The present invention provides a stent assembly for expanding a bodily passage in a patient and draining a fluid therefrom. The assembly comprises at least one expandable stent and an elongated carrier for delivery or retrieval of the stent. The stent is circumferentially attached to a distal end of the carrier. The carrier defines at least two concentric lumens therethrough, a drainage lumen in fluid communication with the bodily passage for drainage of the fluid and an inflation lumen in fluid communication with the expandable stent. The invention also provides a method of expanding a bodily passage in a patient and draining a fluid therefrom. The method comprises providing a stent assembly of the present invention; inserting a guidewire into the bodily passage through the drainage lumen of the carrier; advancing the assembly along the guidewire until the assembly reaches a desired location; expanding the stent; and draining the fluid through drainage lumen of the carrier.