implantable device with improved nutrition and recharged battery configuration.

an implantable system (10) as a neural stimulator or cochlear implant system that includes an internal battery (14) having improved charging characteristics and lifetime is presented. The battery (14) is housed within the housing of the implant (12) and has a first and a second electrode plate (24). Each electrode plate has a plurality of grooves (26) extending through a substantial portion of the surface area of ​​the plate. The slots in the electrode plates reduce the magnitude of eddy currents induced in the plate by external magnetic fields which allows faster recharge times Battery. Alternatively, the electrode plates are wound in a spiral configuration so that, in the plane of the spiral, the electrode plates have a small sectional area of ​​cut and closed circuits crests current. Additionally, the implant device is housed in a housing (12) formed with a high resistivity material and a circuit included in the implant device is configured to prevent large circuit current peaks that may result in heating due to eddy currents. As a backup option, the circuitry (16) of the implant device can be powered optionally an external battery (15) inductively coupled power with the same coil (22) used to charge the internal battery (14). The implantable system can be divided into a first (112 '') and second (154, 162) implantable housing, each of which has within the circuitry needed and only one has a rechargeable power source inside, facilitating the subsequent replacement for purposes of repair or upgrade. The two shells are coupled together when the system is in use. The magnetically coupling is achieved either by using a proximity system (160) or with a detachable power cord using a connection system (150). In one embodiment of the connection system, energy is transferred from a housing of the implant to the other using a transmission scheme phase.