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Implantable-unipolar-pacemaker-with-improved-outer-electrode-plate

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Implantable unipolar pacemaker with improved outer electrode plate

Details

Inventors: Schulman, Joseph H.;
Assignee: Pacestter Systems, Inc. (Sylmar, CA)
Primary Examiner: Kamm; William E.
Assistant Examiner:
Attorney, Agent or Firm: Lindenberg, Freilich, Wasserman, Rosen & Fernandez

A unipolar living tissue stimulator of the implantable type with an outer plate electrode which in one embodiment consists of a flat metal plate slotted by slots to form a plurality of electrically conductive strips. Each strip is electrically in contact with any other strip through only a single path. The strips are dimensioned so that any substantially square or circular surface area on any strip is significantly smaller than the total conductive surface area of the plate. Consequently, the heating of the slotted plate due to an external alternating magnetic field is reduced significantly.

DETAILED DESCRIPTION It is a primary object of the present invention to provide a new implantable unipolar pacemaker in which the effects of an external alternating magnetic field on the pacemaker outer plate are minimized.
Another object of the present invention is to provide a novel implantable unipolar pacemaker of the type rechargeable by an external alternating magnetic field in which the heating of the outer electrode is minimized.
These and other objects of the invention are achieved by providng a pacemaker of the unipolar type with an outer electrode plate designed so that any substantially square area of the surface of the plate is a very small fraction of the total conductive surface area of the plate.
In one embodiment this is achieved by slotting the outer electrode metal plate with narrow slots so that the plate effectively defines elongated rectangular narrow strips.
Each of the strips is electrically connected to any other strip through only a single conductive path, with all strips being electrically connected to a common junction.
The novel features of the invention are set forth with particularity in the appended claims.
The invention will best be understood from the following description when read in conjunction with the accompanying drawings.

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