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Implantable medical device having flat electrolytic capacitor with cathode/case electrical connections
| Details |
Inventors: Miltich, Thomas P.; Pignato, Paul A.; Breyen, Mark D.; Casby, Kurt J.; Johnson, William L.;
Assignee: Medtronic, Inc. (Minneapolis, MN)
Primary Examiner: Nguyen; Ha Tran
Assistant Examiner:
Attorney, Agent or Firm: Wolde-Michael; Girma
Flat electrolytic capacitors particularly for use in implantable medical devices having stacked cathode and anode layers particular electrical connections of the capacitor anode and cathode layers with a capacitor connector assembly. Anode terminal means extend through the capacitor case side wall for electrically connecting a plurality of the anode tabs to one another and providing an anode connection terminal at the exterior of the case that is electrically insulated from the case. A cathode terminal extends through or to an encapsulation area of the capacitor case side wall via a cathode terminal passageway for electrically connecting a plurality of the cathode tabs to one another and providing a cathode connection terminal at the exterior of the case. The connector assembly is electrically attached to the anode connection terminal for making electrical connection with the anode tabs and to the cathode connection terminal for making electrical connection with the cathode tabs. The cathode terminal passageway comprises a cathode opening extending through the case wall, and the cathode terminal comprises a cathode wire or feedthrough pin extending from the gathered cathode tabs into or through the cathode opening providing the cathode connection terminal electrically connected with the case. Alternatively, the terminal passageway comprises a portion of an interior ledge of the side wall upper opening edge having a width and depth depressed below the upper opening edge and a cover edge portion overlying the ledge to trap the cathode terminal when the cover is welded to the crimped upper edge. The cathode terminal comprises a cathode tab extension foil attached to the gathered cathode tabs or an extension of one, a plurality or all of the cathode tabs. |
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DETAILED DESCRIPTION The present invention provides various cathode connections with a case of a case negative electrolytic capacitor that provides cathode connection terminals for attachment with a connector assembly, particularly to facilitate connection of the electrolytic capacitor with circuitry of an IMD.
In one embodiment, the capacitor comprises an electrode stack assembly and electrolyte are located within the interior case chamber of a hermetically sealed capacitor case.
The electrode stack assembly comprises a plurality of capacitor layers stacked in registration upon one another, each capacitor layer comprising a cathode layer having a cathode tab, an anode sub-assembly comprising at least one anode layer having an anode tab, and a separator layer located between adjacent anode and cathode layers, whereby all adjacent cathode layers and anode layers of the stack are electrically insulated from one another by a separator layer.
Anode terminal means extend through the capacitor case side wall for electrically connecting a plurality of the anode tabs to one another and providing an anode connection terminal at the exterior of the case that is electrically insulated from the case.
A cathode terminal extends through or to an encapsulation area of the capacitor case side wall via a cathode terminal passageway for electrically connecting a plurality of the cathode tabs to one another and providing a cathode connection terminal at the exterior of the case.
A connector assembly is electrically attached to the anode connection terminal for making electrical connection with the anode tabs and to the cathode connection terminal for making electrical connection with the cathode 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
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Metal Working 
