| 摘要 |
PROBLEM TO BE SOLVED: To accomplish a backing function in a backing layer, and to reduce the diameter of the distal end hard part of an endoscope insertion tube. SOLUTION: The backing layer 22 constituting an ultrasonic vibrator array 24 in the distal end hard part of the endoscope insertion tube 2 is formed to be a substantially cylindrical shape. One or a plurality of notched parts are formed in a part of the inner peripheral surface. One member constituting an endoscope mechanism inside the backing layer 22 is partially protruded to the notched part. Then the outer diameter of a tunnel shape passage 25 is reduced. In the ultrasonic endoscope, the notched part is formed, so as to allow the total value of a distance for the progress of ultrasonic wave transmitted from ultrasonic vibrators 21 before being made incident to the notched part and a distance for the progress after being reflected against the notched part to be longer than a distance for the reciprocation of the ultrasonic wave transmitted from the ultrasonic vibrators 21 when regularly reflected against the backing layer 22 at a part other than the notched part. COPYRIGHT: (C)2006,JPO&NCIPI
|
