Described are various embodiments of an improved endoprosthesis that includes a generally cylindrical graft portion that extends along a longitudinal axis to define a flow passage and a plurality of stent hoops. 5, A\u22600, B\u22600, and 1\u2266D\u22666. In case of MIM capacitor, the first metal layer and the second metal layer thereof are electrically coupled to the gate region and the sourcedrain region of the MOS transistor, respectively. In a two-component lens embodiment, the inner lens component, for interfacing with a transducer, may have a concave outer surface and the outer lens component may have a flat or convex outer surface. Since the first electric motor and the second electric motor are disposed adjacently to each other, partial cases for storing these first and second electric motors and may be combined, thus facilitating the accommodation for producing the unit in series.