An implantable line, in particular an electrode line and/or sensor line and/or medicine supply line for implantation in the left ventricle of the heart with perforation of the atrial or ventricular septum, includes an elongated flexible line body, an electrode and/or a sensor and/or a medicine administering device at or near the distal end of the line body, and a closure element integrally molded on the line body or connected thereto for sealing the perforation site in the septum.
