To evaluate the efficacy, safety and operating skills of Sun's tip-flexible ureterorenoscopy(tf-URS) with holmium laser in the treatment of renal and upper ureteral calculi.

Retrospective analysis of clinical data of 82 patients with renal and upper ureteral calculi were treated with tf-URS with holmium laser in our hospital, including 52 male (63.4%) and 30 female (36.6%), and 26 cases with upper ureteral calculi(31.7%), 56 cases with renal calculi(68.3%). The age ranged from (37±11) years old. Stone size was (1.4±0.6) cm. All the patients were diagnosed by ultrasound, CT or IVP. The operative time, postoperative complications and calculi clearance rate were observed.

The success rate of insertion of tf-URS was 95.1% (78/82) in the first time. Four patients suffered ureterostenosis or ureteral distortion was changed to laparoscopy or PCNL. The success rate of lithotripsy was 97.4%(76/78) . The rate of total stone clearance was 96.1%(73/76) at 4 weeks, and 3 cases underwent ESWL. No serious complications occurred.

The tf-URS with holmium laser in the treatment of renal and upper ureteral calculi is safe, reliable and it has high success rate with low incidence of complications.