PROBLEM TO BE SOLVED: To provide a small defibrillation electrode capable of efficiently transmitting energy to a heart.SOLUTION: A defibrillation electrode comprises an electrode part 3 to apply electric energy to a pericardial membrane and a heart, and a lead wire 13 to connect the electrode part to a defibrillator. The electrode part has a left ventricle electrode 4 to be disposed on a left ventricle, and an insulative left ventricle electrode holder 8 having an annular shape covering the left ventricle electrode 4, the left ventricle electrode holder 8 having openings 9 formed thereon to expose a part of the left ventricle electrode 4. In a cross-section perpendicular to the axis of the annular shape of the left ventricle electrode holder 4, the shortest distance between the inner-most part of the left ventricle electrode positioned on the annular shape and an inner edge 8a of the left ventricle electrode holder is shorter than that between the outer-most part of the left ventricle electrode positioned on the annular shape and an outer edge 8c of the left ventricle electrode holder.COPYRIGHT: (C)2015,JPO&INPIT【課題】小型化で効率よく心臓へエネルギーを伝えることができる除細動電極を提供する。【解決手段】除細動電極は、心嚢膜及び心臓に電気エネルギーを印加する電極部3と、電極部を除細動器に接続するリード13を備え、電極部は、左心室側に配される左心室電極4と、左心室電極の一部を露出させる開口部9が形成され、左心室電極の他の部分を覆う絶縁性の環状形状を有する左心室側電極保持体8と有し、左心室側電極保持体は、その環の中心線に交差する断面において、環の最も内側に位置する左心室電極と左心室側電極保持体の内縁8aとの間の最短距離が、環の最も外側に位置する左心室電極と左心室側電極保持体の外縁8cとの間の最短距離よりも短い。【選択図】図2
