Abstract:
In this study, the influences of different lubricant media (lidocaine hydrochloride, saline, artificial saliva and artificial gastric juice) on the anti-friction effect between gastroscopic wound tube and esophageal mucosa were investigated by simulating the process of the front-end of endoscope passing into the esophagus. The results show that there was a typical stick-slip friction state between the gastroscopic wound tube and the esophageal mucosa interface. The frictional force was composed of adhesive component and deformation component. The lubricant medium can change the adhesion state by improving the wettability of the wound tube-esophageal mucosa interface. The lubricating effects of different lubricant media were related to their physical properties. Lidocaine hydrochloride can improve the wettability of the interface due to its small contact angle, surface free energy and adhesion work with the wound tube, and thus reduced the interfacial frictional resistance and friction coefficient, while artificial gastric juice had the opposite effect. The results can provide a theoretical basis for the development of lubricant medium and endoscopic wound tube in gastroscopic diagnosis and treatment.