Stent-graft having facing side branch portals

1. A system for treating vascular disease, said system comprising:

a catheter;

a stent graft having at least two side branch portals, each side branch portal having a proximal end and a distal end, each distal end being substantially contiguous with an outer surface of the stent graft, the distal ends being generally axially further spaced apart than the proximal ends;

a constraining sleeve for constraining the stent graft onto an end of the catheter for endoluminal delivery of the stent graft; and

a guidewire tube that extends through the at least two side branch portals and preserves a lumen which guides a guidewire through the at least two side branch portals while the stent graft remains constrained by the constraining sleeve, wherein an end of the guidewire tube is closed to limit advancement of the guidewire therethrough while the guidewire tube extends through the at least two side branch portals of the constrained stent graft.

2. The device as set forth in claim 1 , wherein each side branch portal includes a longitudinal axis extending through the center point of its respective proximal end.

3. The device as set forth in claim 2 , wherein the longitudinal axes of the side branch portals are not co-axial.

4. The device as set forth in claim 3 , wherein the longitudinal axes of the side branch portals are substantially parallel.

5. The device as set forth in claim 3 , wherein the longitudinal axes of the side branch portals are generally parallel with a longitudinal axis of the stent graft.

6. The device as set forth in claim 2 , wherein the longitudinal axes of the side branch portals are generally aligned along a common plane.

7. The device as set forth in claim 1 , wherein at least one proximal end faces antegrade.

8. The device as set forth in claim 1 , wherein at least one proximal end faces retrograde.

9. The device as set forth in claim 1 , wherein one of the proximal ends faces antegrade and another of the proximal ends faces retrograde.

10. The device as set forth in claim 1 , wherein at least one side branch portal comprises a bifurcated configuration.

11. The device as set forth in claim 10 , wherein the side branch portal having the bifurcated configuration is generally T-shaped.

12. The device as set forth in claim 1 including a third side branch portal having a T-shaped configuration and being disposed between the proximal ends of the at least two side branch portals.

13. The device as set forth in claim 12 , wherein the at least two side branch portals are generally elbow-shaped.

14. The device as set forth in claim 1 , wherein at least one side branch portal is generally elbow-shaped.

15. The system as set forth in claim 1 , wherein the guidewire tube is removable after the guidewire is received therethrough.

16. The system as set forth in claim 1 , wherein opposite ends of the guidewire tube extend away from the stent graft through distinct slits in the constraining sleeve.

17. The system as set forth in claim 1 , further comprising one or more side branch stent grafts installed at the at least two side branch portals.

18. The system as set forth in claim 1 further comprising at least one side branch stent graft extending through at least one of the side branch portals for treating a branch vessel.

19. The system as set forth in claim 1 further comprising at least two side branch stent grafts extending respectively through the at least two side branch portals.

20. The system as set forth in claim 19 , wherein two of the at least two side branch stent grafts are interconnected.

21. The system as set forth in claim 1 , further comprising an extender installed at a proximal end of the stent graft.