A medical implant comprising: a housing, wherein the housing is composed of an insulator material as a dielectric at least in a part region and the insulator material respectively has at least one electrically conductive contact surface (4, 4a, 4b...5, 5a, 5b...6, 6a, 6b...7, 7a, 7b...) at the inner side and outer sider of the housing, said electrically conductive contact surface acting as a capacitor electrode and forming a capacitor together with the insulator material; wherein there is no electrically conductive connection between the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing and the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing; wherein the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing has lamellae or plates which project into the insulator material from the inner side of the housing; wherein the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing has lamellae or plates which project into the insulator material from the outer side of the housing; and wherein the lamellae or plates of the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing and the lamellae or plates of the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing are arranged alternately and form the capacitor; a control which is accommodated within the housing and which is connected to the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing in order to supply power to said housing; and at least one stimulation electrode which is located outside the housing and which is electrically conductively connected to the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing. a housing, wherein the housing is composed of an insulator material as a dielectric at least in a part region and the insulator material respectively has at least one electrically conductive contact surface (4, 4a, 4b...5, 5a, 5b...6, 6a, 6b...7, 7a, 7b...) at the inner side and outer sider of the housing, said electrically conductive contact surface acting as a capacitor electrode and forming a capacitor together with the insulator material; wherein there is no electrically conductive connection between the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing and the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing; wherein the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing has lamellae or plates which project into the insulator material from the inner side of the housing; wherein the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing has lamellae or plates which project into the insulator material from the outer side of the housing; and wherein the lamellae or plates of the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing and the lamellae or plates of the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing are arranged alternately and form the capacitor; a control which is accommodated within the housing and which is connected to the at least one electrically conductive contact surface (4, 4a, 4b...6, 6a, 6b...) at the inner side of the housing in order to supply power to said housing; and at least one stimulation electrode which is located outside the housing and which is electrically conductively connected to the at least one electrically conductive contact surface (5, 5a, 5b...7, 7a, 7b...) at the outer side of the housing.