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AND OBJECTIVES: We designed a novel technique of suctioning flexible ureteroscopy with automatic control of renal pelvic pressure (RPP) by a patented system including a pressuremeasuring ureteral access sheath (UAS) and an irrigation and suctioning platform. We sought to compare RPP values measured by the irrigation and suctioning platform and a nephrostomy catheter at different phases of flexible ureteroscopy when flow rate was set at 100 mL/min. METHODS: Eight young female pigs with a total of 16 macroscopically normal upper urinary tract systems were included .Via a subcostal incision a 6-F catheter was placed into the renal pelvis for RPP measurement by connecting to a pressure monitor. We then introduced the patented UAS (12-15F) retrogradely into the renal pelvis, through which the pressure was measured by the platform. RPP was measured at baseline period, irrigation and suctioning period, and therapeutic period. RESULTS: Twelve renal pelves were successfully established animal models for flexible ureteroscopy and pressure-measuring. Baseline RPP was 26.9 3.8mm Hg in the platform group and 26.3 5.2mm Hg in the nephrostomy group ( p 1⁄4 0.44). There was no significant difference on RPP between the 2 pressure measuring methods either at irrigation and suctioning period (-5.21+/-2.11 vs. -3.59+/-1.45, p1⁄40.42) or therapeutic period (-5.81+/-2.47 vs. -3.73+/-2.19, p1⁄40.39). CONCLUSIONS: Renal pelvic pressure can be accurately and effectively monitored and controlled using the irrigation and suctioning platform with function of pressure feedback and suctioning UAS with function of pressure-measuring.

MP58-15 SUCTIONING FLEXIBLE URETEROSCOPY WITH AUTOMATIC CONTROL OF RENAL PELVIC PRESSURE: A PORCINE MODEL