IMPLANTABLE DEVICE

An implantable device is provided that includes a tubular body with at least one open end, defining an inner space, a cap closing the at least one open end and having an inner surface on one side and an outer surface on the other side, the inner surface facing the inner space, and a circuit board being placed in the inner space, having an active surface, a board electrode disposed on the active surface, and a wireless communication circuit to communicate outside of a body, biological information obtained via the board electrode. Moreover, a recess and an inner electrode are disposed on the inner surface of the cap, and the circuit board is disposed in the recess, and the inner electrode is electrically connected to the board electrode. An outer electrode is disposed on the outer surface of the cap and is electrically connected to the inner electrode.