A medical device delivers a therapy to a patient. The pull rod is movable on the first vehicle body between a locking position and a release position. The width of the extension of the extension ) between the forward surface and the rear surface from at least the opening of the ear canal to the tip of the extension is substantially less than the width of the ear canal, leaving an open air passage. or less at which no popping phenomenon happens, for removing the hardened layer, and a second step for conducting an ashing process at a second temperature e. The actuation electrode provides a polarization voltage to generate an electrostatic force, thereby attract the flexible vibration area to curve downwards so that the flat vibration area moves in a flat state and a distance between the flat vibration area and the sensible electrode is varied correspondingly. Two opposing panels are coated with a textile.