[Design and materials for ureteral stents: past, present and future].

Ureteral stents have a long history of use. Their main goal is to provide effective drainage of the upper urinary tract. Morbidity is mostly related to low biocompatibility of materials, from which stents are made. Since stent introduction, there have been many stages of evolution and modernization. However, there is a significant problem associated with their widespread use. Despite technological progress, stent-associated symptoms, incrustation, bacterial infection are the problems that still have to be resolved while creating an "ideal" stent. The continued development of new materials and coatings also will lead to the improvement of such an indispensable urological device as the ureteral stent.