Bioelectrode and capacitor
An embodiment includes a bioelectrode including a hydrogel film, a conductive film, and a protective film. The conductive film is formed on one surface of the hydrogel film, and the protective film is formed on the other surface of the hydrogel film. The hydrogel film is comprises a mixture of a first material and a second material and is compatible with a living body, the first material configured to cause a sol-gel change at a temperature within a predetermined range around a body temperature of the living body and being compatible with the living body, the second material configured to not cause a sol-gel change at the temperature and being compatible with the living body. The protective film is provided to suppress the infiltration of water into the hydrogel film. The protective film can be made of a waterproof material or a water-repellent material.
1 . A capacitor comprising:
a pair of bioelectrodes, each of the pair of bioelectrodes comprising:
a hydrogel film comprising a mixture of a first material and a second material, the first material configured to cause a sol-gel change at a temperature within a predetermined range around a body temperature of a living body and being compatible with the living body, the second material configured to not cause a sol-gel change at the temperature and being compatible with the living body;
a conductive film formed on one of surfaces of the hydrogel film; and
a protective film formed on the other one of the surfaces of the hydrogel film and configured to suppress infiltration of water into the hydrogel film, and
a polymer film disposed between the pair of bioelectrodes, wherein the pair of bioelectrodes are arranged with the conductive films facing each other.
2 . The capacitor according to claim 1 , wherein the polymer film comprises sodium polyacrylate.
3 . A bioelectrode comprising:
a hydrogel film comprising a mixture of a first material and a second material, the first material configured to cause a sol-gel change at a temperature within a predetermined range around a body temperature of a living body and being compatible with the living body, the second material configured to not cause a sol-gel change at the temperature and being compatible with the living body;
a protective film formed on a first surface of the hydrogel film and configured to suppress infiltration of water into the hydrogel film, and
two conductive films disposed apart from each other on a second surface of the hydrogel film.
4 . The bioelectrode according to claim 3 , wherein each of the two conductive films is formed in a comb-tooth shape having comb teeth, and the comb teeth of the two conductive films are disposed to be alternately inserted.