A Study of Balloon Dilatation for the Treatment of Benign Ureteral Stricture

Inclusion Criteria: * • Subject has provided informed consent and indicated a willingness to comply with study treatments * Subject is 18-70 yrs of age * Subject can be either male or female * Subject diagnosed with ureteral stricture or atresia by enhanced CTU, intravenous pyelography or retrograde pyelography; * Subject's ureteral stenosis length is ≤ 2cm (single or multiple segments) Exclusion Criteria: * • Subject has any congenital ureteral anatomical deformity, abdominal organ compression, oppression caused by malignant tumor metastasis * Subject has poor result after endoscopic balloon dilatation treatment * Subject has a GFR \<25% on the affected side of the kidney * Subject has an active urinary tract infection (e.g., cystitis, prostatitis, urethritis, etc.) * Subject has been diagnosed with a urethral stricture or bladder neck contracture * Subject has been diagnosed with a urinary tract infection related to stone obstruction within two weeks * Subject has severe hematuria that might blur the vision of the endoscopy * Subject is pregnant or in monthly period * Subject has coexistent disease like systemic disease, heart disease, lung disfuction or other diseases that could not tolerate the endoscopic surgery or anesthesia. * Subject has unadjusted diabetes or high blood pressure * Subject has a disorder of the coagulation cascade system that would put the subject at risk for intraoperative or postoperative bleeding * Subject is unab…