Comparing Super Pulse Fiber Thulium Laser and Holmium Laser for Ureteral Stone Fragmentation During Ureteroscopy

Inclusion Criteria: * Age ≥18 years old * Diagnosis of kidney stones and/or upper ureteral stones with stone diameter ≥6mm and ≤20mm * Plan to undergo fURS lithotripsy * General anesthesia to complete the operation * The latest urine culture before surgery is negative * Signed and dated informed consent indicating that the patient or his or her legal representative has been fully informed about the study and has consented to participate Exclusion Criteria: * Isolated kidney * Previous history of kidney transplantation or urinary diversion surgery * Congenital malformations of urinary system * Abnormal coagulation mechanism due to blood system diseases, liver diseases, etc. * Severe heart or lung disease, malignancy and immune deficiency status * Neurogenic bladder * Failure to provide informed consent * Have an untreated urinary tract infection * The presence of known anatomic abnormalities (such as ureteral stenosis), urothelial tumors, or stones that can be removed directly without the use of laser lithotripsy * Pregnant women * In cases where the stone cannot be reached with a bendable negative pressure suction sheath, or in cases where the stone cannot be reached with a conventional sheath or the pyeloureteral junction * Surgical completion under epidural anesthesia or lumbar anesthesia * Recurrent stones due to genetic metabolic diseases