Endovascular stent graft

An endovascular stent graft comprising:

• a main stent graft body having at least one stent secured to graft material, the stent graft body having a main body section defining a lumen extending from a proximal end to a bifurcation, and further having an ipsilateral leg portion and a contralateral portion extending integrally from the main body section at the bifurcation to respective distal ends and defining respective lumens;
• a contralateral leg extension for being secured to the distal end of the contralateral portion;
• an attachment graft tube having proximal and distal end portions and defining a lumen therethrough and further including an attachment stent extending proximally from the proximal end portion, wherein the attachment graft tube is securable to the main stent graft body at an overlapping region, the attachment graft tube distal end portion being securable to and within the proximal end portion of the main stent graft body at the overlapping region by a friction fit generated by spring forces of a self-expanding stent within the attachment graft tube distal portion pressing radially outwardly against the expanded proximal end portion of the main stent graft body upon deployment;
• and
• an intragraft tube having proximal and distal end portions, wherein the intragraft tube is disposed within the lumen extending from the main body section of the main stent graft proximally into the lumen of the attachment graft tube, and the intragraft tube underlying, supporting and extending beyond the overlapping region, the intragraft tube being securable to both the main stent graft body and the attachment graft tube by a friction fit generated by spring forces of a plurality of self-expanding stents, respective ones of which are within at least the intragraft tube distal and proximal portions, pressing radially outwardly against the expanded proximal end portion of the main stent graft body and the expanded distal end portion of the attachment graft tube, upon deployment thereof.

The method of placing an endovascular stent graft in a vessel at a bifurcation thereof where branch vessels join the vessel, for treating an aneurysm thereat, comprising the steps of:

• placing a bifurcated main stent graft body in the aneurysm unattached to a wall of the vessel with a first leg portion in a first branch vessel;
• urging a bifurcation of the main stent graft body into a seated position against the bifurcation of the vessel to move a second leg portion in a second branch vessel;
• and
• deploying an attachment mechanism of the stent graft to attach to walls of the vessel beyond the aneurysm.

A method of placing an endovascular stent graft in a vessel at a bifurcation thereof where branch vessels join the vessel, for treating an aneurysm thereat, comprising the steps of:

• placing a bifurcated main stent graft body in the aneurysm unattached to a wall of the vessel with a first leg portion in a first branch vessel;
• urging a bifurcation of the main stent graft body into a seated position against the bifurcation of the vessel to move a second leg portion in a second branch vessel;
• and
• securing the stent graft to the vessel wall.

A delivery system for endovascular devices, comprising:

• a first sheath having a distal end and a proximal end and containing at least a first expandable device at a proximal end;
• a second sheath movable within the first sheath and having a respective distal end and a respective proximal end, the respective proximal end concluding distally of the first expandable device and containing a second expandable device;
• a first pusher associated with the first expandable device extending thereto within the first and second sheathes from a first proximal control pusher end exposed at the distal ends of the first and second sheathes;
• and
• a second pusher associated with the second expandable device extending thereto within the first and second sheathes from a second distal control pusher end exposed at the distal ends of the first and second sheathes.