The present invention relates to an implantable electrode device comprising a carrier made of a polymer material, wherein the carrier is flexible and electrically isolating, at least one measure-ment electrode formed by an electrically conducting pad located on the carrier, wherein the elec-trically conducting pad has a contact surface, at least one electrically conducting trace, and at least one electrically conducting terminal, wherein the trace electrically connects the measure-ment electrode and the terminal. Implantable electrode devices of this type are not suitable to remain implantable over a long time. In order to provide an implantable electrode device which may remain in a patient’s body the present invention suggest to further develop the implantable electrode such that the implantable electrode device further comprises a barrier layer enclosing the carrier by covering all surfaces thereof, wherein the contact surface of the conducting pad is exposed to an outside environment, and wherein a surface of the electrode device on a side on which the measurement electrode is located has a maximum valley depth or a maximum peak height between the contact surface of the measurement electrode and a meanline of the surface of the electrode device excluding the measurement electrodes being equal to or smaller than 60 micrometres or wherein a surface of the electrode device on a side on which the measurement electrode is located has a maximum valley depth or a maximum peak height between the contact surface of the measurement electrode and a meanline of the surface of the electrode device ex-cluding the measurement electrodes being larger than 60 micrometres and wherein the maximum linear extension of the contact surface is equal to or less than 100 micrometres.本發明關於一種植入式電極裝置,包含:載體,由聚合物材料所製成,其中該載體為撓性及電隔離、至少一個測量電極,由位於該載體上的導電墊所形成,其中該導電墊具有接觸表面、至少一個導電走線及至少一個導電終端,其中該走線電連接該測量電極與該終端。此類型的植入式電極裝置不適合長時間保持植入。為了提供一種可留在患者的身體中的植入式電極裝置,本發明建議進一步發展該植入式電極,使得該植入式電極裝置進一步包含:阻障層,藉由覆蓋其所有表
