Double-branching ascending aortic stent-graft systems

A method comprising:

• providing a main stent-graft, which is configured to assume a radially-compressed delivery state and a radially-expanded deployment state, and which includes:
• a flexible main-stent-graft stent member and a generally tubular main fluid flow guide, which (a) is securely attached to and covers at least a portion of the main-stent-graft stent member, and (b) is shaped so as to define proximal and distal main-fluid-flow guide end openings, a main fluid flow lumen therebetween, and a main-fluid-flow guide lateral opening;
• and
• an internal support channel, which (a) is configured to assume expanded and collapsed states, (b) is disposed within the main fluid flow guide, (c) includes a generally tubular channel fluid flow guide, which is shaped so as to define (1) proximal and distal channel-fluid-flow guide end openings and (2) when the internal support channel is in the expanded state, a channel lumen between the proximal and the distal channel-fluid-flow guide end openings,
• wherein the proximal channel-fluid-flow guide end opening is sealingly coupled to a perimeter of the main-fluid-flow guide lateral opening, such that the channel lumen is in fluid communication with outside the main fluid flow guide via the main-fluid-flow guide lateral opening when the internal support channel is in the expanded state;
• providing an elongate member that is removably positioned passing sequentially through (a) the proximal main-fluid-flow guide end opening, (b) a longitudinal portion of the main fluid flow lumen, (c) the distal channel-fluid-flow guide end opening, and (d) the main-fluid-flow guide lateral opening to outside the main fluid flow lumen;
• introducing the main stent-graft into vasculature of a patient while (a) the main stent-graft is in the radially-compressed delivery state, and (b) the internal support channel is in the collapsed state, in which the distal channel-fluid-flow guide end opening faces radially inward;
• and
• thereafter, transitioning the main stent-graft to the radially-expanded deployment state,
• wherein the internal support channel is configured to automatically transition to the expanded state when not constrained in the collapsed state by the main stent-graft and not constrained in the collapsed state by the elongate member, and wherein when the internal support channel is in the expanded state, the distal channel-fluid-flow guide end opening faces at least partially distally within the main fluid flow guide.

A method comprising:

• endovascularly introducing a vascular implant into vasculature of a patient through vascular access site that is downstream of a first branch of an aortic arch;
• thereafter, advancing the vascular implant through the first branch to the aortic arch;
• thereafter, advancing the vascular implant from the aortic arch at least partially into a second branch of the aortic arch;
• and
• thereafter, deploying the vascular implant at least partially in the second branch.

A method comprising:

• deploying a guidewire between (i) a first vascular access site that is downstream of first branch of an aortic arch of a patient and (ii) a second vascular access site that is downstream of a second branch of the aortic arch, such that the guidewire is positioned partially within the first branch, partially within the aortic arch, and partially within the second branch;
• advancing a vascular implant over the guidewire;
• and
• deploying the vascular implant within vasculature of the patient.