Effect of Complete Suction-Induced Collapse of the Renal Collecting System at the End of RIRS on Early Postoperative Outcomes

Inclusion Criteria: * Patients aged 20 to 80 years. * Patients diagnosed with kidney stones and scheduled for retrograde intrarenal surgery (RIRS). * Patients who have voluntarily signed the written informed consent form Exclusion Criteria: * Participation in another clinical trial (drug or device) within 1 month prior to enrollment. * Congenital abnormalities of the urinary or reproductive system. * Presence of a pre-placed ureteral stent (pre-stenting) at the time of surgery. * Solitary kidney. * Uncontrolled urinary tract infection. * History of ureteral reconstruction on the affected side. * Pregnancy. * Uncorrectable bleeding diathesis or ongoing therapeutic anticoagulation therapy. * Contraindications to general anesthesia. * Other conditions that the investigator deems inappropriate for participation in the study.