A Prospective Multicenter Randomized Controlled Trial of Flexible And Navigable Suction Ureteral Access Sheath Combined With Needle Perc for the Treatment of Partial Staghorn Renal Calculi

​ Conditions: Urinary Calculi Interventions: Procedure: Performed flexible and navigable suction ureteral access sheath combined with needle perc; Procedure: PCNL Sponsors: Beijing Tsinghua Chang Gung Hospital Not yet recruiting Conditions: Urinary Calculi...