透视下插入纤维结肠镜的最大缺点是玻璃纤维易于变色,术者、病人都必然接受相当的X线量,所以在无射线透视下插入结肠镜是最理想的,但操作比较困难,因此,必须研究其插入方法。关于这个问题首先要熟练掌握基本方法,其次要学会通过乙状结肠和过长的横结肠下垂部。我们认为在插镜过程中通过乙状结肠或过长的横结肠下垂部困难较大。如果施术者能顺利的通过上述二个部位,那么其他部位就迎刃而解了。通过乙状结肠我们不用α-翻 The biggest disadvantage of inserting a fiber colonoscope under fluoroscopy is that the glass fiber is prone to discoloration, and both the surgeon and the patient must receive a considerable X-ray volume. Therefore, it is ideal to insert a colonoscope without fluoroscopy, but it is difficult to operate. Therefore, it must be Study its insertion method. First, master the basic methods on this issue, and secondly, learn to pass the sigmoid colon and the long transverse colon sagging. We believe that it is more difficult to pass through the sigmoid colon or the long transverse colon in the insertion process. If the surgeon can successfully pass through the above two parts, the other parts will be solved. Through the sigmoid we do not use α-turn