A medical system comprises a fluid supply reservoir and an elongate body fluidly connected to the fluid supply reservoir. The elongate body has a first end and a second end opposite the first end. The elongate body is sized and configured to be passable through a patient's stomach and small intestine. The elongate body includes a plurality of lumens. The plurality of lumens comprise two or more outer inflatable lumens configured to transition between a non-inflated state and an inflated state; and a feed lumen disposed between the outer lumens.