Electrical connection of wire conductor(s) to a terminal pin in an electrode assembly of a pacing lead

An electrode assembly adapted to be mounted at the distal end of a pacing lead, said electrode assembly comprising a mushroom shaped tip electrode having a terminal pin with a diameter less than the diameter of the tip and extending rearwardly therefrom, a sleeve of insulating material positioned around said terminal pin and at least two coiled wire conductor bared end portions of the pacing lead being coiled in a spiral formation with a predetermined pitch and a predetermined axial spacing between adjacent groups of turns of wire conductors and being received on said terminal pin within said sleeve, said pin having a spiral, thread-like formation including a spiral groove and a sprial ridge thereon with a pitch equal to said predetermined pitch and a spacing between axially spaced portions of said spiral groove equal to said predetermined spacing and onto which said bared wire conductor end portions are threaded to form a secure and good mechanical and electrical connection between said terminal pin and said bared wire conductor end portions.