Electrode for cardiac stimulator

Abstract

Abstract An electrode having a pair of electrical conductors encapsulated in a unitary, homogeneous body of flexible nonconductive plastic material, such as silicone rubber. The electrical conductors are platinum alloy coil springs having spaced coils. The plastic body surrounds the coils and fills part of or the entire centers of the springs. The process of making the electrode utilizes a three-piece mold comprising a pair of identical female molds and a male mold. The female molds have elongated cavities of a size and shape of one-half of the plastic body covering the conductors. The male mold has elongated ribs which each have a volume equal to one-half of the volume occupied by the conductor coils plus one-half of any volume to be left void. The halves of the bodies are initially made by mounting the male mold in assembled relation with the female mold and injecting plastic into the mold cavity under high pressure. The male mold is then removed from the female mold exposing the grooves in the molded halves of the bodies. The conductors are then placed between the halves of the bodies in alignment with the grooves formed by the ribs of the male mold. The conductors are encapsulated in the body by combining the halves of the body into a one-piece member by simultaneously subjecting the assembled female molds to a high pressure and temperature sufficient to cause the plastic to flow between the coils of the conductors to fill the center portions of the conductors.

Inventors

• 👤 Lee R Bolduc

Bibliographic Details