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High-energy capacitors for implantable defibrillators
| Details |
Inventors: O'Phelan, Michael J.; Christenson, Luke J.; Poplett, James M.; Tong, Robert R.;
Assignee: Cardiac Pacemakers, Inc. (St. Paul, MN)
Primary Examiner: Layno; Carl H.
Assistant Examiner:
Attorney, Agent or Firm: Schwegman, Lundberg, Woessner & Kluth, P.A.
Implantable defibrillators are implanted into the chests of patients prone to suffering ventricular fibrillation, a potentially fatal heart condition. A critical component in these devices is an aluminum electrolytic capacitors, which stores and delivers one or more life-saving bursts of electric charge to a fibrillating heart. To reduce the size of these devices, capacitor manufacturers have developed special aluminum foils, for example core-etched and tunnel-etched aluminum foils. Unfortunately, core-etched foils don't work well in multiple-anode capacitors, and tunnel-etched foils are quite brittle and tend to break when making some common types of capacitors. Accordingly, the inventors devised a new foil structure having one or more perforations and one or more cavities with a depth less than the foil thickness. In an exemplary embodiment, each perforation and cavity has a cross-sectional area, with the perforations having a larger, for example, 2 to 100 times larger, average cross-sectional area than the cavities. Other embodiments of the invention include foil assemblies, capacitors, and implantable defibrillators that benefit from properties of the new foil structure. |
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DETAILED DESCRIPTION To address these and other needs, the present inventors devised a new foil structure which combines the durability of core-etched foils with the electrolyte-flow advantages of tunnel-etched foils.
In addition to devising methods for making the new foil structure, the inventors applied the new foil structure in novel ways to build new capacitor foil assemblies and new capacitors in cylindrical and flat configurations, for example.
Ultimately, these advances allow construction of smaller medical devices, such as implantable defibrillators.
Specifically, one embodiment of the new foil structure is a foil having one or more holes or perforations and one or more cavities with a depth less than the foil thickness.
In an exemplary embodiment, each perforation and cavity has a cross-sectional area, with the perforations having a larger, for example, 2 to 100 times larger, average cross-sectional area than the cavities.
One method of making the new foil structure includes perforating a foil and forming cavities into one or both of its surfaces.
Other methods form the cavities before perforating the foil.
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Metal Working 
