Small Intestinal Submucosa Graft for Repair of Anterior Urethral Strictures

Inclusion Criteria: * Patients signed informed consent form * Patients with a single, longer than 2.0 cm and shorter than or equal to 7.0 cm anterior urethral stricture * Patients undergoing substitution urethroplasty for urethral stricture. Exclusion Criteria: * Patients without surgical indication * Subtotal and total urethral strictures * Radiation therapy to the abdomen or pelvis * Lichen sclerosis related strictures * Patients with previous hypospadias repair * Neurogenic urinary tract disorders * Mental disorders * Patients with a known biologic sensitivity or a cultural aversion to the use of porcine materials. * Patients with severe dysfunction of heart, lung, liver, kidney and other important organs , endocrine system and blood system. * Patient with malignant tumor * Patient who cannot be regularly examined due to any circumstances * Any clinical state which does not ensure the safe implementation of study procedure (investigator's view)