US 12,446,815 B2
Biological electrode
Masayuki Kubo, Kanagawa (JP); and Ryo Futashima, Kanagawa (JP)
Assigned to NOK CORPORATION, Tokyo (JP)
Appl. No. 17/796,944
Filed by NOK CORPORATION, Tokyo (JP)
PCT Filed Jan. 12, 2021, PCT No. PCT/JP2021/000648
§ 371(c)(1), (2) Date Aug. 2, 2022,
PCT Pub. No. WO2021/157287, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2020-019690 (JP), filed on Feb. 7, 2020.
Prior Publication US 2023/0069007 A1, Mar. 2, 2023
Int. Cl. A61B 5/25 (2021.01); A61B 5/268 (2021.01); A61B 5/274 (2021.01); A61B 5/291 (2021.01)
CPC A61B 5/268 (2021.01) [A61B 5/274 (2021.01); A61B 5/291 (2021.01); A61B 2562/0215 (2017.08)] 13 Claims
OG exemplary drawing
 
1. A biological electrode comprising an electrode member made of a conductive rubber having a plurality of electrode portions in contact with a body of a subject, wherein
the plurality of electrode portions are protrusively formed on an electrode portion forming surface of the electrode member and arranged circularly or concentrically on the electrode portion forming surface, and
each of the plurality of electrode portions is formed so that a cross-sectional area thereof gradually decreases from a proximal end portion thereof toward a distal end portion thereof and a center of a cross section of the distal end portion is positioned radially outward of a center of a cross section of the proximal end portion as viewed from an arrangement center of the plurality of electrode portions, wherein
the distal end portion has a hemispherical shape, wherein a diameter of the hemispherical shape defines an outer periphery of the distal end portion, wherein the distal end portion is positioned within an outer periphery of the proximal end portion with respect to a bottom plan view of the electrode portion forming surface, and wherein the diameter of the hemispherical shape is approximately one half a diameter of the outer periphery of the proximal end portion.