ouble-J ureteral stents are commonly used to bypass obstruction and alleviate pain in acute obstruction as well as in preparations prior to endoscopic stone treatment, or to stent the ureterovesical anastomosis after kidney transplantation to avoid obstruction due to edema in the early postoperative phase. In spite of various material upgrades and design modifications, encrustation remains a major problem causing stent associated complications with a significant impact on patients’ quality of life . Encrusted stents can become blocked and cause obstructive pyelonephritis. Foreign bodies in the urinary tract also tend to be colonized by bacteria that cause urinary tract infections. Severely encrusted stents can no longer be retrieved endoscopically and require more invasive approaches to be removed. As a result, indwelling stents have to be replaced in regular intervals. For stone patients, indwelling times longer than six weeks have been associated with significantly higher encrustation rates . For transplant patients, indwelling times from two to six weeks after transplantation have been recommended based on urinary tract infection (UTI) rates and stent-related complications such as pain, hematuria, encrustation and migration .