A method of positioning a tubular element inside a main blood vessel of a person. The tubular element has a main tube with one or more side openings and a transport wire extending through each side opening. A fixator being positioned in each branch vessel and the corresponding guide wire being attached to the corresponding transport wire, whereby re-routing of the guide wire is performed by pulling the transport wire to have the guide wire extend from the fixator through the corresponding side opening and to the outside of the person. This re-routed guide wire may be used for positioning the tubular element or guiding additional elements from the tubular element and into the branch vessel.
