Patent ID: 8795347

Claim:
A method of treating a bifurcated vessel, said method comprising: providing a first delivery catheter and a second delivery catheter in a delivery configuration, wherein the first delivery catheter comprises a first elongate shaft, and a first expandable member, and the second delivery catheter comprises a second elongate shaft, a second expandable member, and a stent having a side hole, the stent disposed over the second expandable member, and wherein a portion of the first elongate shaft is disposed under the stent and the first elongate shaft exits the side hole in the stent, the first expandable member being distal to the second expandable member and the first expandable member not having a stent mounted thereon in the delivery configuration; advancing both the first delivery catheter and the second delivery catheter concurrently in the delivery configuration through a main branch vessel having a lesion to a bifurcation in the main branch, the bifurcation comprising a side branch vessel extending from the main branch vessel, wherein the stent is advanced until the stent is in the main branch and traverses the main branch lesion, and the side hole is adjacent the ostium to the side branch, and the first expandable member is disposed in the side branch; proximally retracting the first elongate shaft under a portion of the stent so that the first expandable member moves proximally from distal of the bifurcation until the first expandable member is disposed under the stent while another portion of the first expandable member is disposed in the side branch prior to expanding the second expandable member; radially expanding the first expandable member while the first expandable member is disposed under the stent and the other portion is disposed in the side branch, thereby expanding a proximal portion of the stent into engagement with the lesion in the main branch and expanding the side hole while a distal portion of the stent remains unexpanded; and radially expanding the second expandable member, thereby expanding a distal portion of the stent into engagement with the lesion in the main branch and the wall of the main branch.