In at least one embodiment, a stent comprises a plurality of interconnected framework members defining a plurality of cells. A side branch structure comprises a first serpentine ring extending around an inner side branch cell, a second serpentine ring extending around the first serpentine ring and a plurality of side branch connectors. The first serpentine ring comprises a plurality of curved portions including convex curved portions and concave curved portions. The convex curved portions include first convex curved portions and second convex curved portions, wherein the second convex curved portions are located farther away from a side branch center point than the first convex curved portions. Each side branch connector extends between a concave curved portion of the first serpentine ring and a portion of the second serpentine ring.
