Abstract: Objective To compare the efficacy and safety of built-in 4F ureteral catheter and built-in 5F ureteral catheter combined with holmium laser lithotripsy in the treatment of ureteral calculus.Methods The clinical data of 68 calculus patients treated in our hospital from January 2020 to March 2021 were collected.Two groups were divided according to the different diameters built into ureteroscope,32 patients underwent ureteroscope built-in 4F ureteral catheter drainage lithotripsy (4F group),and 36 patients underwent ureteroscope built-in 5F ureteral catheter drainage lithotripsy (5F group).The perioperative results,calculus removal rate,and postoperative complication rate were compared between the two groups.Results The highest renal pelvic pressure(21.5±3.0)mmHg in the 5F group were lower than those in the 4F group(24.3±3.9)mmHg,ureteral catheter drainage temperature(26.4±2.9)℃，were lower than those in the 4F group(31.3±3.6)℃,number of tube blockages(2.1±0.3)were lower than those in the 4F group(2.9±0.5),and maximum calculus displacement distance(1.6±0.3)cm were lower than those in the 4F group(2.2±0.4cm),and the differences between the two groups were statistically significant (P<0.05).However,there was no statistical difference in operation time,calculus removal rate,and fever rate between the two groups (P>0.05).There was no ureteral perforation or mucosal avulsion in both groups after operation.Conclusion The ureteroscopy built-in 5F ureteral catheter and built-in 4F ureteral catheter lithotripsy are safe and effective for the treatment of ureteral calculus.However,the built-in 5F ureteral catheter can reduce the maximum intraoperative renal pelvic pressure and the temperature of the ureteral catheter drainage fluid,and reduce the distance of the calculus moving up.

Key words: built-in ureteral catheter, different diameters, ureteroscope