Electrode for detecting bioelectrical signals
The invention relates to an electrode for detecting a bioelectrical signal, for example EEG, on a skin surface. The electrode comprises a coating comprising iridium oxide, where the coating has a nanostructured surface pattern providing for a capillary and hydrophilic effect when in use.
1. An electrode for detecting a bioelectrical signal on a skin surface,
said electrode comprising
a skin contact part,
a substrate made of a metal,
a coating comprising iridium oxide,
wherein the coating covers at least part of the skin contact part of the electrode,
wherein the coating comprises a nanostructured surface pattern, and
wherein the nanostructured surface pattern is configured with multiple intersecting ridges to provide a capillary effect, making the part of the skin contact part that is covered by the coating hydrophilic when in contact with the skin surface.
2. The electrode for detecting a bioelectrical signal on a skin surface according to claim 1 , wherein the electrode has a base diameter of between 1 and 5 mm.
3. The electrode for detecting a bioelectrical signal on a skin surface according to claim 2 , wherein a surface of the skin contact part of the electrode that contacts the skin of a user, is curved with a curvature radius of between 2 and 7 mm.
4. The electrode for detecting a bioelectrical signal on a skin surface according to claim 1 , wherein the substrate is made of titanium.
5. The electrode for detecting a bioelectrical signal on a skin surface according to claim 1 , wherein the coating comprises additives chosen from the group of tantalum, titanium, platinum, and ruthenium.
6. An ear device for arrangement at an ear of a person, the ear device comprising
at least two electrodes according to claim 1 , adapted for detecting a bioelectrical signal from a skin surface when the ear device is arranged at the ear of the person,
an outer surface,
an electronic module comprising power supply means,
wherein the electrodes are provided with a skin contact part arranged on the outer surface of the ear device.
7. The electrode for detecting a bioelectrical signal on a skin surface according to claim 2 , wherein the base diameter is between 1.5 and 3.5 mm.
8. The electrode for detecting a bioelectrical signal on a skin surface according to claim 7 , wherein the base diameter is between 2.0 and 3.0 mm.
9. The electrode for detecting a bioelectrical signal on a skin surface according to claim 8 , wherein the base diameter is 2.6 mm.
10. The electrode for detecting a bioelectrical signal on a skin surface according to claim 3 , wherein the curvature radius is between 2.1 and 5 mm.
11. The electrode for detecting a bioelectrical signal on a skin surface according to claim 10 , wherein the curvature radius is between 2.2 and 4 mm.