| 摘要 |
An ultrasonic endoscope includes: an objective optical system provided at a tip portion of the ultrasonic endoscope; a treatment tool insertion channel provided along the ultrasonic endoscope, the treatment tool insertion channel having an exit opening at the tip portion; a linear-scanning ultrasonic transducer, provided at the tip portion, for scanning a first scanning plane section which lies on a plane including a shaft axis of the tip portion; and a radial-scanning ultrasonic transducer, provided at the tip portion, for scanning a second scanning plane section which lies on a rotational plane about the shaft axis. The linear-scanning ultrasonic transducer and the radial-scanning ultrasonic transducer are positioned so that the first scanning plane section intersects the second scanning plane section within an optical field of the objective optical system, and wherein the treatment tool insertion channel is formed so that the tip of an tubular instrument, inserted into the treatment tool insertion channel, projects outwards from the exit opening to pass an intersection between the first scanning plane section and the second scanning plane section.
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