FIG. 8 illustrates a magnetic core positioned within the implantable receiver coil according to an embodiment of the disclosure. In an embodiment, at least one turn of the transmitter coil is non-parallel to the implantable receiver coil, as illustrated by planes 804 and 806 being non-parallel to 802. Additionally, or alternatively, at least one turn of the transmitter coil is non-coaxial with the receiver coil, as illustrated by axis 810 and 812 being non-coaxial with 808. In an embodiment, the implantable receiver coil 212 is in a first plane 802 and the loop structure is along a second plane (parallel to the surface of paper). The first plane 802 and the second plane being at least substantially perpendicular to each other.
In another embodiment, the implantable unit comprises an implantable magnetic core 814 that is configured to be positioned within an area enclosed by a perimeter of the implantable receiver coil 212. The magnetic core is adapted to direct the magnetic field lines to pass through the implantable receiver coil, thus further improving the coupling coefficient between the transmitter coil and receiver coil.
In view of any one of the FIGS. 2, 3, 6 through 8, it is evident that the fixation unit 214 is configured to attach the loop structure 210 around the body part (FIGS. 3, 6A, 310) such that the loop structure 210 and the implantable receiver coil 212 are arranged in an interlocked hopf link configuration.
