Device for electrotherapy and/or electrophysiology comprising: - at least one lead having an elongated lead body extending along a longitudinal direction (X-X) and comprising a proximal end and a distal end; and - at least one paddle having a paddle body comprising two opposite major surfaces (6, 7) defining a paddle thickness there between; and wherein: - said paddle comprising at least one paddle electrode having an exposed surface designed to come into electrical contact with a living anatomy inside a patient's body; - said paddle is suitable to modify the transverse extension thereof, so that to assume at least one transport configuration and at least one operative configuration, wherein the transverse extension of the paddle when in said at least one transport configuration is less than the transverse extension of the same paddle when in said at least one operative configuration; and wherein: - said lead comprising a connection portion near the distal end thereof; characterised in that - said connection portion of the lead comprises at least one arched electrically conductive surface; and - said paddle comprises at least one counter-connection portion comprising at least one arched electrically conductive counter-surface in direct contact with said at least one conductive surface of the connection portion of the lead, so that said at least one counter-connection portion of the paddle has a transversally arched shape defining a first concavity facing towards said connection portion of the lead; - said at least one conductive counter-surface of the paddle is in electric communication with said paddle electrode through at least one conductive track extending within the body of paddle in such way that said proximal end of the lead is in electrical communication with said exposed surface of the at least one paddle electrode. - at least one lead having an elongated lead body extending along a longitudinal direction (X-X) and comprising a proximal end and a distal end; and - at least one paddle having a paddle body comprising two opposite major surfaces (6, 7) defining a paddle thickness there between; - said paddle comprising at least one paddle electrode having an exposed surface designed to come into electrical contact with a living anatomy inside a patient's body; - said paddle is suitable to modify the transverse extension thereof, so that to assume at least one transport configuration and at least one operative configuration, wherein the transverse extension of the paddle when in said at least one transport configuration is less than the transverse extension of the same paddle when in said at least one operative configuration; and wherein: - said lead comprising a connection portion near the distal end thereof; characterised in that - said connection portion of the lead comprises at least one arched electrically conductive surface; and - said paddle comprises at least one counter-connection portion comprising at least one arched electrically conductive counter-surface in direct contact with said at least one conductive surface of the connection portion of the lead, so that said at least one counter-connection portion of the paddle has a transversally arched shape defining a first concavity facing towards said connection portion of the lead; - said at least one conductive counter-surface of the paddle is in electric communication with said paddle electrode through at least one conductive track extending within the body of paddle in such way that said proximal end of the lead is in electrical communication with said exposed surface of the at least one paddle electrode.