Endovascular graft for aneurysms involving major branch vessels

1. An endovascular system for deployment at branched arteries comprising: a main tubular graft deployable within a main artery comprising:

a proximal open end, an opposed open distal end and a circumferential sealing member disposed at a location near the proximal end, defining a proximal graft collar portion disposed between the proximal end of the graft and the circumferential sealing member; and

an anchoring member securably attached to the proximal graft collar portion, wherein at least a portion of the anchoring member is disposed beyond the proximal end of the main graft; and

a vent device deployable within a branch artery branched from the main artery comprising a main body having an open end and an opposed proximal end, the proximal end comprising a terminal open-cage, lattice structure having an atraumatic end radially extending across said proximal end and forming an apex;

wherein, in a deployed configuration of the system, the graft collar portion is configured to cover or occlude at least a portion of the branch artery, and

wherein, in the deployed configuration of the system, the apex of the atraumatic end of the open-cage, lattice structure pushes the graft collar away from a wall of the main artery to provide fluid communication for blood flow from the main artery through the vent device and into the branch artery, and

wherein the vent device is a discrete structure and separate from the main tubular graft.

2. The endovascular system of claim 1 wherein the main tubular graft is an inflatable graft and the circumferential sealing member is a circumferential inflatable cuff.

3. The system of claim 1 , wherein the atraumatic end pushes the graft collar along a direction axial to the main body of the vent device.

4. The system of claim 1 , wherein the vent device comprises at least two wires curved at an apex to define the atraumatic end.

5. The system of claim 4 , wherein the at least two wires intersect at the apex.

6. The system of claim 1 , wherein the vent device comprises a stent-graft portion.

7. A method for providing blood flow at branched arteries comprising: providing a main tubular graft deployable within a main artery, the main tubular graft

comprising:

a proximal open end, an opposed open distal end and a circumferential sealing member disposed at a location near the proximal end, defining a proximal graft collar portion disposed between the proximal end of the graft and the circumferential sealing member; and

an anchoring member securably attached to the proximal graft collar portion, wherein at least a portion of the anchoring member is disposed beyond the proximal end of the main graft;

providing a vent device deployable within a branch artery branched from the main artery, the vent device comprising:

a main body having an open and an opposed proximal end, the proximal end comprising an open-cage lattice structure having an atraumatic end radially extending across said proximal end and forming an apex;

deploying the vent device within the branch artery;

deploying the main graft within the main artery such that the graft collar portion covers or occludes at least a portion of the branch artery and further such that the atraumatic end of the open-cage lattice structure pushes the graft collar away from a wall of the main artery to provide fluid communication for blood flow from the main artery through the vent device and into the branch artery

wherein the vent device is a discrete structure and separate from the main tubular graft.

8. The method of claim 7 wherein the main tubular graft is an inflatable graft and the circumferential sealing member is a circumferential inflatable cuff.

9. The method of claim 7 wherein the open-cage lattice structure of the vent device comprises at least two wires.

10. The method of claim 9 wherein the at least two wires are curved at an apex, the apex defining the atraumatic end.

11. An endovascular system for deployment at branched arteries comprising: a main tubular graft deployable within a branched main artery comprising:

a proximal open end, an opposed open distal end and a circumferential sealing member disposed at a location near the proximal end, defining a proximal graft collar portion disposed between the proximal end of the graft and the circumferential sealing member; and

an anchoring member securably attached to the proximal graft collar portion, wherein at least a portion of the anchoring member is disposed beyond the proximal end of the main graft; and

a vent device deployable within a branch artery branched from the main artery comprising a main body having a stent-graft portion, an open end and an opposed proximal end the proximal end comprising an open-cage, lattice structure and an atraumatic end formed from the intersection of at least two wires each radially extending across the proximal end;

wherein in a deployed configuration of the system, the proximal end of the main tubular graft is configured to span a branch of the main artery, and

wherein in the deployed configuration the proximal end of the main tubular graft receives the atraumatic end of the vent device, such that the atraumatic end of the vent device pushes the graft collar away from a wall of the main artery to provide fluid communication for blood flow from the main artery through the vent device and into the branch artery,

wherein the vent device is a discrete structure and separate from the main tubular graft.

12. The system of claim 11 , wherein, when the main graft is deployed within the main artery, the graft collar portion is configured to cover or occlude at least a portion of the branch artery.

13. The system of claim 11 , wherein the main tubular graft is an inflatable graft.

14. The system of claim 11 , wherein the circumferential sealing member is a circumferential inflatable cuff.

15. The system of claim 11 , wherein the main graft further comprises a stent.