Devices and methods for approximating the cross-sectional profile of vasculature having branches

An implantable endovascular system comprising:

• a first elongated segment having a first end and a second end opposite the first end, the first elongated segment defining a first primary lumen extending between the first and second ends, and the first elongated segment comprising a first subsegment and a second subsegment, the first and second subsegments of the first elongated segment being separately insertable into a body lumen and joinable together during subsequent deployment in the body lumen;
• and
• a second elongated segment having a first end and a second end opposite the first end, the second elongated segment defining a second primary lumen extending between the first and second ends, and the second elongated segment comprising a first subsegment and a second subsegment, the first and second subsegments of the second elongated segment being separately insertable into the body lumen,
• wherein the first and second elongated segments are implantable laterally adjacent with one another such that a cross section of the first elongated segment and a cross-section of the second elongated segment are configured to be positioned adjacent to one another to form a combined cross-section that is substantially conformable to an intraluminal cross section of the body lumen, wherein the second subsegment of the first elongated segment and the second subsegment of the second elongated segment are each configured to be positioned independently relative to each other;
• and
• wherein the first and second elongate segments are implantable in a longitudinally displaced configuration from one another such that the first end of the first elongated segment is longitudinally offset from the first end of the second elongated segment.