Abstract: A system to actuate and support surgical diagnostic flexible and orientable instruments of the endoluminal and/or endoscopic type, comprising at least a distal part, a proximal part and a medial part, characterized in that at least the distal part consists of vertebrae-like elements formed of portions of two dihedrals, delimited by a cylindrical surface, one of the dihedrals being convex with a projecting edge and belonging to a preceding vertebra, the other dihedral being concave, namely with a reentering edge, belonging to the successive vertebra.