Taguchi K, et al. - The intention of the authors was to detect the perioperative factors exerting an impact on the flexible ureteroscope durability. The findings disclosed that lithotrite use and surgeon concern correlated with the degree loss of scope upward flexion. The use of a ureteral access sheath (UAS), absence of a safety guidewire, and the loss of upward ureteroscope flexion ought to be taken into account during the analysis of the means of optimizing reusable ureteroscope durability.