An electrode device for amplitude-integrated electroencephalography (aEEG), comprising: a housing mounted on an adhesive element to adhere the electrode device to a skin surface of a patient; an electrode plate placed in the housing at a certain distance from a support surface of the housing forming a hollow space ; a wire connection for the electrode plate , said wire connection having a given length and comprising a proximal end and a distal end; the housing comprising a first protruding part and a second protruding part , the first protruding part including a first hole , and the second protruding part including a second hole through which the proximal end of the wire connection is introduced and attached to the electrode plate , the second protruding part being disposed on the axis of the housing , wherein: the device further comprises a third protruding part that is symmetrically arranged with regard to the first protruding part ; and the first protruding part is disposed in the housing inclined outwardly at an angle between 50-degree and 80-degree with respect to a contact surface of the electrode device, the first hole having a conical-shaped geometry and being configured to inject an electroconductive gel inside the hollow space , and the third protruding part including a conical-shaped hole configured to remove the electroconductive gel from the hollow space . a housing mounted on an adhesive element to adhere the electrode device to a skin surface of a patient; an electrode plate placed in the housing at a certain distance from a support surface of the housing forming a hollow space ; a wire connection for the electrode plate , said wire connection having a given length and comprising a proximal end and a distal end; the housing comprising a first protruding part and a second protruding part , the first protruding part including a first hole , and the second protruding part including a second hole through which the proximal end of the wire connection is introduced and attached to the electrode plate , the second protruding part being disposed on the axis of the housing , wherein: the device further comprises a third protruding part that is symmetrically arranged with regard to the first protruding part ; and the first protruding part is disposed in the housing inclined outwardly at an angle between 50-degree and 80-degree with respect to a contact surface of the electrode device, the first hole having a conical-shaped geometry and being configured to inject an electroconductive gel inside the hollow space , and the third protruding part including a conical-shaped hole configured to remove the electroconductive gel from the hollow space . the device further comprises a third protruding part that is symmetrically arranged with regard to the first protruding part ; and the first protruding part is disposed in the housing inclined outwardly at an angle between 50-degree and 80-degree with respect to a contact surface of the electrode device, the first hole having a conical-shaped geometry and being configured to inject an electroconductive gel inside the hollow space , and the third protruding part including a conical-shaped hole configured to remove the electroconductive gel from the hollow space . <EOS>