| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an ultrasonic endoscope, reducing the risk of accidentally pushing in a piston to a position where suction force is exerted on a balloon mounted to the tip end of an insertion part so that a balloon is contracted unintentionally.SOLUTION: An ultrasonic endoscope includes: a piston 48 slidable to cylinders 35 and 40; a movable body 54 which is located at a non-operation position when the piston is located between a close position and a suction pipe open position and slides together with the piston when the piston is located between the suction pipe open position and a balloon suction pipe open position; first energizing means CS1 for energizing the piston to move toward the close position; second energizing means CS2 for energizing the mover to move toward the non-operation position; and balloon suction pipeline opening and closing O-rings L2, L3 and L4 which cut off the communication between the balloon suction pipeline and a suction source connecting pipeline when the piston is located between the close position and the suction pipe open position, and communicate the balloon suction pipeline with the suction source connecting pipeline when the piston is located on the balloon suction pipe open position.</p> |
