation device for both a transverse and longitudinal fracture located at the junction of the metaphysis and diaphysis of a long bone such as the proximal humerus. The improved odd angle internal fixation device includes an elongated lag screw and a rectangular shaped guide plate having multiple holes throughout the plate to host pins and screws and four tips on the front side of the plate. A lag screw with a cylindric head having a hexagonal cavity introduced through the diaphyseal segment of the fracture at three angles, 90, and 150 and 160 degrees, cross fixing the respective bone longitudinal and transverse fracture line and settling in the depth of the epiphysis. An additional locking screw is introduced on the top of the lag screw head to securely lock the lag screw after being settled into the epiphysis. The guide plate serves as a guide for the lag screw and allows the engagement of the head of the lag screw to the inner wall of its short barrel portion. The engagement would cause the guide plate which is attached to the barrel, to be compressed against the diaphyseal cortex as the lag screw advances deeper into the epiphysis at said three angles.

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First Claim