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Implantable medical device having flat electrolytic capacitor formed with nonthrough-etched and through-hole punctured anode sheets

  • US 6,409,776 B1
  • Filed: 06/30/2000
  • Issued: 06/25/2002
  • Est. Priority Date: 06/30/2000
  • Status: Expired due to Term
First Claim
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1. A process for making an anode layer for use in an electrolytic capacitor comprising the steps of(a) providing a thin metallic anode foil;

  • (b) etching said thin metallic anode foil to form pores extending part way through the thin metallic anode foil thereby forming an etched anode foil providing enhanced surface area (c) cutting the etched anode foil to provide first, second and third etched anode sheets each having first and second opposed major surfaces bounded by an anode sheet edge and an anode sheet thickness;

    (d) forming a plurality of through-holes extending between said first and second opposed major surfaces and through said anode sheet thickness of said first and second etched anode sheets;

    (e) forming an oxide layer overlying the pore and through-hole surfaces of said first and second etched anode sheet and the pore surfaces of the third etched anode sheet; and

    (f) assembling said first, second and third etched anode sheets into an anode layer having the third etched anode sheet assembled between the first and second etched anode sheets.

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