DefinePK

Abstract

A Pacemaker is a device which conducts electrical impulses from pulse generator to heart muscle when the heart beat is abnormal. This electrical impulse are conducted to heart muscle by means of lead cables which numbers one to three to treat the heart problem. The lead cables are considered as multi-layered cable assembly with 1+6+12 helical wires and a straight cylindrical core. These assemblies can be made by three modes of contact in a simple straight strand. The first mode is a core-wire contact where the wires in the layer are in contact with the core only. In the second mode, the wires in the layer are in contact among themselves and not with the core. In the third mode, there is a coupled contact among the core and all the wires. There is no literature handled the lead cable assembly with either the core-wire contact or the wire-wire contact or the coupled contact. An attempt is made in this paper, to model the lead cable strand with a coupled core-wire and wire-wire contact and deduce its equations of equilibrium. The numerical analyses of cable strand force, twisting moment, strand stiffness, contact force, and contact stress are carried out based on the theory of thin rods.