Battery for use with implantable heart pacer

Claim 1

A heart pacer for providing stimulation to the heart of a patient, said pacer comprising terminal means for connection to said heart, pulse generator means for providing stimulation impulses on said terminal means at predictable interimpulse intervals, battery means for energizing said pulse generator means, insulation encapsulating said battery means and said pulse generator means, said battery means comprising an exterior multi-surfaced battery housing, positive and negative electrodes, all but one surface of said housing being employed as one of said electrodes, the other of said electrodes extending from a central portion of said one surface for a predetermined distance, and insulating grommet means located between said electrodes in mutually insulating engagement therewith and having an exterior surface in bonded contact with said insulation, the area of said grommet means exterior surface in said bonded contact with said insulation being at least sufficient to provide substantially leak-proof coverings over each of said positive and negative electrodes thereby to mutually insulate said positive and negative electrodes externally of said battery housing and said grommet means.