Systems and methods for maintaining perfusion of branch vessels

1. An endoluminal prosthesis comprising:

a graft having a tubular body comprising inflow and outflow ends, inner and outer surfaces, and partially and fully deployed states;

a temporary channel disposed external to the outer surface of the graft in the partially deployed state, the temporary channel beginning at the outflow end of the graft, and extending along only a portion of a longitudinal length of the graft, and terminating before the inflow end of the graft,

wherein the temporary channel is removed when the graft is in the fully deployed state, and

at least one fenestration disposed in a sidewall of the graft between the inflow and outflow ends of the graft, wherein the temporary channel is aligned with the fenestration.

2. The prosthesis of claim 1 , wherein the temporary channel comprises a “U”-shape.

3. The prosthesis of claim 1 further comprising a valve replacement disposed between the inflow and outflow ends of the graft.

4. The prosthesis of claim 1 , wherein a shape of the temporary channel is maintained by securement of a first portion of the graft to a second portion of the graft.

5. The prosthesis of claim 4 wherein the first portion of the graft is secured to the second portion of the graft using at least one suture.

6. The prosthesis of claim 5 wherein the temporary channel is removed by breaking the suture using an external force.

7. The prosthesis of claim 1 , wherein a shape of the temporary channel is maintained by securement of a portion of the graft to a delivery system.

8. The prosthesis of claim 7 further comprising a coupling member secured to the graft, and a wire extending along the delivery system, wherein the temporary channel is maintained when the wire is coupled to the coupling member of the graft, and wherein the temporary channel is removed when the wire is released from engagement with the graft.

9. The prosthesis of claim 1 , wherein the temporary channel comprises a sheath having an aperture, wherein the aperture is disposed distal to the distal end of the graft in the partially deployed state, and a portion of the sheath is disposed adjacent to the outer surface of the graft in the partially deployed state.

10. An endoluminal deployment system comprising:

a delivery device comprising a proximal end and a distal end;

a graft having a tubular body comprising inflow and outflow ends, inner and outer surfaces, and partially and fully deployed states, and an inner lumen configured to facilitate fluid flow substantially in an antegrade direction;

a temporary channel comprising inflow and outflow ends, the temporary channel disposed external to the outer surface of the graft in the partially deployed state, the temporary channel beginning at the outflow end of the graft, and extending along only a portion of a longitudinal length of the graft; and wherein the temporary channel is configured to receive fluid flow substantially in a retrograde direction,

wherein the inflow end of the temporary channel is further away from the proximal end of the delivery device than the outflow end of the temporary channel,

wherein the inner lumen of the graft is configured to facilitate fluid flow substantially in the antegrade direction through a main vessel, and wherein the temporary channel is configured to facilitate fluid flow substantially in the retrograde direction and into a branch vessel that branches off from the main vessel.

11. The deployment system of claim 10 , wherein the temporary channel is removed when the graft is in the fully deployed state.

12. The deployment system of claim 10 , further comprising at least one fenestration disposed in a sidewall of the graft between the inflow and outflow ends of the graft, wherein an inflow end of the temporary channel is aligned with the fenestration.

13. The deployment system of claim 10 , wherein the temporary channel comprises a “U”-shape.

14. The deployment system of claim 10 , wherein a shape of the temporary channel is maintained by securement of a first portion of the graft to a second portion of the graft.

15. The deployment system of claim 10 , wherein a shape of the temporary channel is maintained by securement of a portion of the graft to a delivery system.

16. The deployment system of claim 10 , further comprising a valve replacement disposed within at least a portion of the graft.

17. An endoluminal prosthesis comprising:

a graft having a tubular body comprising proximal and distal ends, inner and outer surfaces, and partially and fully deployed states;

a temporary channel disposed external to the outer surface of the graft in the partially deployed state, the temporary channel beginning at one of the proximal and distal ends of the graft, and extending along only a portion of a longitudinal length of the graft, wherein the temporary channel is removed when the graft is in the fully deployed state;

wherein a shape of the temporary channel is maintained by securement of a first portion of the graft to a second portion of the graft;

wherein the first portion of the graft is secured to the second portion of the graft using at least one suture; and

wherein the suture comprises a biodegradable material, and the temporary channel is removed upon degradation of the suture.

18. An endoluminal prosthesis comprising:

a graft having a tubular body comprising proximal and distal ends, inner and outer surfaces, and partially and fully deployed states;

a temporary channel disposed external to the outer surface of the graft in the partially deployed state, the temporary channel beginning at one of the proximal and distal ends of the graft, and extending along only a portion of a longitudinal length of the graft, wherein the temporary channel is removed when the graft is in the fully deployed state;

wherein the temporary channel comprises a removable stent framework disposed exterior to the graft in the partially deployed state.