VERTEBRAL SCREW FOR OSTEOSYNTHESIS DEVICE, ESPECIALLY LUMBAR AND DORSAL

摘要

P THIS VERTEBRAL SCREW 1 INCLUDES A THREADED ROD 2 EXTENDED BY A PROFILE NECK 3 AND BY A TERMINAL BODY 4, THESE DIFFERENT PORTIONS BEING REVOLUTION AROUND THE X-X AXIS OF THE SCREW; IN AXIAL SECTION, THE NECK 3 PRESENTS, IN COMBINATION, A CONCAVE6 PART OF WIDTH GROWING IN THE DIRECTION OPPOSED TO THE THREADED ROD 2, THEN A CONVEX PART 7 DEFINING THE BASE OF THE BODY 4, THE PROFILE OF THE CONCAVE PART 6 BEING DETERMINED FOR ALLOW SCREW DRIVING 1 TO THE MIDDLE M OF NECK 3 APPROXIMATELY, WITHOUT DAMAGE TO THE PEDICULAR BONE ELEMENT, WHEN THE CONVEX PART 7 IS DIMENSIONED SO THAT THE TIGHTENING IS NOT BINDED BY THE NEAR BONE PARTS. /P