Single-Use Olympus Double Layer Biliary Stents feature a unique construction, with a different material in each layer. The inner layer has a water repellent property that minimizes bile adhesion. The more rigid material of the outer surface provides the stiffness necessary to facilitate smooth insertion. The double layer design eliminates flap and side holes to prevent bile accumulation in the stent lumen. Four flaps at both the distal and duodenal ends ensure secure placement in the bile duct and help to confirm position during stent placement. The stents are available in both proximal bend and center bend designs in a wide variety of lengths.