An elongated functional system (1) configured to be advanced in the lumen of a pipe, a duct or a tube, said system having a body part (6) having a main proximal part (2) and a distal part (3), said distal part (3) being a continuous extension of the proximal part (2), said distal part (3) comprising one functional end (3d) terminating with a tip, and at least one active area (3p) located upstream the functional end (3d) on the distal part (3)； and at least one actuator (30d, 30p) configured to transform an amount of energy to the distal part (3) sufficient to cause a reversible curvature of the active area (3p), thereby preventing undesired spring back of the whole system； the actuator (30d, 30p) being connectable to a source of energy.
