Kuchumov Aleksei Gennadevich Russia Perm State National Research Polytechnical University, Russia, 614990, Perm, Komsomolskii av., 29 kychymov@inbox.ru Author's articles Investigation of surface roughness at micro-scale and mechanical response in the contemporary bio-polimer sutures by the nanoindentation The conformal contact between punches and coated solids with complicated surface profile Mathematical Modeling of Deposits Accumulation on the Plastic Biliary Stent Surface for Predicting Its Occlusion