The present invention relates to a self-expanding stent (150) comprising a flexible body having an unexpanded configuration and an expanded configuration, the expanded configuration including a proximal end of the body expanded into a proximal flange (152), a distal end of the body expanded into a distal flange (154), and a cylindrical region (151) between the proximal and distal flanges (152, 154), wherein at least the cylindrical region (151) is covered, the covered cylindrical region (151) having an open interior passage configured to permit the flow of fluid therethrough, the proximal and distal flanges (152, 154) each projecting away from the interior passage of the cylindrical region (151) to permit the flow of fluid therethrough, wherein the proximal flange (152) has an end portion (153) configured to bend back towards the distal flange (154), the distal flange (154) has an end portion (155) configured to bend back towards the proximal flange (152), and the stent configured to be retrievable from the expanded configuration within a patient.
