The invention is directed to a catheter system having an ultrasonic delivery device, a dilatation balloon, and a stent. The ultrasonic distal head is used to ablate a lesion permitting the dilation balloon to cross the lesion for dilatation and for delivering the stent to the lesion. A catheter body...http://www.google.de/patents/US6461383?utm_source=gb-gplus-sharePatent US6461383 - Ultrasonic catheter vascular stent system and method
