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Layered capacitor with alignment elements for an implantable cardiac defibrillator
| Details |
Inventors: Fayram, Timothy A.; Pless, Benjamin D.; Parler, Samuel; Elias, William H.; McCall, Scott;
Assignee: Pacesetter, Inc. (Sunnyvale, CA)
Primary Examiner: Kamm; William E.
Assistant Examiner: Layno; Carl H.
Attorney, Agent or Firm: Mitchell; Steven M.
A capacitor for an implantable cardiac defibrillator with a housing defining a chamber. A plurality of flat, stacked, charge storing layers reside within the chamber. Each of the layers includes at least a first and a second electrically conductive sheets separated by a sheet in between. The first sheet is electrically connected to the housing, and the second sheet is electrically isolated from the housing. The layers each have a periphery having at least one alignment element, with the second sheet extending to the periphery along at least a portion of the alignment element, such that the layers may be engaged at the alignment element to register the layers during assembly. |
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DETAILED DESCRIPTION Defibrillators are implanted in patients susceptible to cardiac arrhythmias or fibrillation.
Such devices provide cardioversion or defibrillation by delivering a high voltage shock to the patient's heart, typically about 500-750V.
High voltage capacitors are used in defibrillators to accumulate the high voltage charge following detection of a tachyarrhythmia.
It is desirable to make implantable devices as small as possible, with slim, flat packages being desired for pectorally implanted defibrillators.
Therefore, flat capacitors have been developed to avoid the disadvantages of traditional cylindrical aluminum electrolytic capacitors.
Such a flat capacitor is disclosed in U.
S.
Pat.
No.
5,522,851 to Fayram, which is incorporated herein by reference.
Flat capacitors include a plurality of layers laminarly arranged in a stack.
Each layer includes an anode and a cathode, with the anodes and cathodes being commonly connected to respective connectors.
The layers may be cut in nearly any shape, to fit within a similarly shaped housing designed for a particular application.
The capacitance of such a device is proportional to the number of layers, and to the area of each layer, providing significant design flexibility.
However, it is desirable to further improve the capacitance per unit volume ratio of current devices, which currently devote some volume to clearances for preventing shorting of components, and to fastening and alignment elements for securing the device components to each other.
The present invention overcomes the limitations of the prior art by providing a capacitor for an implantable cardiac defibrillator with a housing defining a chamber.
A plurality of flat, stacked, charge storing layers reside within the chamber.
Each of the layers includes at least a first and a second electrically conductive sheet separated from each other by a separator sheet in between.
The first conductive sheet is electrically connected to the housing, and the second conductive sheet is electrically isolated from the housing
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Metal Working 
