Stent with protruding branch portion for bifurcated vessels

A stent comprising:

• a plurality of interconnected framework members defining a plurality of cells, a portion of the interconnected framework members comprising a side branch structure defining an inner side branch cell having a side branch center point, the inner side branch cell being shaped differently than other cells of the stent;
• the side branch structure comprising:
• a first serpentine ring extending around the inner side branch cell, the first serpentine ring comprising a plurality of curved portions including convex curved portions that are convex with respect to the side branch center point, and concave curved portions that are concave with respect to the side branch center point, the convex curved portions including first convex curved portions and second convex curved portions, the second convex curved portions located farther away from the side branch center point than the first convex curved portions;
• a second serpentine ring extending around the first serpentine ring;
• and
• a plurality of side branch connectors extending between the first serpentine ring and the second serpentine ring, at least one side branch connector connected to a second convex curved portion.