A balloon dilation assembly configured to be used for performing balloon valvuloplasty in order to dilate a stenotic heart valve, in particular a stenotic aortic valve.The assembly comprises at least three outer balloons (12), (13), (14) evenly arranged in a circle around a central balloon (11) and fixed to the central balloon, and comprises a further outer balloon (15) which is shorter in length compared with balloons (11), (12), (13), (14) and which is not fixed to the central balloon, whereby each balloon has a separate filling tube (1), (2), (3), (4), (5) used for inflating each balloon separately, characterized in that the short outer balloon (15) is equipped with a sensing and/or stimulation system comprising an electrical pole (21).
