Endobiliary stenting of the peripapillary tumor obstruction zone suggests the development of ascending cholangitis. Objective: To study the antireflux effect of biliary stenting as a factor in the prevention of cholangitis by forming an intraduodenal segment of a covered stent, the parameters of which are determined on the basis of a digital model. Materials and methods: Patients with peripapillary malignant neoplasm (42 control group, 23 main group) after implantation of self-expanding covered and uncovered endobiliary stents. We assessed the presence of reflux of duodenal contents into the biliary tree and the clinical picture of cholangitis, the stability of the stent position (presence of migration) and its destruction. Results: The analysis of the digital stent model showed that the optimal position is the transpapillary location of the covered self-expanding stent with an intraduodenal segment of 25–30 % of the total length. Conclusion: The use of an endobiliary covered self-expanding stent with a 25–30 % intraduodenal segment reduces the risk of developing reflux-associated cholangitis. At the same time, the required positional stability of the stent and its resistance to destruction are preserved.