Stent with anti-migration features
Stents and/or endoluminal implants for extending across two non-adherent structures/tissues. An illustrative stent may comprise an elongated tubular body having a scaffolding forming a plurality of cells and a coating disposed over an outer surface of the elongated tubular body. The coating may comprise a first micro-porous layer and a macro-porous layer including a plurality of loops disposed over the micro-porous layer.
1 . A stent, comprising:
an elongated tubular body having a scaffolding forming a plurality of cells; and
a coating disposed over an outer surface of the elongated tubular body, the coating comprising:
a first micro-porous layer; and
a macro-porous layer disposed over the micro-porous layer.
2 . The stent of claim 1 , wherein the macro-porous layer includes a columnar structure.
3 . The stent of claim 1 , further comprising a second micro-porous layer disposed over the macro-porous layer.
4 . The stent of claim 1 , wherein the first micro-porous layer has interconnected pores in a range of about 0.05 micrometers to about 2 micrometers.
5 . The stent of claim 4 , wherein the macro-porous layer has a thickness in a range of at least 1 micron to at least one millimeter.
6 . The stent of claim 1 , wherein the first micro-porous layer has a thickness in a range of about 10 micrometers to about 80 micrometers.
7 . The stent of claim 6 , wherein the first micro-porous layer has interconnected pores in a range of about 0.05 micrometers to about 2 micrometers, and the macro-porous layer has a thickness in a range of at least 1 micron to at least one millimeter.
8 . A stent, comprising:
an elongated tubular body having a scaffolding forming a plurality of cells; and
a coating disposed over an outer surface of the elongated tubular body, the coating comprising:
a first micro-porous layer; and
a macro-porous layer disposed over the micro-porous layer;
wherein the macro-porous layer includes a plurality of loops.
9 . The stent of claim 8 , wherein the plurality of loops are stacked one on top of another to form a plurality of pillars.
10 . The stent of claim 9 , wherein the plurality of pillars extend radially from an outer surface of the first micro-porous layer.
11 . The stent of claim 9 , wherein at least some of the plurality of pillars have a longitudinal axis extending at an oblique angle to a longitudinal axis of the elongated tubular body.
12 . The stent of claim 9 , wherein at least some of the plurality of pillars have a free end that is oriented towards a longitudinally centrally located pillar.
13 . The stent of claim 9 , wherein a density of the plurality of pillars increases towards a longitudinally centrally located pillar.
14 . The stent of claim 8 , wherein a loop of the plurality of loops is at least partially laterally spaced from a preceding loop.
15 . The stent of claim 8 , wherein each loop of the plurality of loops includes a loop portion of a filament and an overlapping base portion of the filament.
16 . The stent of claim 15 , wherein the overlapping base portion includes a first segment of the filament that overlaps a second segment of the filament.
17 . The stent of claim 8 , wherein adjacent loops of the plurality of loops are free from contact with one another.
18 . The stent of claim 8 , wherein the macro-porous layer comprises one or more circumferentially extending rows of the plurality of loops.
19 . The stent of claim 8 , wherein the macro-porous layer comprises one or more longitudinally extending rows of the plurality of loops.
20 . The stent of claim 8 , wherein the macro-porous layer comprises a first layer and a second layer disposed over the first layer, each of the first and second layers comprising a plurality of rows of the plurality of loops.