An eccentric screw pump has a plurality of segments extending along an axis and together forming a tubular casing generally centered on the axis and a plurality of axially extending stator shells of elastic material together forming inside the casing a tubular stator having axially opposite ends each having centered on the axis a frustoconical end seal surface. The position and size of the strain-inducing region may be determined on the basis of an implantation mask and respective implantation parameters, thereby providing a high degree of compatibility with conventional techniques, since the strain-inducing region may be incorporated at an early manufacturing stage, directly to respective \u201clarge area\u201d contact elements. The medical device also has an energy transfer element mounted to the concave support element and electrically connected to a control unit.