Layered Bifurcation Stent

An expandable medical device for implantation in a body lumen, comprising:

• an outer stent and an inner stent, the outer stent having a generally tubular body and being disposed about a longitudinal axis, the outer stent having a proximal end and a distal end, the outer stent also being disposed about the inner stent, the outer stent and the inner stent in combination defining a flow path, the outer stent and the inner stent in combination having an unexpanded state and an expanded state,
• the outer stent comprising members, the members defining cell openings, the cell openings in fluid communication with the flow path, at least one cell opening having a shape different that that of adjacent cell openings, the at least one cell opening positioned between the proximal end and the distal end, the at least one cell being a side opening, the side opening having a perimeter,
• the inner stent comprising a branch portion positioned adjacent to the side opening of the outer stent, the branch portion comprising deployable petals, in the unexpanded state the petals being generally flush against at least a portion of the side opening perimeter, in the expanded state the petals extending outward with respect to the tubular body of the outer stent through the side opening of the outer stent.

An expandable medical device for implantation in a body lumen, comprising:

• an outer stent and an inner stent, the outer stent having a generally tubular body and being disposed about a longitudinal axis, the outer stent having a proximal end and a distal end, the outer stent also being disposed about the inner stent, the outer stent and the inner stent in combination defining a flow path, the outer stent and the inner stent in combination having an unexpanded state and an expanded state,
• the outer stent comprising members, the members defining cell openings, the cell openings in fluid communication with the flow path, at least one cell opening having a shape different that that of adjacent cell openings, the at least one cell opening positioned between the proximal end and the distal end, the at least one cell being a side opening, the side opening having a perimeter,
• the inner stent comprising a branch portion positioned adjacent to the side opening of the outer stent, the branch portion comprising deployable petals, in the unexpanded state the petals being generally flush against at least a portion of the side opening perimeter, in the expanded state the petals extending outward with respect to the tubular body of the outer stent through the side opening of the outer stent.