Percutaneous nephrolithotripsy with pneumatic and ultrasonic power under B-type ultrasound guidance for treatment of large and complex calculi

Objective:To evaluate the efficacy combined pneumatic and ultrasound lithotripsy under ultrasound guidance during percutaneous nephrolithotripsy.Methods:From March 2006 to June 2008,96 renal units of 90 patients of large and complex renal calculi underwent percutaneous nephrolithotripsy using a combined pneumatic and ultrasound lithotripsy.Clinical data was analyzed retrospectively.Results:The average time for whole surgery was 70 min and the time for complete stone clearance was 50 min.The stone clearance rate 92% and 7 cases had a residual stone smaller than 1.5 cm due to inaccessible location.No severe complication occurred duing nephrolithotripsy after 1 to 6 month fellow up.Conclusions:The combined pneumatic and ultrasonic device appears to be efficacious and safe for disintegrating and removing large and complex renal calculi under B-type ultrasound guidancd.