3E1-Faqih S,Shamsuddin AB, Chakrabarti A,et al. Polyurethane internal ureteral stents in treatment of stone patients:morbidity related to indwelling times[J]. J Urol, 1991,146(6) : 1487-1491.
8DAMIANO R, OLIVA A, ESPOSITO C, et al. Early and late complications of double piatail ureteral stent[J]. Urol Int, 2002, 69(2): 136-140.
9RIEDL CR, WITKOWSK1 M, PLAS E, et al. Heparin coating reduces encrustation of ureteral stents: a preliminary report[J]. Int J Antimicrob Agent, 2002, 19(6): 507-510.
