Connecting member to connect an elastic rod with a spinal pedicle screw

Verbindungsglied (2) zum Verbinden eines elastischen Stabes (1) mit einer in einem Wirbelknochen (7) verankerbaren Knochenschraube (8) sowie Vorrichtung zum Verbinden von mindestens zwei Wirbelknochen (7) durch Verbindungsglieder (2) mit einem Stab (1). The hole (3) has a round inner periphery (4) formed of several curved part surfaces (4a,b,c) with at least three different radii of curvature (r1,r2,r3). The inner periphery and/or the surface of the rod (1) inserted through the hole has ridged recesses so as to reduce the contact surface between the rod and the holder part. The holder part has a cavity for a fastening (6a) acting on the rod inside the hole. The part surface opposite the hole has a radius of curvature less than the rod's radius of curvature.