IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0277399
(2006-03-24)
|
등록번호 |
US-7558051
(2009-07-15)
|
발명자
/ 주소 |
- O'Phelan, Michael J.
- Christenson, Luke J.
- Poplett, James M.
- Tong, Robert R.
|
출원인 / 주소 |
|
대리인 / 주소 |
Schwegman, Lundberg & Woessner, P.A.
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
95 |
초록
▼
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 capacitor, which stores and delivers life-saving bursts of electric charge to a fib
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 capacitor, which stores and delivers life-saving bursts of electric charge to a fibrillating heart. To reduce capacitor size, manufacturers have developed special aluminum foils, such as core-etched and tunnel-etched aluminum foils. Unfortunately, core-etched foils don't work well in multiple-anode capacitors, and tunnel-etched foils are brittle and tend to break when making some common types of capacitors. Accordingly, the inventors devised a new foil structure having perforations and cavities. 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.
대표청구항
▼
What is claimed is: 1. A capacitor comprising a foil having a foil thickness; means, including at least eight perforations, for allowing passage of an electrolyte; and one or more cavities having a depth less than the foil thickness. 2. The capacitor of claim 1, wherein the foil has first and sec
What is claimed is: 1. A capacitor comprising a foil having a foil thickness; means, including at least eight perforations, for allowing passage of an electrolyte; and one or more cavities having a depth less than the foil thickness. 2. The capacitor of claim 1, wherein the foil has first and second opposing sides, with one or more of the cavities on the first side and one or more of the cavities on the second side and wherein the average depth of the cavities is less than one-half the foil thickness. 3. The capacitor of claim 2, wherein the average depth of the cavities is about one-third or one-fourth of the foil thickness. 4. The capacitor of claim 1, wherein the perforations have an average cross-sectional area larger than an average cross-sectional area of the cavities. 5. The capacitor of claim 1, wherein each perforation has a generally circular shape. 6. The capacitor of claim 1, wherein the foil comprises at least one of aluminum, tantalum, hafnium, niobium, titanium, and zirconium. 7. The capacitor of claim 1, wherein at least a portion of the foil is rolled. 8. A capacitor comprising: a foil having first and second opposing surfaces which define a foil thickness, with the first opposing surface having one or more cavities each having a maximum depth less than the foil thickness and the second opposing surface having one or more cavities each having a maximum depth less than the foil thickness; and means, including at least six perforations, for allowing passage of electrolyte through the foil. 9. The capacitor of claim 8: wherein the cavities of the first surface have a first average depth and the cavities of the second surface have a second average depth, with the first and second average depths being less than one-half the foil thickness; or wherein the perforations have an average cross-sectional area at least twice an average maximum cross-sectional area of the cavities; or wherein at least a portion of the foil is rolled. 10. The capacitor of claim 8, wherein the foil comprises at least one of aluminum, and titanium. 11. The capacitor of claim 8, wherein each perforation has a generally circular shape. 12. An aluminum electrolytic capacitor comprising: at least one aluminum anode foil having first and second opposing surfaces which define a foil thickness, with the first opposing surface having one or more cavities and the second opposing surface having one or more cavities, the cavities of the first and second surfaces having an average maximum depth less than one half the foil thickness and having an average maximum cross-sectional area; and means, including at least six perforations, for allowing passage of electrolyte through the aluminum anode foil, with the perforations having an average maximum cross-sectional area at least twice the average maximum cross-sectional area of the cavities. 13. The aluminum electrolytic capacitor of claim 12: wherein the average depth of the cavities is about one-third or one-fourth the foil thickness; or wherein the perforations have an average maximum cross-sectional area about 2 to 100 times larger than the average maximum cross-sectional area of the cavities. 14. The capacitor of claim 13, wherein the foil comprises titanium. 15. The capacitor of claim 13, wherein each perforation has a generally circular shape. 16. A capacitor comprising: at least one perforated-core-etched foil; or at least one perforated-core-etched foil adjacent at least one core-etched foil; or at least one perforated-core-etched foil, at least one core-etched foil, and at least one tunnel-etched foil; wherein each perforated core-etched foil comprises: first and second opposing surfaces which define a foil thickness, with the first opposing surface having one or more cavities each having a maximum depth less than the foil thickness and the second opposing surface having one or more cavities each having a maximum depth less than the foil thickness: and means, including at least six perforations, for allowing passage of electrolyte through the foil. 17. The capacitor of claim 16 wherein the cavities of the first surface have a first average depth and the cavities of the second surface have a second average depth, with the first and second average depths being less than one-half the foil thickness. 18. The capacitor of claim 16, wherein the foil comprises titanium. 19. The capacitor of claim 16, wherein each perforation has a generally circular shape.
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