Objective To investigate the effectiveness of the double casing pipe combined with suction technology in Phase I treatment of calculus pyonephrosis guided by nephroscope .Methods Using one -step method to puncture and establish 20F percutaneous nephrolithotomy channel for 36 patients those who suffered fromcalculus renal abscess guided by ultrasound , and Phase I treated calculus pyonephrosis by using double casing pipe combined with suction technology .Results 20F percutaneous nephrolithotomy channel for all patients were established successfully , phase one treat were done , the operative time was 30~90min, 45 min on average;none severe bleeding and septic shock and other complications occurred;4-5 days after the treatment KUB plain sheets and color doppler ultrasound were reviewed , 29 patients(80.55%,29/36) were stones free after a the treatment , and 7 cases with residual stones (19.45%,7/36).Conclusions The application of double casing pipe combined with suction technology was effectivein Phase I treatment of calculus pyonephrosis , for it could keep lowone pressure during the treatment and could avoid the spread of infection .%目的：探讨双套管结合负压吸引经皮肾镜I期治疗结石性脓肾的有效性。方法36例结石性脓肾患者均采用超声定位引导穿刺，一步法建立20 F经皮肾镜通道，经皮肾镜联合使用双套管结合负压吸引技术I期处理结石性脓肾。结果均成功建立20F经皮肾镜通道，行Ⅰ期碎石，手术时间为30～90 min，平均为45 min；未出现严重出血及感染性休克等并发症；术后4～5天复查KUB平片及彩超，29例患者结石一次性取净80．55％（29/36），结石残留7例（19．45％，7/36）。结论采用双套管结合负压吸引技术经皮肾镜取石术I期治疗结石性脓肾能保证碎石过程低压或者无压力，有效避免碎石过程中感染播散，是一种治疗结石性脓肾安全有效的方法。
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