Patent ID: 8702777

Claim:
An apparatus for treating an ostium communicating between a main body lumen and a branch body lumen, comprising: an elongate member comprising a proximal end, a distal end sized for introduction into the main body lumen and the branch body lumen; a first expandable member formed from substantially compliant material on the distal end, the first expandable member being expandable from a collapsed configuration to a substantially spherical expanded configuration; a second expandable member formed from substantially non-compliant material on the distal end adjacent the first expandable member, the second expandable member being expandable from a collapsed configuration to a substantially cylindrical expanded configuration; and a stent on the distal end over the first and second expandable members, the stent comprising a first flaring portion overlying a portion of the first expandable member, and a second main portion comprising a distal main portion overlying the second expandable member, and a proximal main portion connecting the first flaring portion to the distal main portion, the proximal main portion overlying a transition between the first and second expandable members; the first and second expandable members being independently expandable such that, when the first expandable member is expanded, the first flaring portion of the stent is expanded to a flared condition while the second expandable member remains in the collapsed configuration, and when the second expandable member is subsequently expanded, the second main portion is expanded radially outwardly and the first flaring portion is further expanded radially outwardly, wherein the first flaring portion of the stent comprises: a first set of cells disposed at the first end; a second set of cells including first ends coupled to the first set of cells and second ends opposite the first ends, and a plurality of flexible connectors coupled to the second ends of the second set of cells to connect the second set of cells to the second portion of the stent, wherein the second set of cells comprises struts connected to curved segments, the curved segments having a lower yield strength than the struts.