| 摘要 |
PROBLEM TO BE SOLVED: To provide a treating instrument insertion tube of endoscopes which is so built as to secure the sufficient quantity of a perfusate even with a treating instrument inserted thereinto by ensuring the inner diameter of a channel positioned at a curved part. SOLUTION: In the treating instrument insertion tube 9 of an endoscope 1 which has a flexible tube 18 and a coil 19 wound spirally on the outer circumference of the tube 18, the inner diameter of the tube 18 at the part wound with the coil 19 is larger than that of a part wound with no coil 19 between both end parts of the coil 19 in the direction of the long axis of the tube 18. |
