Numerical Study of Coupling between Coagulators and Electrodes of Cardiac Pacemakers

The paper presents a numerical worst-case study of the coupling between coagulators and cardiac pacemakers under consideration of the human body. For this purpose a special body model has been implemented which meets the geometrical dimensions given in DIN 33402. With this model whose electrical properties correspond to a weighted average of those of different tissues of the human body the influence of the latter can be taken into account in the computations. Different parameters such as position of the pacemaker and its electrode, coagulation frequency, and coagulation point on the surface of the human body are considered. Owing to the results of previous investigations simplified approaches to account for the dielectric coating of the coagulator electrodes and housing of the pacemaker can be used. The investigation shows that for the scenario described above peak-to-peak voltages up to about 20 mV result at the input port of the cardiac pacemaker.