Improved electrotherapy device, the device being of the type that includes a single needle (21) arranged in a needle housing (2) and the needle housing (2) consisting of a head (4) and a body (23), the needle acting as a cathode, a surface-applied electrode, which can be held by hand or attached to the patient's epidermis, as an anode, a unit for generating and controlling electrical current (1) and the tissue of the patient the electrolyte, presenting the electric current control unit (1), on its back, a support (3) for housing the needle (2), characterized in that the support (3) is formed based on an element of connection (31) to the control unit (1) coupled to said control unit (1) and includes at least two projecting fins (34) that are detachably coupled to two support elements (35, 36), these serving support elements (35, 36) to support the needle housing (2) and these support elements (35, 36) are interchangeable with each other, so that the support (3) is reversible. (Machine-translation by Google Translate, not legally binding)