Patent ID: 8211167

Claim:
A method of positioning a main stent in a main vessel at a vessel bifurcation such that a side opening in the main stent is positioned at an ostium of a branch vessel, the method comprising: positioning a main guidewire in the main vessel such that a distal end of the main guidewire extends past the vessel bifurcation: advancing a stent delivery system over the main guidewire to a position proximate the bifurcation, the stent delivery system comprising a catheter with a flexible side sheath attached thereto, wherein the catheter is received over the main guidewire, and wherein the main stent is positioned over the catheter with the flexible side sheath positioned to pass through an interior of the main stent and out the side opening in the main stent, the flexible side sheath having a distal end portion extending distal of the side opening of the stent; subsequently, advancing a branch guidewire through the flexible side sheath attached to the catheter and into the branch vessel; subsequently, advancing the catheter over the main guidewire while advancing the flexible side sheath over the branch guidewire, wherein the distal end portion of the flexible side sheath advances into the branch vessel; and viewing relative movement of a marker positioned on the distal end portion of the flexible side sheath with respect to at least one marker positioned on the catheter when advancing the flexible side sheath over the branch guidewire, wherein the relative movement indicates that the distal end portion of the flexible side sheath is advancing into the ostium of the branch vessel, thereby indicating a relative position of the side opening of the main stent with respect to the ostium of the branch vessel, wherein viewing the at least one marker positioned on the catheter comprises viewing markers positioned adjacent the distal and proximal ends of the main stent.