Patent ID: 6206881
Filing Date: 2001-03-27
Classification: A61B,A61L

Abstract:
A system for fixation of bone fragments comprising a bone plate made of a non-resorbable polymer material with a plurality of conical plate holes each defined by a plate hole surface tapering toward a bone contact surface and at least two bone screws for anchoring the bone plate to a bone, each said screw having a conical head with a structured lateral outside surface, said head shaped to match the plate holes and used in insertion into said holes, the bone screws further comprising a threaded shank for anchoring into the bone,wherein the structured lateral outside surface of each conical screw head has a greater hardness than each plate hole surface so that insertion of the bone screws into the plate holes at other than a coaxial position still allows geometric locking to be achieved between each screw and plate hole by penetration of the respective plate hole surface by the harder structured lateral outside surface of the conical screw head.