方法：对160例输尿管下段结石患者随机分成两组，每组80例。
Methods: 160 cases of ureteral Duan Jieshi patients randomly divided into two groups, 80 cases in each group.
结论经输尿管镜治疗单纯输尿管下段结石常规放置输尿管支架管是不必要的。
Conclusion Ureteroscopy for removing uncomplicated distal calculi is safe with no stent after treatment and routine use of ureteric stents is unnecessary.
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