Abstract: An ultrasonic recanalization system includes an ultrasonic transducer member energized by a switch and connected to a console containing control elements. The transducer transfers ultrasonic energy through a tube into a patient's artery through a triple lumen catheter. The tube has at its end a bent portion with a flexible tip and the catheter has a flow blocking device which is inflatable to secure the position of the tip of the hollowed tube in the artery and to obstruct the flow of blood near a stenosis site in the artery. A liquid solution can be pumped into a concentric canal passage around the hollowed tube and the solution can then flow out through the hollowed tube after washing off the stenosis splinters.