An expandable tubular stent for implantation in a body lumen, the stent comprising: a structural portion extending along a longitudinal axis and having a delivery diameter length and an expanded diameter length along the axis; and a barrier portion affixed to the structural portion, the barrier portion being at least partially made of metal, the barrier portion having a delivery diameter length and an expanded diameter length along the axis; the structural portion expanded diameter length being within the relative range of 1% to 25% of the barrier portion expanded diameter length, wherein: the barrier portion has a plurality of pores extending therethrough, the plurality of pores having pore sizes within a range of greater than 40 μ m to 3,000 μ m, wherein the structural portion is radially expandable about the axis and has an expanded percentage open area, the structural portion including a plurality of struts, wherein, the barrier portion is radially expandable about the axis and has an expanded percentage open area, the barrier portion including a plurality of pores extending therethrough, and wherein the stent has a composite expanded percentage open area within a range of 65% to 95%, wherein the composite expanded percentage open area is calculated by finding a difference between an area of the pores of the expanded barrier portion and an area of the pores occluded by the struts of the expanded structural portion, and dividing the difference by surface area of the expanded stent. a structural portion extending along a longitudinal axis and having a delivery diameter length and an expanded diameter length along the axis; and a barrier portion affixed to the structural portion, the barrier portion being at least partially made of metal, the barrier portion having a delivery diameter length and an expanded diameter length along the axis; the structural portion expanded diameter length being within the relative range of 1% to 25% of the barrier portion expanded diameter length, wherein: the barrier portion has a plurality of pores extending therethrough, the plurality of pores having pore sizes within a range of greater than 40 μ m to 3,000 μ m, wherein the structural portion is radially expandable about the axis and has an expanded percentage open area, the structural portion including a plurality of struts, wherein, the barrier portion is radially expandable about the axis and has an expanded percentage open area, the barrier portion including a plurality of pores extending therethrough, and wherein the stent has a composite expanded percentage open area within a range of 65% to 95%, wherein the composite expanded percentage open area is calculated by finding a difference between an area of the pores of the expanded barrier portion and an area of the pores occluded by the struts of the expanded structural portion, and dividing the difference by surface area of the expanded stent. the barrier portion has a plurality of pores extending therethrough, the plurality of pores having pore sizes within a range of greater than 40 μ m to 3,000 μ m, wherein the structural portion is radially expandable about the axis and has an expanded percentage open area, the structural portion including a plurality of struts, wherein, the barrier portion is radially expandable about the axis and has an expanded percentage open area, the barrier portion including a plurality of pores extending therethrough, and wherein the stent has a composite expanded percentage open area within a range of 65% to 95%, wherein the composite expanded percentage open area is calculated by finding a difference between an area of the pores of the expanded barrier portion and an area of the pores occluded by the struts of the expanded structural portion, and dividing the difference by surface area of the expanded stent.