The endoscope insertion tube includes a spiral tube, a braided mesh on the outside of the spiral tube, and a plastic layer. The insertion tube also includes a rigid wire, which is arranged at one end of the insertion tube close to the operating unit. The hardness of the insertion tube near the end of the operating part is higher than that of the insertion tube near the curved end. The rigid wire is embedded in the insertion tube. The main factor in this setting is that the operation department can advance the endoscope insertion tube into the lumen along the way, reducing the patient’s pain.
There are 5 aspects to judge the quality of the endoscope insertion tube：