Device for the ostheosynthesis of proximal humerus fractures

A device for use in the treatment of proximal humerus fractures, having a substantially spoon-shaped body, or plate, comprising:

• a blade-like proximal portion intended to complement a portion of the humerus head and provided with at least one seat in which to insert a wire, a threaded nail, or a similar element to stabilize the fracture;
• a plate-like and elongate distal portion, intended to complement the humerus neck and provided with at least one seat in which to insert a screw or a similar element to fix the body to the humerus;
• a central bulge, or block, interposed between the proximal portion and the distal portion, having a thickness greater than both the proximal and the distal portions and including a central seat in which to insert a stabilizing screw intended to stabilize the humerus head;
• a cylindrical counterbore obtained in the central bulge and communicating with the central seat, said counterbore being eccentrically placed with respect to the central seat;
• and
• wherein the device further comprises an eccentric ring comprising an outer cylindrical surface with a first axis, and an inner cylindrical surface with a second axis offset with respect to the first axis, an annular seat being defined between the counterbore and a head portion of the stabilizing screw when it is inserted in the central seat, the eccentric ring being positioned within said annular seat embracing the head portion of the stabilizing screw, so that the ring inner surface is in contact with the head of the stabilizing screw and the ring outer surface is in contact with the counterbore, said eccentric ring being arranged to wedge by rotation between the counterbore and the stabilizing screw, radially forcing the latter to press on a side thereof in the seat within the bulge, so that the stabilizing screw is tightened to the bulge and any axial movement of the stabilizing screw is prevented.