Abstract: Objective To introduce the advantages of a kind of dual-channel ureteroscope in the treatment of holmium laser lithotripsy for upper ureteral calculi in children. Methods 80 cases with  unilateral ureteral calculi admitted to our hospital from April 2020 to December 2020 were retrospectively analyzed.40 patients in the experimental group were treated with pediatric dual-channel ureteroscopy for holmium laser lithotripsy,and other 40 patients in the control group were treated with conventional single-channel ureteroscopy for holmium laser lithotripsy.Compared  the success rate of ureteroscopy insertion,operation time,postoperative fever and other complications,escape rate and clearance rate of alculi. Result The ureteroscope was successfully inserted in all the patients of the experimental group(100% vs 77.5%),the difference was statistically significant(P＜0.05).Experimental calculi escape rate (2.5%) is far lower than the control group (32.5%), the difference was statistically significant(P＜0.05).Experimental operation time for (31.8±2.23) minutes, and the control group (48.6±3.71) minutes, the more similar between the two groups was statistically significant (P＜0.05). Experimental group of stone clearance rate (100%) than the control group (80%), difference was statistically significant (P＜0.05). Conclusion Dual-channel reteroscopy is simple in operation,with clear field of vision in the process of lithotripsy,short operation time,low stone escape rate,high lithotripsy efficiency,less postoperative complications,and low price.

Key words: Holmium laser lithotripsy, dual-channel reteroscope