Safety and Efficacy of URS Stents in the Treatment of Ureteral Stricture

Inclusion Criteria: 1. Benign diseases: UPJ, ischemic injury caused by surgical separation, endoscopic surgery injury, heat injury by laser lithotripsy, infection (chronic inflammation, tuberculosis), peri-ureteral fibrosis caused by endometriosis, ureteral anastomotic stenosis after renal transplantation, ureteral fistula, multiple polyps; 2. Malignant diseases: ureteral anastomotic stricture after urinary diversion, stricture caused by compression of abdominal and/or pelvic tumors, stricture caused by urinary tract tumors, stricture caused by radiotherapy for colon or cervical cancer, ureteral fistula Exclusion Criteria: 1. Combine with hypertonic neurogenic bladder (except for patients with long-term indwelling catheter) 2. Colon resection surgery patients -