Abstract: The electrode of a manipulator cuts tissue. The scalpel has rectifying circuit for supplying a rectified voltage to a radio frequency circuit which produces an output current signal at a substantially constant frequency to the electrode. The radio frequency circuit has an electronic switch controlled by an oscillator and pilot circuit. According to the method a wave form is applied to the electrode having such a power that the energy transferred to the manipulator is substantially equal to the sum of the energies required to break the bonds of the molecules of the tissue to be cut. The invention relates also to the electronic scalpel carrying out said method.

Abstract: The invention realizes a radio knife powered by an electronic circuit that operates with high-frequency current wherein said circuit comprises: a rectifier circuit (20) fed by the mains voltage that supplies rectified pulsating voltage (201) to a radiofrequency circuit (30); a radiofrequency circuit (30) capable of emitting an output current signal (301) with a constant frequency in the scale of the MHz, powering the radio knife by means of a radiofrequency transformer (40). Said radiofrequency circuit (30) is obtained by piloting a MOSFET (305) through a pilot circuit (306) comprising a quartz-operated oscillator whose oscillation frequency amounts to at least twice the usual operating frequency of the MOSFET.