Multifunctional surgical instrument for extension of laparotomic, laparoscopic, robotic and thoracotomic incisions, allowing at the same time the spreading apart of the cutaneous/subcutaneous corners, pinching and lifting of the deep parietal layer, its dissection with the electrosurgical knife and protection of the surrounding and underlying tissues, particularly the intestinal ansae in the peritoneal cavity, during the dissection itself. The instrument comprises a handle with two rings, upper and lower, two straigth branches, upper and lower, and a toothed racked stopper, after connecting through a hub the two branches extend to constitute the two prongs of the bite, the lower straight branch extends to constitute the upper prong which after an angle of approximately 130 degrees becomes shaped as an L ribbon- like retractor, centrally fenestrated with a paddle angulated at 90 degrees, facing upwards, terminating at the top with an outwards angulation, the upper straight branch extends to constitute the lower prong of the bite which, too, after an angle of approximately 130 degrees at the same level as the angle of the upper prong, becomes shaped as a curved concave valve, with all the components of the surgical instrument situated distally to the upper third of the straight branches of the handle being covered with proper electrical insulated coating.La présente invention concerne un instrument chirurgical multifonction pour l'extension d'incisions laparotomiques, laparoscopiques, robotiques et thoracotomiques, permettant en même temps l'écartement des coins cutanés/sous-cutanés, le pincement et le levage de la couche pariétale profonde, sa dissection avec le couteau électrochirurgical et la protection des tissus environnants et sous-jacents, en particulier les anses intestinales dans la cavité péritonéale, pendant la dissection elle-même. L'instrument comprend une poignée avec deux anneaux, supérieur et inférieur, deux branches droites, supérieure et inférieure,
