The present invention provides for catheter systems and methods of their use. In one embodiment, the invention provides a catheter system comprising a catheter body having a distal end, a proximal end and a working lumen. A cable is disposed within the working lumen. A plurality of transducer elements,...http://www.google.se/patents/US6120454?utm_source=gb-gplus-sharePatent US6120454 - Annular array ultrasound catheter
