PROBLEM TO BE SOLVED: To provide a biomedical electrode capable of stimulating a living body with as small as possible a stimulation threshold value (energy) by devising size, a shape, or arrangement of a lead electrode of a pacemaker to change a density or a flow way (a current density distribution) of a stimulation current.SOLUTION: An electrode 14 for a positive electrode and an electrode 17 or 18 for a negative electrode are disposed in different positions on an insulative substance 13, and an electrochemical effective area of the electrode for the positive electrode is larger than an electrochemical effective area of the electrode for the negative electrode. When a prescribed stimulation portion of the living body is stimulated, the distance between the electrode for the positive electrode and the living body and the distance between the electrode for the negative electrode and the living body vary, and the stimulation current flowing to the negative electrode from the positive electrode flows obliquely to the central axis of the cylindrical or conical insulative substance. The shapes of the electrode for the positive electrode and the electrode for the negative electrode are shapes divided by a plane including the axis of the cylinder, and an insulator is disposed such that one of the semicylinders is projected leftward or upward, and that the other semicylinder is projected rightward or downward.COPYRIGHT: (C)2012,JPO&INPIT【課題】ペースメーカのリード電極の寸法、形状あるいは配置を工夫することによって刺激電流の密度あるいは流れ方(電流密度分布)を変えることによって可能な限り小さな刺激閾値(エネルギ)で生体を刺激できる生体用電極を提供する。【解決手段】正極用電極14と負極用電極17、18が絶縁性物質13の異なる位置に配置され、正極用電極の電気化学的実効面積が負極用の電極の電気化学的実効面積より大きい。生体の所定の刺激部位を刺激する際に、正極用電極と生体までの距離と、負極用電極と生体までの距離とが異なり、かつ、正極から負極に流れる刺激電流は円柱状あるいは円錐状の絶縁性物質の中心軸に対して斜めに流れる。正極用電極と負極用電極の形状が円筒の軸を含む面で分割された形状で、この半円筒の一方を左あるいは上に凸(トツ)に、もう一方の半円筒を右あるいは下に凸(トツ)になるように絶縁物に配置した。【選択図】図3
