Abstract:Objective To analyze the clinical efficacy and safety of N-Trap assisted ureteroscopic lithtripsy(nURL) in the treatment of hyper-upper ureteral calculi. Methods A retrospective analysis was performed on clinical data of 165 patients with unilateral ureteral hyper-upper ureteral calculi who received successful operation at Yancheng NO.1 People's Hospital from January 2017 to December 2020. The patients were divided into three groups according to the operation method, including nURL group (n=68), flexible ureteroscopic lithtripsy(fURL)group (n=43), and percutaneous nephrolithotomy(PCNL) group (n=55). The operation time, postoperative hospital stay, stone clearance rate and the occurrence of serious postoperative complications were compared among the three groups. Results The postoperative hospital stay and operation time in the PCNL group were longer than those in the fURL group and nURL group (P＜0.05). There was no significant difference in stone clearance rate and serious postoperative complications between 3 days after surgery and one month after surgery (P>0.05). Conclusion Compared with fURL and PCNL surgery, use of nURL to treat hyper-upper ureteral calculi can also achieve a good stone removal effect, and has a shorter operation time and postoperative hospital stay.