Source implantable energy ultrafine.

implantable energy source comprising at least one energy storage subsystem (171) configured as a stack of thin layers (175) on a substrate (176), characterized in that said subsystem energy storage has a plurality of through apertures (174) to enable the development and the passage of blood vessels. Preferably, the power source present on at least 80% of its surface, a thickness less than or equal to 1 mm.