Patent ID: 7758620
Filing Date: 2010-07-20
Classification: A61B

Abstract:
1. A device for connecting an osteosynthesis plate having at least one hole to a bone mass comprising at least one fixing element in the form of a threaded rod or screw passing through the hole, the hole housing a ring in the plate, said threaded rod to be screwed into the bone mass, the ring is a constrictive ring having a circular screw receiving bore having a central axis extending through the center of the bore in which a non-circular external profile of the ring cooperates with a non-circular internal profile of the hole of the plate to cause, during rotational movement of the ring in the hole, a constriction of the ring around a trailing end of the rod or screw ensuring the immobilization of the threaded rod and at the same time an immobilization by wedging of the ring in the hole, the ring external profile having at least two raised radial portions spaced at angular intervals around an outermost circumference of the external profile of the ring, the raised radial portions at a radial distance from the central axis of the screw receiving bore in the ring which distance is greater than the distance from the central axis of any portion of the outermost circumference intermediate the raised radial portions, the raised radial portions extending generally perpendicular to the central axis through the center of the screw receiving bore in the ring.