Bone gap bridging and fusing device

Claim 1

A bone gap bridging and fusing device for use where large portions of the bone are removed in limbs comprising first and second pin members adapted to be placed in axial opening formed in the opposed remaining bone portions, each pin member including an enlarged head on one end of the pin member having an outer surface adjacent the pin for engaging the end of the bone having an axial opening therein and an inner planar contacting surface, the inner planar contacting surfaces on the inner ends of said first and second pin members facing one another and being adapted to abut one another, each head having threads on the periphery of said head and extending in the same direction, said inner planar contacting surfaces of said first and second pin members having at least two axially extending projections on said inner surface of said first member and at least two complementary recesses on the said inner surfaces of said pin member, said projections and recesses being axially engageable by axial movement only and being fully engaged when the inner contacting surfaces of said heads are in abutting relation and being constructed and arranged to prevent relative rotation between said pin members, the lengths of said projections and recesses being such that they can be axially engaged when the pin members are placed in axial openings in opposed remaining bone portions, the remaining portions of said inner contacting surfaces of said first and second pin members being in abutment when said projections and recesses are in engagement, said threads on each said head extending to the inner contacting surface thereof and said projections and said recesses being constructed and arranged to orient said heads circumferentially to when said projections and recesses are engaged such that said threads are aligned to form a continuous thread, a collar having internal threads threaded onto the threads of said heads thereby fixing said first and second pin members against axial movement.