| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an insertion section of an endoscope which achieves variations in flexibility of a flexible tube without depending on the characteristic of a resin forming an outer cover and without increasing filling factor of the inside of the flexible tube. <P>SOLUTION: A coil 25, whose cross-sectional shape perpendicular to a wire axis G1 of a wire 51 differs between a distal part 52 and a proximal part 53, is arranged inside the flexible tube of the insertion section. A cross-sectional secondary moment around an axis J2 at the proximal part 53 is larger than a cross-sectional secondary moment around an axis J1 at the distal part 52. With such a configuration, deflectionδ2 of the wire 51 at the proximal part 53 in the longitudinal direction of the flexible tube is smaller than deflectionδ1 of the wire 51 at the distal part 52 in the longitudinal direction of the flexible tube. As a result, flexibility of the proximal part of the flexible tube is smaller than that of the distal part of the flexible tube. When bending the flexible tube, the distal part of the flexible tube is easy to bend and the proximal part of the flexible tube is difficult to bend. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
