Device for administering heat to a cavity, tissue or vessel, characterised in that it takes the form of an insulated copper wire over the length of which is crimped a tube having a resistivity of more than 20 μΩ·cm, the copper wire (1) is in contact with the said tube at its distal extremity, the tube is enclosed over part of its length by at least one movable cylinder having an electrical resistance of less than 20 μΩ·cm, and the movable cylinder and the copper wire have means for connection to a current generator.
