Abstract: A monopolar electrosurgical instrument includes a hollow cylindrical metallic electrode which is connected to one pole of a radio frequency generator via a first end of the electrode, and a handle connected to and partially covering the electrode. The electrode includes at least one lumen to permit liquid supply of cooling liquid to the hollow electrode, a part covered with an insulative material, and a coagulating and cutting uninsulated tip. The tip includes a round ending part, a part attached to the cutting metal blade near the round ending part, and a part non-attached to the cutting metal blade. It is useful for precisely cutting the tissue that it is previously coagulated, using a single instrument, and avoiding risk of bleeding.

Abstract: A monopolar electrosurgical instrument comprising a cylindrical metallic electrode which is connected to one pole of a radio frequency generator on one extreme; said electrode comprising a liquid supply for cooling, a handle 7 that covers part of the electrode, a part 6 covered with an insulative material, and a coagulating and cutting uninsulated tip; said tip comprising a round ending part 2, a part 3 attached to a cutting metal blade 5 near the end, and a part 4 non-attached to a cutting metal blade. It is useful for precisely cut the tissue that it is previously coagulated, using a single instrument, and avoiding risk of bleeding.

Abstract: An applicator device (1, 1?) for radiofrequency ablation of biological tissues; the device comprises an electrode whose outer surface is covered with an insulating cover (2, 2?) in a proximal portion, and has a conductive distal portion (3, 3?) whose electrode includes internal refrigeration means (7, 7?); an infusion system with a distal end (13, 6) for infusing a fluid in said tissue; wherein said distal end (13, 6) of the infusion system has an electrically insulating outer cover and is located, in the infusion position for said fluid, at a distance between 2 and 5 millimetres from said outer surface of the internally cooled electrode. The invention also concerns a method for ablation by radiofrequency of biological tissues.