A device for expanding a stent to treat a bifurcation within a body lumen has a catheter for delivering and positioning a stent to a bifurcation within a body lumen, the catheter having a balloon positioned adjacent to the stent, the balloon for being inflated to a predetermined configuration to expand the stent, the predetermined configuration having a first balloon portion, a central balloon portion, and a second balloon portion, the central balloon portion for being positioned adjacent to the bifurcation with the central balloon portion being inflated to expand the stent and to form an opening in the stent adjacent to the bifurcation to facilitate better flow into a branch associated with the bifurcation to prevent or limit a compromise or a closure of the branch, the central balloon portion being inflated to a larger diameter that the first balloon portion and the second balloon portion.
