Modular stent graft systems and methods with inflatable fill structures

1. A method comprising:

inserting a first delivery catheter into an aneurysm, wherein the delivery catheter comprises a first stent graft and an inflatable fill structure fixed to a portion of an outside surface of the first stent graft, and wherein the first stent graft has a first end and a second end;

deploying the first stent graft in the aneurysm; and

filling the inflatable fill structure with a fill medium, wherein a portion of the inflatable fill structure is configured to extend from a position confined between the first and second ends of the first stent graft when in an unfilled state to beyond at least one of the first end of the first stent graft or the second end of the first stent graft when the inflatable fill structure is in a filled state.

2. The method of claim 1 , further comprising:

inserting a second delivery catheter into the aneurysm, wherein the second delivery catheter comprises a second stent graft with a first end and a second end and

deploying the second stent graft in the aneurysm,

wherein a portion of the first stent graft surrounds a first portion of the second stent graft.

3. The method of claim 2 , wherein the portion of the inflatable fill structure is configured to extend over a second portion of the second stent graft when the inflatable fill structure is in a filled state.

4. The method of claim 3 , wherein the first portion of the second stent graft is adjacent to the second portion of the second stent graft.

5. The method of claim 2 , wherein the portion of the inflatable fill structure is configured to expand beyond the first end of the first stent graft when the inflatable fill structure is in a filled state, and wherein the portion of the first stent graft that surrounds the first portion of the second stent graft is on the first end of the first stent graft.

6. The method of claim 1 , wherein the second end of the first stent graft comprises a first lumen and a second lumen.

7. The method of claim 6 , wherein said deploying the first stent graft comprises inserting the first lumen into a first blood vessel and inserting the second lumen into a second blood vessel.

8. The method of claim 6 , further comprising:

inserting a second delivery catheter into the aneurysm, wherein the second delivery catheter comprises a second stent graft with a first end and a second end; and

deploying the second stent graft in the aneurysm, wherein a portion of the first lumen surrounds a portion of the second stent graft.

9. The method of claim 8 , wherein the portion of the inflatable fill structure that is configured to extend beyond an end of the first stent graft is further configured to extend over the second stent graft.

10. The method of claim 6 , further comprising:

inserting a third delivery catheter into the aneurysm, wherein the third delivery catheter comprises a third stent graft with a first end and a second end; and

deploying the third stent graft in the aneurysm, wherein a portion of the second lumen surrounds a portion of the third stent graft.

11. The method of claim 10 , wherein the portion of the inflatable fill structure that is configured to extend beyond an end of the first stent graft is further configured to extend over the second stent graft and the third stent graft.

12. A method comprising:

inserting a delivery catheter into an aneurysm, wherein the delivery catheter comprises

an inflatable fill structure, comprising an inside surface; and

a stent graft, and wherein the inflatable fill structure is fixed to a portion of an outside surface of the stent graft;

deploying the inflatable fill structure into the aneurysm;

filling the inflatable fill structure with a fill medium to a first pressure such that the fill structure confined between a first and a second end of the stent graft in an uninflated state expands beyond an end of the stent graft; and

monitoring movement of the inside surface of the inflatable fill structure.

13. The method of claim 12 , wherein the inside surface of the inflatable fill structure comprises a radiopaque material.

14. The method of claim 13 , wherein the radiopaque material comprises at least two markers located on opposite sides of the inflatable fill structure.

15. The method of claim 14 , wherein the at least two markers are not located over another radiopaque material.

16. The method of claim 13 , wherein the radiopaque material comprises a first expandable scaffold.

17. The method of claim 16 , wherein the inflatable fill structure comprises a second expandable scaffold, wherein a radial force of the first expandable scaffold is less than a radial force of the second expandable scaffold.

18. The method of claim 13 , wherein said monitoring movement of the inside surface of the inflatable fill wherein comprises monitoring movement of the radiopaque material via an x-ray machine or a magnetic resonance imaging machine.

19. The method of claim 12 , wherein the movement of the inside surface of the inflatable fill structure is caused by a difference in blood pressure within a lumen formed by the inside surface of the inflatable fill structure.