A safety scalpel comprising an elongated central body having opposite ends for respective lancets , wherein the elongated central body comprises a retractable lancet system connected at each of its opposite ends , wherein the retractable lancet system comprises: - a protection member having a slot with stop recesses , a distal opening and an opposite closed end that is connected to the elongated central body , and concentric thereto; - a prismatic guide concentric to the elongated central body that is located inside the protection member ; and - a lancet holding member consisting of: a distal part in the form of a prismatic member in which the lancet is frontally inserted, and a proximal part formed by two parallel arms having an end integral with the prismatic member, a first arm of them being slidable in contact with the prismatic guide and a second arm carrying on a button protruding from the slot of the protection member and being provided with retaining elements intended to be received into the stop recesses of the slot . wherein the elongated central body comprises a retractable lancet system connected at each of its opposite ends , wherein the retractable lancet system comprises: - a protection member having a slot with stop recesses , a distal opening and an opposite closed end that is connected to the elongated central body , and concentric thereto; - a prismatic guide concentric to the elongated central body that is located inside the protection member ; and - a lancet holding member consisting of: a distal part in the form of a prismatic member in which the lancet is frontally inserted, and a proximal part formed by two parallel arms having an end integral with the prismatic member, a first arm of them being slidable in contact with the prismatic guide and a second arm carrying on a button protruding from the slot of the protection member and being provided with retaining elements intended to be received into the stop recesses of the slot . - a protection member having a slot with stop recesses , a distal opening and an opposite closed end that is connected to the elongated central body , and concentric thereto; - a prismatic guide concentric to the elongated central body that is located inside the protection member ; and - a lancet holding member consisting of: a distal part in the form of a prismatic member in which the lancet is frontally inserted, and a proximal part formed by two parallel arms having an end integral with the prismatic member, a first arm of them being slidable in contact with the prismatic guide and a second arm carrying on a button protruding from the slot of the protection member and being provided with retaining elements intended to be received into the stop recesses of the slot . a distal part in the form of a prismatic member in which the lancet is frontally inserted, and a proximal part formed by two parallel arms having an end integral with the prismatic member, a first arm of them being slidable in contact with the prismatic guide and a second arm carrying on a button protruding from the slot of the protection member and being provided with retaining elements intended to be received into the stop recesses of the slot . <EOS>