Abstract
Remarkable advances in fiberoptics and its insertion technique have made it possible to observe all parts of the colon mucosa. On the other hand, several new approaches to perform colonoscopy with more ease, safety and exactitude have been discussed. One of the most difficult points during colonoscopy is to straighten the sigmoid colon which tends to make a large loop. In order to keep the sigmoid colon in a straight position, a sliding tube made of plastics was devised and it has been widely used in colonoscopy . However, it has been desired to perform colonoscopy without any subsidiary instruments. Thus colonoscope, type CF-VS (Olympus), which has a van-stiffness in its insertion tube was devised. During the last 3 months, 75 cases were examined with this colonoscope . Changing the stiffness of the insertion tube during the insertion, all cases were exanined with ease without marking a large loop formation in the sigmoid colon . Therefore, CF-VS is useful as an improved scope to examine the whole parts of the colon .
