Procedures of Sotn ureterorenoscopy. A – (①, ②) Scheme of stone dust removal by the suctioning system through interspace between the shaft of the console ureterorenoscope and modified UAS. B – (①, ②) Comparison of preoperative and postoperative conditions of renal stones. C – Sotn ureterorenoscopy. D – Surgery scheme.. (page 789)