A medical device comprises a catheter having a catheter shaft and a balloon located at the distal end of the catheter shaft, and a bifurcated stent. The bifurcated stent comprises a trunk and at least two joined cylindrical parts extending from the trunk. A first part is capable of radially self-expanding and a second part is radially expandable only by means of a force applied thereto. At least a portion of the second part is disposed about the balloon prior to being radially expanded.