However, high perfusion rate leads to renal pelvic pressure increase, resulting in absorption of liquid, bacteria, and endotoxin into blood, followed by short-term complications such as systemic inflammatory response syndrome(SIRS , 8.1%), sepsis (0-4.5%), renal pelvic and ureteral tumor spread, and long-term complication of renal function impairment. Currently the commonly used flexible ureteroscope sheath (ureteral access sheath, UAS) reduces the renal pelvic pressure to a certain extent, but still can not control and monitor the renal pelvic pressure to reduce the incidence of complications, which, limit the clinical application of ureteroscopy.