The invention concerns a multifunctional electrosurgical device for treating biological tissues comprising a first member and a second member linked by a hinge allowing the members to be moved together and apart from each other； the first member comprising, at the front end of same, a first electrode for forming a first electrical contact with the tissues and the second member comprising, at the front end of same, a second electrode for forming a second electrical contact with the tissues. The first electrode has a concave cross-section, capable of partially housing the second electrode and of making the second electrode protrude from the first electrode when the two members are moved together. The device is remarkable in that the electrodes are configured to allow the formation of the first electrical contact on the outer surface of the first electrode and the formation of the second electrical contact on the protruding part of the second electrode.
