An ultrasonic probe comprises an elongate structure having a longitudinal axis; a first array of ultrasonic transducer elements extending along an outer surface of the elongate structure in a direction generally parallel to the longitudinal axis; a second array of ultrasonic transducer elements extending...http://www.google.se/patents/US7090643?utm_source=gb-gplus-sharePatent US7090643 - Ultrasonic imaging device, system and method of use
