Stent graft having movable fenestrated tubular bridge

1. A stent graft comprising:

an elongate main tubular body of a biocompatible graft material, the main tubular body comprising a main lumen, a distal end and a proximal end; and

an elongate tubular bridge of a biocompatible graft material and having an inner lumen, the elongate tubular bridge extending around a portion of the main tubular body and forming a bridging lumen bridging between two circumferentially spaced-apart openings within the main tubular body, the tubular bridge comprising at least two fenestrations, wherein the elongate tubular main body does not extend within the lumen.

2. The stent graft as claimed in claim 1 wherein the tubular bridge comprises concertinaed graft material.

3. The stent graft as claimed in claim 2 wherein the concertinaed graft material comprises a plurality of circumferential crimps.

4. The stent graft as claimed in claim 3 wherein a first sub-set of the circumferential crimps project outwards radially.

5. The stent graft as claimed in claim 4 wherein a second sub-set of the circumferential crimps project inwards radially.

6. The stent graft as claimed in claim 2 wherein the tubular bridge comprises at least three fenestrations.

7. The stent graft as claimed in claim 1 wherein the tubular bridge comprises first and second end portions joined by an intermediate portion, the first and second end portions located within the main tubular body.

8. The stent graft as claimed in claim 7 wherein the first end portion terminates in an opening, the opening comprising a reinforcing end ring.

9. The stent graft as claimed in claim 8 wherein the reinforcing end ring is attached to the graft material of the main tubular body.

10. The stent graft as claimed in claim 9 wherein the reinforcing end ring is D-shaped.

11. The stent graft as claimed in claim 10 wherein the D-shaped reinforcing end ring comprises a relatively straight portion joining ends of a C-shaped portion,

wherein the relatively straight portion is attached to the graft material of the main tubular body such that the relatively straight portion closely follows a portion of the circumference of the main tubular body.

12. A stent graft comprising:

an elongate main tubular body of a biocompatible graft material, the main tubular body comprising a main lumen, a distal end and a proximal end; and

an elongate tubular bridge of a biocompatible graft material, the elongate tubular bridge extending around a portion of the main tubular body and forming a bridging lumen bridging between two circumferentially spaced-apart openings within the main tubular body, the tubular bridge comprising at least two fenestrations, wherein the tubular bridge comprises first and second end portions joined by an intermediate portion, the first and second end portions located within the main tubular body, and wherein the first end portion comprises a first longitudinal support wire.

13. The stent graft as claimed in claim 12 wherein the second end portion comprises a second longitudinal support wire.

14. The stent graft as claimed in claim 1 comprising a plurality of self-expanding Z-stents disposed around the main tubular body.

15. A stent graft assembly comprising:

an elongate main tubular body of a biocompatible graft material, the main tubular body comprising a main lumen, a distal end and a proximal end;

an elongate tubular bridge of a biocompatible graft material, the elongate tubular bridge extending around a portion of the main tubular body and forming a bridging lumen bridging between two circumferentially spaced-apart openings within the main tubular body, the tubular bridge comprising at least two fenestrations; and

a peripheral stent graft, the peripheral stent graft having a first portion within the tubular bridge and a second portion extending from one of the at least two fenestrations,

whereby the first portion forms a blood flow barrier within the tubular bridge.

16. The stent graft assembly as claimed in claim 15 wherein the tubular bridge comprises concertinaed graft material.

17. The stent graft assembly as claimed in claim 16 wherein the concertinaed graft material comprises a plurality of circumferential crimps.

18. The stent graft assembly as claimed in claim 17 wherein a first sub-set of the circumferential crimps project outwards radially.

19. The stent graft assembly as claimed in claim 18 wherein a second sub-set of the circumferential crimps project inwards radially.

20. The stent graft assembly as claimed in claim 16 wherein the tubular bridge comprises at least three fenestrations.

21. A stent graft comprising:

an elongate main tubular body of a biocompatible graft material, the main tubular body comprising a main lumen, a distal end and a proximal end; and

an elongate tubular bridge of a biocompatible graft material having a first open end, a second open end, and a side wall of graft material between the first and second open ends, the elongate tubular bridge extending around a portion of the main tubular body and forming a bridging lumen bridging between two circumferentially spaced-apart openings within the main tubular body, the tubular bridge comprising at least two fenestrations in the side wall between the first and second open ends.