To introduce the experience and clinical efficacy of a new type of negative pressure suction ureteroscope in the treatment of upper ureteral calculi, and compare it with traditional rigid ureteroscope and flexible ureteroscope lithotripsy.

From January 2018 to January 2020, 160 patients with upper ureteral incarcerated calculi who were treated in Shengjing Hospital Affiliated to China Medical University were included in this study, and their clinical data were retrospectively analyzed.There were 50 cases in the rigid ureteroscope group, 54 cases in the flexible ureteroscope group and 56 cases in the new negative pressure combined ureteroscope group.The differences of operation time, hospital stay, stone free rate and postoperative complications were observed and compared among the three groups.According to whether the maximum diameter of the stone is more than 1.5 cm, the subgroups were analyzed to further compare the curative effect of the three groups.

All the 160 operations were completed successfully and none of them were converted to open surgery.The stone free rate of the new negative pressure suction ureteroscope Group (90.0% (18/20))was higher than that of the flexible ureteroscope Group (61.9% (13/21)) and the rigid ureteroscope Group (55.6% (10/18)), χ ²=8.49, P<0.001). The stone free rate in the first month after operation was also superior (96.4% (54/56), 77.7% (42/54), 74.0% (37/50), χ²=5.48, P=0.01). The stone subgroup analysis showed that when the stone diameter increased (>1.5 cm), the net stone rate of the new negative pressure suction ureteroscope Group^{[91.6% (22 / 24)]} was better than that of the flexible ureteroscope Group (62.5% (15/24)) and the rigid ureteroscope Group (50.0 (8/16))(χ²=6.480, P=0.001).

Compared with the traditional ureteroscopic lithotripsy, the new negative pressure suction ureteroscopic lithotripsy has higher initial and overall stone free rate, and higher safety factor.For the patients with stone diameter>1.5 cm, the new negative pressure suction ureteroscope lithotripsy has more advantages.

Upper ureteral calculi; Ureteroscopic lithotripsy; Negative pressure suction; Curative effect