Patent ID: 8452397

Claim:
A pacemaker used by a patient, comprising: an implantable pacemaker housing; a pulse generator arranged in the pacemaker housing that generates a stimulation pulse; a pacemaker electrode that transmits the stimulation pulse to a heart of the patient; a switching element that regulates a current flowing through the pacemaker electrode to the heart of the patient, the current being induced by an external magnetic field; a telemetry unit that switches the switching element; and an identification unit arranged inside the pacemaker electrode, wherein the identification unit is a radio frequency identification chip, wherein a stimulation threshold of the pacemaker is not affected by the external magnetic field when the pacemaker is active if the external magnetic field does not exceed an admissible threshold value, wherein the pacemaker comprises a magnetically actuatable fixing element for fixing the pacemaker electrode, wherein the switching element is reversibly actuatable for renewed activation of the pacemaker after a preceding shutdown, wherein the stimulation threshold of the pacemaker changes over time as a result of tissue fibrosis in a tip of the pacemaker electrode that may lead the pacemaker to no longer function, wherein the tip of the pacemaker electrode comprises a plurality of recesses for holding an active substance, and wherein the tissue fibrosis is prevented by a long-lasting release of the active substance from the tip of the pacemaker electrode so that the stimulation threshold of the pacemaker is not increased significantly.