Abstract: Objective To evaluate the feasibility and efficacy of the dual ultrasonic lithotriptor system combined with multi-point puncture standard channels technique in patients with renal staghorn calculi.Methods Analysis was made in 268 renal staghorn calculi patients, males 148,females 120,average age 18- 68 years old.Coupled with water collection systems (including the expansion of a kidney)accounted for 186 cases,pyometra amounted to 26 cases.All the patients were treated with dual ultrasonic lithotriptor system combined with multi-point puncture standard channels technique.General anesthesia or peridural anesthesia(in the two stage procedure)was applied.The standard channels,the punctures of renal pelvis and calyces were created under the color Doppler ultrasound guide.Results A total of 270 standard channels,486 point punctures of renal pelvis and calyces were made in the 268 patients.Among them,19 patients treated with 4 punctures,27 patients created with 3 punctures,107 patients created with 2 punctures,115 patients created with 1 puncture.The mean calculi removal time was 45.4 minutes. One-stage calculi clearance rate was 96.6%(259/268).Two-stage calculi clearance rate was 98.9%(265/268).Nine patients needed blood transfusion (3.4%).Interventional therapy technique was deployed in four patients (1.5%).Twenty-six patients complained postoperative fever (9.7%).No deaths occurred.There were no nephrectomy cases.Conclusion Dual ultrasonic lithotriptor system combined with multi-point puncture standard channels technique guided by color Doppler ultrasound in patients with renal staghorn calculi is safe and effective in quickly removal of calculi,also reducing the complications.

Key words: kidney calculi, nepmostomy percutaneous, lithotripsy