Patent ID: 8066643

Claim:
An ultrasonic endoscope comprising: an ultrasonic transducer in a cylindrical shape including a plurality of piezoelectric devices, an acoustic matching layer stacked on a principal plane on a sound emitting plane side, an acoustic lens on a plane of the acoustic matching layer opposite to a plane facing the piezoelectric devices, and a backing material stacked on another principal plane of the piezoelectric devices; an endoscopic observation and endo-therapy unit provided, for performing endoscopic image observation, at a proximal end side of the ultrasonic transducer; a cable assembly formed by grouping a plurality of cables for transmitting signals to and from the ultrasonic transducer, wherein: the cable assembly is arranged in such a manner that the cable assembly passes through an inside portion of the ultrasonic transducer and is connected to the ultrasonic transducer at a distal end side of the ultrasonic transducer; wherein the ultrasonic transducer includes a ring-shaped frame member in an inside portion of the distal end side for forming the cylindrical shape; the ultrasonic endoscope further includes a ring-shaped circuit board having an outer diameter that is greater than an inner diameter of the frame member and that is smaller than an inner diameter of the ultrasonic transducer, for connecting respective cables included in the cable assembly to the ultrasonic transducer; and the circuit board is locked in the frame member at the distal end side of the ultrasonic transducer.