Inflatable intraluminal graft
View Patent ↗A collapsible stent graft for aortic aneurysms includes a collapsible inner tubular member ( 26 ) and an outer layer ( 24 ) fused or adhered thereto such as to provide a spiral inflatable member ( 22 ) therebetween. The stent graft is inserted into an artery in the collapsed state and then expanded into position by introducing a liquid into the inflatable member and sealing the member. The graft is held in place by an expandable stent ( 40 ).
1. A collapsible stent graft for lining a blood vessel comprising:
a collapsible inner tubular member having a proximal and a distal end and comprising expanded PTFE;
an outer sleeve layer co-extensive with the inner tubular member and having a proximal and a distal end and comprising PTFE and disposed around the inner tubular member, the distal end of the outer layer being fused to the distal end of the inner tubular member, the proximal end of the outer layer being fused to the proximal end of the inner tubular member, and the outer layer attached to the inner tubular member at localized attachment points so as to define an inflatable member extending around the inner tubular member in a plurality of turns and attached thereto, wherein the inflatable member is expandable by inflation so that the inflatable member expands the inner tubular member from a collapsed state to an expanded state;
a metallic stent disposed at the distal or proximal end of the fused collapsible inner tubular member and the fused outer sleeve layer;
an inflation tube integrally formed between the outer sleeve layer and the inner tubular member for inflating the inflatable member; and
hooks disposed on the metallic stent, the hooks being distal from the inflatable member.
2. The stent graft of claim 1 , wherein said outer layer further comprises a thrombogenic material.
3. The stent graft of claim 2 , wherein the thrombogenic material is selected from the group consisting of a collagen, a polysaccharide, and a blood clotting factor.
4. The stent graft of claim 3 , wherein the thrombogenic material is the blood clotting factor.
5. The stent graft of claim 4 , wherein the blood clotting factor is thrombin or fibrinogen.
6. The stent graft of claim 1 , wherein the inflatable member forms a spiral structure around the tubular member.
7. The stent graft of claim 1 , further comprising a spacing of 1 or 2 mm between adjacent turns.
8. The stent graft of claim 1 , comprising a plurality of inflatable members.
9. The stent graft of claim 1 , wherein the inflatable member comprises a zig-zag or square-wave pattern.
10. The stent graft of claim 1 , comprising perforations distal from the inflatable member to allow tissue ingrowth thereinto.
11. The stent graft of claim 1 , wherein the tubular member has a wall thickness thinner than 0.2 mm.
12. The stent graft of claim 1 , wherein an end of the inner tubular member is of undulating shape.
13. The stent graft of claim 1 , wherein an end of the inner tubular member is angled.
14. The stent graft of claim 1 , wherein the inner tubular member is bifurcated.
15. The stent graft of claim 1 , further comprising a liquid for inflation of the inflatable member.
16. The stent graft of claim 15 , wherein the liquid solidifies after injection into the inflatable member.
17. The stent graft of claim 16 , wherein the solidified liquid adheres to the inside walls of the inflatable member.
18. The stent graft of claim 1 , wherein the inner tubular member comprises expanded PTFE film having a microstructure selected from the group consisting of uni-axially oriented fibrils, bi-axially oriented fibrils, or multi-axially oriented fibrils.
19. A collapsible stent graft for lining a blood vessel comprising:
a collapsible inner tubular member having a proximal and a distal end and comprising a material of expanded PTFE;
an outer sleeve layer having a proximal and a distal end and comprising a material different from the material of the inner tubular member and disposed around the inner tubular member, the distal end of the outer layer being fused to the distal end of the inner tubular member, the proximal end of the outer layer being fused to the proximal end of the inner tubular member, and the outer layer attached to the inner tubular member at localized attachment points so as to define an inflatable member extending around the inner tubular member in a plurality of turns and attached thereto, wherein the inflatable member is expandable by inflation so that the inflatable member expands the inner tubular member from a collapsed state to an expanded state;
a metallic stent disposed at the distal or proximal end of the fused collapsible inner tubular member and the fused outer sleeve layer; and
hooks disposed on the metallic stent, the hooks being distal from the inflatable member;
wherein the material for the outer sleeve layer comprises PTFE.
20. The stent graft of claim 19 , wherein the material for the outer sleeve layer has a greater strength to resist tearing than the material for the inner tubular member.
21. The stent graft of claim 19 , wherein said outer sleeve layer further comprises a coating of a thrombogenic material.
22. The stent graft of claim 21 , wherein the thrombogenic material is selected from the group consisting of a collagen, a polysaccharide, and a blood clotting factor.
23. The stent graft of claim 22 , wherein the thrombogenic material is the blood clotting factor.
24. The stent graft of claim 23 , wherein the blood clotting factor is thrombin or fibrinogen.
25. The stent graft of claim 19 , comprising a plurality of inflatable members.
26. The stent graft of claim 19 , wherein the tubular member has a wall thickness thinner than 0.2 mm.
27. The stent graft of claim 19 , wherein the inner tubular member is bifurcated.
28. The stent graft of claim 19 , further comprising a liquid for inflation of the inflatable member.
29. The stent graft of claim 28 , wherein the liquid solidifies after injection into the inflatable member.