To evaluate the clinical efficacy and safety of Sun's tip-flexible ureterorenoscopy(tf-URS) combined with holmium laser lithotripsy for treatment of kidney stone less than 2 cm.

The data of 58 cases with kidney stone treated by tf-URS were analyzed in our hospital from April 2016 to February 2017.There were 36 males and 22 females with a mean age of (37±11) years. Stone size was 0.9-2.0 cm. All the patients were diagnosed by color ultrasound, intravenous urography(IVU) or CT. The success-rate of endoscopic insertion,operation time, the success-rate of lithotripsy, clearance rate of calculi, postoperative complications, hospital stay and hospitalization expenses were observed.

The success rate of tf-URS insertion was 96.6%(56/58), The calculi were detected in 56 cases, and the procedures succeed in 53 of them (53/58, 91.4%). Two patients suffered ureterostenosis or ureteral distortion were changed to second surgery or PCNL. The average operation time was (44±9) min. 49 cases had stone clearance at 4 weeks after primary operation. No serious complication occurred.

The tf-URS with holmium laser for the treatment of kidney stone less than 2 cm is effective, safe, low incidence of complications and low cost, worthy of further application and promotion.