Abstract:Abstract: Objective To investigate the efficacy and safety of short-term indwelling double J tube during operation of flexible ureteroscopy. Methods The patients were randomly divided into normal group (control group) and short-term group (experimental group). Each group was divided into 1 cm, 1.0 ~ 1.5 cm, 1.5 ~ 2.0 cm group, according to the maximum diameter of calculi, indwelling double J tube 2 and 1 week respectively. Preoperative statistics of the number of patients with hematuria and lower urinary tract irritation, and the number of patients taking antispasmodic drugs was gathered. Statistical data about the indwelling ureter sheath diameter, operation time, surgical complications, and stone clearance rate during the operation was statistically analyzed according to the stone size group. Results In patients with hematuria and urinary irritation symptoms, no significant difference in both groups, but the number of patients taking antispasmolytic drugs in experimental group was significantly more than that in control group. In both experimental group and control group, there was no significant difference in the usage rate of 12/14 F, 13/15 F ureter sheath diameter (P > 0.05), while the usage of the biggest 14/16 F ureter sheath diameter differ significantly (P < 0.05). In patients with 1.0 cm and 1.0 ~ 1.5 cm calculi, there was no significant difference in average operation time, surgical complications and stone clearance rate in both groups (P > 0.05). However, in patients with 1.5 ~ 2.0 cm calculi, there was significant difference with average operation time and stone clearance rate in both groups (P < 0.05). One month after the operation, the results of the ultrasound showed that the calculi residual rate in experimental group was higher than that in control group, and there was no significant difference with the complications in the two groups (P > 0.05). Conclusion It is safe and effective to choose short-term indwelling double J tube since less uncomfortable symptoms occur and there is no significant adverse impact during the operation of ureteroscopic lithotripsy. But for the relatively complex and large stones (>1.5 cm), it should be in accordance with the normal time indwelling double J tube.