A device and method for treating pathological narrowing of fluid-carrying conduits of the human body (such as blood vessels) in an area of a bifurcation is disclosed. In particular, a stent system comprising a pair of dissimilar stents, one of which is particularly suited for treating a widened portion of a blood vessel immediately proximal to a bifurcation. A stent delivery system including a handpiece adapted to selectively deliver the stents is also disclosed.