New-generation flexible ureterorenoscopes are more durable than previous ones.

Objectives: To determine the deterioration in the maximal active deflection and flow capabilities of a new-generation flexible ureteroscope (URS).

Methods: We performed 50 ureterorenoscopies using the same URS: a Karl Storz 11278 AU1 Flex-X, which is capable of a 270 degree active deflection in the ventral and dorsal directions. Postoperatively, we evaluated the maximal active ventral and dorsal deflection, irrigation flow at 100 cm H2O, and the number of broken optical fibers.