Two Types of Single-use Flexible Ureteroscopies for the Treatment of Upper Urinary Tract Stones in Children

The single-use digital flexible Ureteroscopy (fURS) is commonly used for the treatment of upper urinary tract stones. The size of the outer diameter of the fURS can affect the safety, efficacy, and medical costs of the treatment. Particularly for children, their ureters are thinner and more tortuous compared to adults, which places higher demands on medical devices. The investigators are interested in determining if the performance of the two different sizes of fURS (6.3 Fr vs. 8.6 Fr) are equivalent. This study will have guiding significance for the selection of upper urinary tract stones surgery in children in the future.