Abstract:Objective To investigate the safety and efficacy of 5 F ureteral catheter negative suction assisted with 6/7.5 F ureteroscopic lithotripsy in treatment of ureteral calculus complicated with infection.Methods 67 patients with ureteral calculus complicated with infection were treated by 5 F ureteral catheter negative suction assisted with 6/7.5 F ureteroscopic lithotripsy from July 2020 to December 2021, all the patients had fever before operation. 5 F ureteral catheter was indwelled under the ureteroscope and passed over the stone during the operation, the end of the ureteral catheter was connected to negative pressure suction, 200 μm holmium laser was used to crush the calculus under negative pressure suction.Results There were 6 patients had fever after operation, including 4 cases of low fever ( < 38.5℃) and 2 cases of high fever (38.9℃ and 39.4℃). The postoperative infection rate was 9.0%. The ureteral double J stent was removed 2 to 4 weeks after operation. The postoperative stone clearance rate was 83.6%; All cases had no serious complications such as ureteral perforation, mucosal avulsion, and septic shock.Conclusion 5 F ureteral catheter negative suction assisted with 6/7.5 F ureteroscopic lithotripsy is safe and effective in the treatment of ureteral calculus complicated with infection, it can reduce the occurrence of postoperative infection and urosepsis.