A percutaneous introducer, particularly for flexible drainage tubes and with various profiles, includes a main body, the main body having a longitudinally extended tubular element arranged in the distal portion of the main body. The tubular element has a terminal arranged at the distal end of the tubular element. The percutaneous introducer has a sliding body which includes a longitudinally extended obturator arranged in the distal portion of the sliding body, the obturator being inserted and being movable longitudinally within the tubular element of the main body. The obturator includes a cutting blade arranged and fixed at the distal end of the obturator. The percutaneous introducer includes a return and positioning spring adapted to return the cutting blade to a retracted position within its seat, following the controlled exit of the cutting blade through a passage slot arranged in the terminal of the tubular element.