Locked segments pushable stent-graft

An implantable prosthesis having a fully expanded configuration defining an expanded perimeter and a collapsed configuration defining a collapsed perimeter smaller than the expanded perimeter comprising:

• a generally tubular substrate defining a longitudinal axis;
• a scaffold disposed over the substrate including a series of longitudinally adjacent expandable rings formed of alternating struts;
• a plurality of support members extending between longitudinally adjacent expandable rings, each support member including a first element coupled to and extending from an apex formed at a connection between two adjacent struts of an expandable ring and a second element coupled to and extending from an apex formed at a connection between two adjacent struts of an adjacent expandable ring,
• wherein the first element comprises a first linear leg and a second linear leg and the second element comprising a third linear leg, and, in the collapsed configuration, the first linear leg, the second linear leg, and the third linear leg are parallel, terminal end regions of the first linear leg and the second linear leg contact along a common longitudinal length to define a linear element collinear to the second element such that terminal ends of the first element and the second element contact each other,
• wherein in the fully expanded configuration, the terminal end regions of the first linear leg and the second linear leg are separated circumferentially along the common longitudinal length to form oblique angles with the longitudinal axis, and the terminal ends of the first element and the second element do not contact,
• wherein the first linear leg and second linear leg originate from a common apex, inside lateral edges of the first linear leg and second linear leg are in contact in the collapsed configuration and out of contact in the expanded configuration, and one of the first element and second element includes a terminal distal end surface defining a detent and the other of the first element and second element includes a terminal distal end surface defining a shape configured to extend into the detent and form a friction fit therewith;
• the implantable prosthesis further comprising
• a plurality of circumferential bands, such bands bonded to the substrate at spaced apart locations, the bands positioned over an outer surface of the expandable rings such that the plurality of support members are substantially uncovered;
• one or more radiopaque markers positioned along the implantable prosthesis;
• and
• a bio-active agent coated onto a portion of the implantable prosthesis.