A Comparative Study Between the Usage of Flexible and Navigable Suction Ureteral Access Sheath Versus Traditional Access Sheath in Retrograde Intrarenal Surgeries

Inclusion Criteria: * Age ≥14 years old in patients not known to have stone forming medical conditions. * Renal stones diameter of ≤2 cm confirmed by CT with all types of configurations (branching \& non-branching). * Non - recurrent cases with no history of previous open renal surgeries or PCNL with normal renal anatomy. * Patients with non - infected urine analysis. Exclusion Criteria: * Patients with abnormal urinary tract anatomy (such as horseshoe kidney or ileal conduit). * Patients with medical conditions promoting stone formation (hyperparathyroidism - gout). * Patients with history of stones on the same side with previous open surgical intervention or PCNL . * Patients with e-GFR \< 60 ml / min. * Patients with uncontrolled urinary tract infection. * Patients with health or other factors that are absolute contraindications to RIRS. * Patients who are unable to understand or complete trial documentation.