Ultrasonic catheter (10) designed to break occlusions in blood vessels, the ultrasound catheter (10) comprising: an elongated flexible catheter body (27) having a proximal end, a distal end and at least one lumen； an ultrasound transmission element (140) extending longitudinally through the lumen of the catheter body and having a proximal end and a distal end； a distal head (26) coupled to the distal end of the ultrasound transmission element (140) and disposed adjacent to the distal end of the catheter body (27)； a sonic connector (152) coupled to the proximal end of the ultrasound transmission element (140) for coupling the ultrasound transmission element (140) to an ultrasound transducer device (14)； and a proximal housing (112) coupled to the proximal end of the catheter body (27) and housing the sonic connector (152) and a proximal portion of the ultrasound transmission element (140), wherein the proximal housing (112) includes at least one heat dissipation feature (117, 160, 170, 217, 317) for dissipating heat from the proximal portion of the ultrasound transmission element (140), wherein the heat dissipation feature comprises at least one fluid inlet (117, 217, 317) to allow one or more heat dissipating fluids to pass into an internal cavity of the housing (112), the catheter further comprising a guide wire tube (424) which is extends through at least a portion of the catheter body (27) to allow passage of a guidewire (420), wherein a side wall of the guidewire tube (424) includes a plurality of openings (430) for allow the fluid introduced into the lumen of the catheter body (27) ter pass into and through the guidewire tube (424).Catéter (10) de ultrasonidos diseñado para romper oclusiones en vasos sanguíneos, comprendiendo el catéter (10) de ultrasonidos: un cuerpo (27) de catéter flexible alargado que tiene un extremo proximal, un extremo distal y al menos una luz； un elemento (140) de transmisión de ultrasonidos que se extiende longitudinalmente a través
