Patent ID: 8337534
Filing Date: 2012-12-25
Classification: A61B

Abstract:
1. A device for use in the treatment of proximal humerus fractures having a substantially spoon-shaped body 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 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 defining a shoulder in the central bulge; wherein the device further comprises an eccentric ring comprising an outer continuous cylindrical surface matching the counterbore with a first axis, and an inner continuous 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 abutting against the shoulder and adapted to embrace the head portion of the stabilizing screw, so that the entire continuous cylindrical inner surface of the ring is in contact with the head of the stabilizing screw during use and the entire continuous cylindrical outer surface of the ring 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; and further comprising a fastpin inserted in a corresponding through hole in the central bulge, the through hole being transverse to the counterbore, the eccentric ring having a circular groove obtained on the outer cylindrical surface that cooperates with the fastpin in such a manner to constrain the fastpin further ensuring the clamping of the eccentric ring to the body.