Participation in an Investigational Study within 90 days prior to date of patient consent

Strictures that cannot be dilated enough to pass the delivery system

Perforation of any duct within the biliary tree

Presence of a metal biliary stent

Presence of any esophageal or duodenal stent

Patients for whom endoscopic procedures are contraindicated

Patients with known sensitivity to any components of the stent or delivery system

Patients with active hepatitis or intrahepatic metastases that extensively involves both lobes of the liver

Patients with an anticipated life expectancy of \< 3 months

A Study of the WallFlex™ Biliary Fully-covered Stent for the Palliative Treatment of Malignant Bile Duct Obstruction