ObjectiveTo investigate the method and therapeutic effect of B ultrasound guided minipercutaneous nephrolithotomy(MPCNL)in the treatment of upper urinary tract stones. MethodOne hundred and twenty cases of upper urinary tract were treated with B ultrasound guided MPCNL, among them, 50 were renal staghorn and multiple stones, 38 were single pelvis and single calyceal stones, 18 were bilateral renal calculus, and 14 were upper ureteral calculi. ResultsOf all 120 patients, 118 were performed with MPCNL successfully ,among which, 95 (including 5 cases dual path mPNL) were eradicated the stone in the first time, and 23 in the second time; and the other 2 were transformed to open surgery for kidney puncture. Nineteen of 120 cases with residual stone were prescribed with extracorporeal shock wave lithotripsy or the observational treatment, and the overall stone clearance rate was 82.5% (99/120). The average operation time was (90±20 )min, the average hospital stay was (10±2) day, the average nephrostomy tube retention time was (4±1) days, and the average retention time of double J tube was 4 weeks. Eight cases appeared bleeding during the postoperative week, among them, 3 cases needed transfusion, 5 cases developed urinary extravasation; and 7 cases had postoperative fever (＞39℃). No other complication like hemopneumothorax, abdominal organ injury,or nephrectomy occurred. ConclusionB ultrasound guided MPCNL is an excellent microinvasive method for upper urinary tract stone, with advantages of less trauma, less pain, quicker recovery, shorter hospital stay, high stone clearance, fewer complications, etc.

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