Abstract:Objective?To evaluate the efficacy, advantages and shortcomings of micro-percutaneous nephrolithotomy in treatment of uncomplicated ureteral calculi.?Methods?Clinical data were collected from 126 patients with a failure treatment of history by ESWL (extracorporeal shock wave lithotripsy) and RIRS (retrograde intrarenal surgery) in treatment of upper ureteral calculi (< 3.0 cm) from June 2015 to May 2016. Antegrade percutaneous access was obtained by B-type ultrasound guidance. Micro-PCNL was done using YAG laser fiber or pneumatic through the ureteroscope (F4.5 ~ F6.5、F6.0 ~ F7.5, 315 mm) to disintegrate the stones. The calculi clearance rate, operation time, operative hemorrhage, length of hospital stay and complications of the patients were analyzed after operation. ?Results?The calculi clearance rate was 88.9%, the operation time was 15 ~ 75 min, the operative hemorrhage was 15 ~ 35 ml, the length of hospital stay was 5 ~ 10 d. Only one patient need the second stage surgery because of intraoperative hemorrhage affected the surgical field. No patients occurred massive hemorrhage, pneumothorax, bowel and other complications such as organ damage.?Conclusion?Micro-PCNL had a good clinical curative effect and security in treatment of uncomplicated ureteral calculi, which was worthy of promoting clinically.