dimensions. The separator material, anode and cathode layer terminals, internal packaging, electrical interconnections, and alignment features and cathode material further increase the thickness and volume of a capacitor. Consequently, these and other components in a capacitor and the desired capacitance limit the extent to which its physical dimensions may be reduced.
Some ICD IPGs employ commercial photoflash capacitors similar to those described by Troup in xe2x80x9cImplantable Cardioverters and Defibrillators,xe2x80x9d Current Problems in Cardiology Volume XIV, Number 12, December 1989, Year Book Medical Publishers, Chicago, and as described in U.S. Pat. No. 4,254,775. The electrodes or anode and cathodes are wound into anode and cathode layers separated by separator layers of the spiral. Anode layers employed in such photoflash capacitors typically comprise one or two sheets of a high puritycathode tabs.
In certain embodiments, the cathode terminal passageway comprises a cathode opening extending through the case wall, and the cathode terminal comprises a cathode feedthrough pin extending through the cathode opening. A cathode feedthrough internal pin end is connected to the plurality of cathode tabs, and a cathode feedthrough external pin end extends away from the case to provide the cathode connection terminal.
In one variation, the cathode opening is hermetically welded with the cathode feedthrough pin extending through it providing the cathode connection terminal extending from the case. The exposed wire end of a cathode wire of the connector assembly is cross-wire welded to the side of cathode feedthrough wire at the cathode connection terminal.
In a further variation, the cathode opening is hermetically welded with the cathode feedthrough