Patent ID: 6432109
Filing Date: 2002-08-13
Classification: A61B

Abstract:
An osteosynthesis connection device for a vertebral support rod, the device comprising:a) a screw suitable for implanting in a spine, said screw comprising a bottom first threaded portion for implanting in the spine, a head having flats and a curved base, a top second threaded portion in line with the first threaded portion, and a locking nut suitable for co-operating with said second threaded portion and having a curved base, the screw having a central axis not lying in a same plane as a central axis of the vertebral support rod when implanted; b) a connection piece having a bottom bearing face and a top bearing face, said connection piece having, for connection with the screw, a hole of an inside diameter greater than an outside diameter of said second threaded portion of the screw; and c) means for locking the vertebral support rod onto said connection piece, wherein said connection piece is locked in position on said screw once said locking nut has been tightened by said curved base of said locking nut bearing against said top bearing face of said connection piece, and by said bottom bearing face of said connection piece bearing against said curved base of said head of said screw; said curved surfaces of said bases of said head of said screw, of said locking nut, and of said top and bottom bearing faces of said connection piece being portions of spheres all having their centers in the same position, one of said top and bottom bearing faces being convex, and the other being concave, thereby enabling said connection piece to rotate relative to said screw.