An ultrasound catheter (10), comprising: an elongated flexible catheter body (12) having a proximal end, a distal end and at least one longitudinally extending light therethrough； an ultrasonic transmission element (30) extending longitudinally through the light of the catheter body (12), the ultrasonic transmission element (30) having a distal end that is located at the distal end of the catheter body (12), and a proximal end that can be connected to a separate ultrasonic generating device； a distal head (34) mounted at the distal end of the catheter body (12), in which the distal head (34) has a generally rounded configuration, and has a proximal part (34b) whose outer diameter is slightly smaller than the external diameter of the distal part (34a) of the distal head (34), to define an annular flange (38), in which a distal end (42) of a spiral (40) joins the annular flange (38), in which a proximal end of the spiral joins the distal end of the catheter body, the ultrasonic transmission element (30) being firmly held within a hole (62) of the distal head (34), the ultrasonic transmission element having (30) a more distal part, an intermediate part and a proximal part, the most distal part, the intermediate part and the proximal part being arranged in this order and being directly adjacent to each other, the most distal part having a diameter greater than the intermediate part and having or the proximal part a diameter greater than the intermediate part, the most distal part and the proximal part having a substantially constant diameter, characterized by being the intermediate part completely contained within the spiral (40) and having a length substantially equal to the distance between the distal end of the catheter body and the proximal end of the distal head.Un catéter de ultrasonidos (10), que comprende: un cuerpo de catéter flexible alargado (12) que tiene un extremo proximal, un extremo distal y al menos una luz que se extiende longitudinalmente a través del
