Abstract: An endovascular stent, including: a guide portion and a drive portion; a plurality of flexible support arms, each including two opposing ends that are coupled to said guide portion and said drive portion respectively, said arms being moveable relative to each other between an expanded position and a compressed position; and said stent including at least one barrier portion, such that when said arms are moved to said expanded position, said arms configure the barrier portion into a selectively permeable barrier through which one or more articles may be introduced into a space between said barrier and a wall of a lumen receiving said stent.