Ultrasound catheter apparatus

An ultrasound catheter for disrupting occlusions in blood vessels, the ultrasound catheter comprising:

• an elongate flexible catheter body having a proximal end, a distal end and at least one lumen;
• an ultrasound transmission member extending longitudinally through the lumen of the catheter body, the ultrasound transmission member having a proximal end;
• a sonic connector coupled with the proximal end of the ultrasound transmission member for coupling the ultrasound transmission member with a separate ultrasound generating device, the sonic connector comprising a proximal portion and a distal portion, wherein the distal portion of the sonic connector contacts the ultrasound transmission member, and wherein the proximal portion of the sonic connector is attached to the ultrasound generating device;
• and
• at least one absorber member coupled with the ultrasound transmission member adjacent the sonic connector,
• wherein the at least one absorber member comprises at least two component parts, the component parts comprising:
• at least one vibrational absorber in contact with the transmission member for absorbing vibrations;
• and
• at least one constraining member coupled with the vibrational absorber for holding the vibrational absorber in place on the transmission member and for absorbing heat, wherein the at least one constraining member overlaps a portion of the sonic connector.