The patented Tandem Architecture™ Stent Design Macro™ Elements, as well as other proximal connectors designed by Express SD, were made for durability and longevity, mainly in ostial lesions. This product was made to allow for elasticity during stent placement. During the RENAISSANCE Trial, a study designed to test the Express SD Renal Premounted Stent System as a means to treat atherosclerotic lesions in aortoneal osmium, found that these devices were extremely effective. In fact, this product has been award the "Best in Class Compression Resistance and continues to be highly recommended by the medical community as a whole.