A method for treating a diseased body conduit at a bifurcation point is provided. A system having devices mounted thereon is advanced into the bifurcated region of the conduit. The system includes a delivery means, such as a catheter having a shaft with varying torsional properties along its length and a delivery apparatus mounted at its distal end. A distal end of the delivery means can be inserted into the main branch and at least one side branch of a vessel bifurcation. The distal end includes at least two expansion members having expandable devices or prostheses mounted thereon. One device is configured such that one expansion member extends through the length of the scaffold while the other expansion member extends through the side-structure of the scaffold. A second scaffold is mounted on the expansion member extending through the side-structure of the first scaffold. The devices are positioned within the main and side branches of the bifurcation and are expanded.