BLOOMINGTON, Ind.--(BUSINESS WIRE)--The results of a 16-month clinical study showing that the Cook Medical Resonance Metallic Ureteral Stent could remain in a patient for up to 12 months; generating a 43 percent cost savings in treating benign ureteral obstruction, will be presented by Dr. Thomas M. Turk, a member of the study’s investigative team, during a press conference at the 2009 AUA Conference in Chicago on April 27. These results are compared to alternative polymer stent treatment methods which may require more frequent stent changes throughout the year.