Some embodiments are directed to a stent graft comprising a first stent graft having a first and a second stent and a first and a second inner graft supported by the first stent, and an outer graft. The second inner graft can be spaced apart from the first inner graft so that a portion of the first stent is not covered by either the first inner graft or the second inner graft. A first and second portion of the outer graft can be attached to the first stent, the outer graft being unsupported by the stent between the first and second portions so as to form a fillable space between the outer graft, the first inner graft, and the second inner graft. Some embodiments further comprise a second stent graft deployable within the inside of the first stent graft to sealingly cover the uncovered portion of the first stent.
1. A method of treating a segment of a blood vessel with stent grafts, comprising:
positioning a first stent graft across the segment of the blood vessel to be treated, the first stent graft having a first stent, an inner graft having a first portion and a second portion, and an outer graft;
wherein:
the second portion of the inner graft is spaced apart from the first portion of the inner graft so that a portion of the first stent is uncovered by the inner graft; and
a first portion and a second portion of the outer graft are attached to at least one of the first stent and the inner graft, the outer graft being unsupported by the first stent or inner graft between the first and second portions of the outer graft so as to create a fillable space between the outer graft and the inner graft;
allowing the space between the inner graft and the outer graft to fill through the uncovered portion of the stent with blood so that the outer graft expands outwardly away from the inner graft; and
deploying a second stent graft inside the first stent graft so as to sealingly cover the uncovered portion of the first stent graft, the second stent graft having a second stent and a second graft.
2. The method of claim 1 , wherein the outer graft supports one or more radiopaque markers thereon.
3. The method of claim 1 , further comprising monitoring a level of inflation of the outer graft before deploying the second stent graft inside the first stent graft.
4. The method of claim 1 , wherein the second stent graft has a length that is greater than a length of the uncovered portion of the first stent.
5. The method of claim 1 , wherein blood fills the space between the inner graft and the outer graft when the first stent graft is positioned in the blood vessel.
6. The method of claim 1 , further comprising allowing the blood to thrombose in the space after placement of the first stent graft.
7. The method of claim 1 , wherein the outer graft expands outwardly against an inside surface of the blood vessel.
8. The method of claim 1 , wherein the first stent graft is bifurcated.
9. The method of claim 1 , wherein the outer graft expands outwardly away from the inner graft and covers an ostium to a branch vessel.