Endovascular graft joint and method for manufacture
View Patent ↗A joint and method for producing a joint in an endovascular graft. In one embodiment, a flap of a flexible material portion of an endovascular graft is folded about a portion of an expandable member to form a loop portion. The flap is secured in the loop configuration so that tensile force on the expandable member is transferred into a shear force on the fixed portion of the flap.
1. An endovascular graft or section thereof comprising:
a flexible material portion and a transversely oriented member secured to the flexible material portion with a joint that includes at least one flap formed from a partially removed section of the flexible material portion folded back about the transversely oriented member to form a loop portion there around, the partially removed section creating a void in the flexible material portion, the flap further extending beyond the transversely oriented member and secured to the flexible material portion to form a secured portion thereat, the flexible material portion and the flap having opposed outside and inside surfaces;
an outer layer of flexible material disposed over the outside surfaces of the flap and the flexible material portion, including said void formed in the flexible material portion; and
an inner layer of flexible material disposed over inside surfaces of the flap and the flexible material portion, including said void formed in the flexible material portion.
2. The endovascular graft or section thereof of claim 1 wherein the flexible material portion of the endovascular graft comprises ePTFE.
3. The endovascular graft or section thereof of claim 1 wherein the outer layer of flexible material of the endovascular graft comprises ePTFE.
4. The endovascular graft or section thereof of claim 1 wherein the inner layer of flexible material of the endovascular graft comprises ePTFE.
5. The endovascular graft or section thereof of claim 1 wherein the flexible material portion further comprises a plurality of layers and the flap is formed of a layer that is secured to itself.
6. The endovascular graft or section thereof of claim 1 wherein the transversely oriented member comprises a material having high strength relative to the strength of the flexible material portion.
7. The endovascular graft or section thereof of claim 6 wherein the transversely oriented member comprises nickel titanium.
8. The endovascular graft or section thereof of claim 1 wherein the flap is secured by bonding with an adhesive to the flexible material portion of the graft or section thereof.
9. The endovascular graft or section thereof of claim 8 wherein the adhesive is selected from the group comprising FEP and PFA.
10. The endovascular graft or section thereof of claim 1 wherein the flexible material portion comprises fusible material and the flap is secured by thermomechanical compaction of the flap and a portion of the fusible material in contact with the flap.
11. The endovascular graft or section thereof of claim 10 wherein the fusible material comprises ePTFE.
12. The endovascular graft or section thereof of claim 11 wherein the ePTFE has a thickness of about 0.001 to about 0.01 inch.
13. The endovascular graft or section thereof of claim 11 wherein the ePTFE is sintered.
14. The endovascular graft or section thereof of claim 1 wherein the flexible material portion further comprises a plurality of layers and the flap is formed of a layer that is secured to another layer.
15. The endovascular graft or section thereof of claim 1 wherein the at least one flap is about 1 to about 25 square millimeters.
16. The endovascular graft or section thereof of claim 1 wherein the joint comprises a plurality of flaps of flexible material folded back and secured to form loop portions about the transversely oriented member.
17. The endovascular graft or section thereof of claim 1 wherein the joint comprises about 2 to about 24 flaps of flexible material folded back and secured to form loop portions about the transversely oriented member.
18. The endovascular graft or section thereof of claim 1 wherein the transversely oriented member comprises a circumferentially oriented member.
19. The endovascular graft or section thereof of claim 1 wherein the transversely oriented member comprises a connector member or portion thereof.
20. The endovascular graft or section thereof of claim 1 wherein the transversely oriented member comprises an expandable stent or portion thereof.
21. The endovascular graft or section thereof of claim 20 wherein the expandable stent comprises a self-expanding stent.
22. The endovascular graft or section thereof of claim 1 wherein the flap of the flexible material portion is configured to transfer tensile force on the transversely oriented member into a shear component of force on the flap and on the flexible material portion.
23. The endovascular graft or section thereof of claim 1 wherein a surface area of the secured portion of the flap is large relative to a surface area of the transversely oriented member.
24. An endovascular graft or section thereof comprising:
a flexible material portion and a transversely oriented member secured to the flexible material portion with a joint that includes at least one flap formed from a partially removed section of the flexible material portion folded back about the transversely oriented member to form a loop portion there around, the partially removed section creating a void in the flexible material portion, the flap further extending beyond the transversely oriented member and secured to the flexible material portion to form a secured portion thereat, the flexible material portion and the flap having opposed outside and inside surfaces;
an outer layer of flexible material disposed over the outside surfaces of the flap and the flexible material portion, including said void formed in the flexible material portion;
an inner layer of flexible material disposed over inside surfaces of the flap and the flexible material portion, including said void formed in the flexible material portion; and
an inflatable channel disposed between the outer layer of flexible material and the inner layer of flexible material at a graft section beyond the flap.
25. An endovascular graft or section thereof comprising:
a flexible material portion having at least two cuts and a transversely oriented member secured to the flexible material portion with a joint that includes at least one flap formed from said flexible material portion having said at least two cuts, wherein said at least one flap is folded back about the transversely oriented member to form a loop portion there around, the folded-back portion of the flap creating a void in the flexible material portion, the flap further extending beyond the transversely oriented member and secured to the flexible material portion to form a secured portion thereat, the flexible material portion and the flap having opposed outside and inside surfaces;
an outer layer of flexible material disposed over the outside surfaces of the flap and the flexible material portion, including said void formed in the flexible material portion; and
an inner layer of flexible material disposed over inside surfaces of the flap and the flexible material portion, including said void formed in the flexible material portion.