An intravascular stent having a stent body and at least one cover overlying the stent body to cover the first portion of the stent body. The cover has a first region attached to the stent body and a second region unattached to the stent body. Multiple covers can be attached to the stent body in overlapping arrangement, each cover having a free unattached end. The free ends reduce the overall stiffness of the stent.
1. A method of treating a vessel of a patient comprising:
deploying a first stent across an opening in a vessel; and
subsequently inserting within the first stent, a second stent including:
a frame;
a first cover configured such that the first cover extends across the opening in the vessel, the first cover having a first end attached to the frame and a second free end unattached to the frame; and
a second cover having an attached end and a free end, the free end of the first cover overlying the attached end of the second cover,
wherein insertion of the second stent within the first stent pins the first cover and the second cover between the first stent and the second stent.
2. The method according to claim 1 , wherein the first stent is composed of a woven material and the second stent is composed of an expandable material and movable from a collapsed condition to an expanded condition to facilitate expansion of the first stent within the second stent.
3. The method according to claim 1 , wherein the second stent is composed of a non-woven material.
4. The method according to claim 1 , wherein the first cover is attached to an outer wall of the second stent.
5. The method according to claim 1 , wherein the second stent is composed of a woven material.
6. The method according to claim 1 , wherein a porosity of the second stent is greater than a porosity of the first stent.
7. The method according to claim 6 , wherein the second stent has a porosity of greater than about 80%.
8. The method according to claim 1 , wherein the first and second stents are delivered through an end hole in a delivery catheter.
9. The method according to claim 1 , wherein the first stent is composed of a first material and the second stent is composed of a second different material.
10. The method according to claim 1 , further comprising hydrogel adhered to one or more of the first stent, second stent or first cover, the hydrogel swellable to fill a gap in the first cover.
11. The method according to claim 1 , wherein treating the vessel includes preventing an endoleak.
12. The method according to claim 1 , wherein inserting the second stent includes inserting the second stent with the frame extending continuously between a proximal end and a distal end of the second stent.
13. A method of treating a vessel of a patient comprising:
deploying a first stent across an opening in a vessel; and
subsequently inserting a second stent within the first stent, wherein the second stent includes:
a frame;
a first cover having a first end attached to the frame and a second free end unattached to the frame, the first cover configured to extend across the opening in the vessel, the first cover being impermeable to blood; and
a second cover having an attached end and a free end, the free end of the first cover overlying the attached end of the second cover,
wherein insertion of the second stent within the first stent pins the first cover and the second cover between the first stent and the second stent.
14. The method according to claim 13 , wherein a porosity of the second stent is greater than a porosity of the first stent.
15. The method according to claim 13 , wherein the first stent is composed of a first material and the second stent is composed of a second different material.
16. The method according to claim 13 , further comprising hydrogel adhered to one or more of the first stent, second stent or first cover, the hydrogel swellable to fill a gap in the first cover.
17. The method according to claim 13 , wherein inserting the second stent includes inserting the second stent with the frame extending continuously between a proximal end and a distal end of the second stent.
18. The method according to claim 13 , wherein the second cover is impermeable to blood.
19. The method of claim 13 , wherein treating the vessel includes preventing an endoleak.
20. The method of claim 13 , wherein the second stent further comprises a third cover.