An ultrasonic transducer includes an elongated catheter that carries a phased linear array of ultrasonic transducer elements at a distal end. This array is aligned with the azimuthal axis of the array oriented substantially parallel to a longitudinal axis of the catheter near the distal end. Two sets...http://www.google.se/patents/US6228032?utm_source=gb-gplus-sharePatent US6228032 - Steering mechanism and steering line for a catheter-mounted ultrasonic transducer
