Objective To perform benchtop experiments using direct in‐scope suction (DISS) ureteroscopes (Pusen Medical, Zhuhai, China; 3.6‐Ch and 5.1‐Ch working channels) and flexible and navigable suction (FANS) ureteric access sheaths (ClearPetra; Wellead, Guangzhou, China) to establish their ability to clear stones of different diameters. Methods For each experimental group, we conducted a series of experiments using mixes of progressively larger stone particles (250 μm and >500 μm (with 3.6‐Ch and 5.1‐Ch working channels) may block the ureteroscope. The use of FANS, through successful clearance of larger fragments, may facilitate clearance of larger fragments.
Menzies‐Wilson et al. (Tue,) studied this question.