| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible tube for endoscope, which has a circular cross section having no unevenness on the surface and having a uniform thickness over the whole perimeter. SOLUTION: The insertion section flexible tube 30 used for an endoscope is composed of a heat-shrinkable tube 310, a shell 320, a mesh-like tube 330, and a spiral tube 340. The insertion section flexible tube 30 molded with the shell 320 is inserted into the heat-shrinkable tube 310, and heated at a predetermined temperature. By the heating, the heat-shrinkable tube 310 shrinks and restrains the shell 320. By the heating and the restraint, the surface of the shell 320 melts, and unevenness is removed. At the same time, the bias of the shell thickness which is generated by the melting of the surface of the shell 320 is prevented. Thus, the insertion section flexible tube 30 having a smooth surface and a circular cross section of which the thickness is uniform over the whole perimeter can be obtained. COPYRIGHT: (C)2007,JPO&INPIT
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