The present invention relates to a kind of implanted electrode devices, include: carrier, the carrier are made of polymer material, and wherein the carrier is flexible and is electrically isolated At least one measuring electrode, at least one described measuring electrode are formed by the conductive pad being located on the carrier, and wherein the conductive pad has contact surface, at least one conductive trace and at least one conductive terminal, and wherein the trace is electrically connected the measuring electrode and the terminal. The implanted electrode device of this type is not suitable for keeping being implanted into for a long time. In order to provide a kind of implanted electrode device that can be stayed in the body of patient,It is proposed that further developing the implanted electrode,So that the implanted electrode device further includes: barrier layer,The barrier layer surrounds the carrier by covering all surface of the carrier,Wherein the contact surface of the conductive pad is exposed to external environment,And wherein the electrode assembly have on the surface on the side that the measuring electrode is located at include between the contact surface of the measuring electrode and not equal to or less than 60 microns the electrode assembly of the measuring electrode the surface middle line between maximum valley depth or maximum sharpness height,Or wherein the electrode assembly have on the surface on the side that the measuring electrode is located at include between the contact surface of the measuring electrode and not greater than 60 microns the electrode assembly of the measuring electrode the surface middle line between maximum valley depth or maximum sharpness height and wherein the maximum linear of the contact surface extends and is equal to or less than 100 microns.