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Implantable cardioverter defibrillator having a smaller displacement volume

  • US 5,405,363 A
  • Filed: 06/21/1994
  • Issued: 04/11/1995
  • Est. Priority Date: 03/15/1991
  • Status: Expired due to Term
First Claim
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1. An implantable cardioverter defibrillator for subcutaneous positioning within a human patient comprising:

  • a sealed housing structure constructed of a biocompatible material and having a displacement volume of less than about 90 cc;

    one or more connector port means, each connector port means disposed in a wall of said housing structure for providing electrical connections between an interior space of said housing structure and a corresponding electrode lead within said human patient;

    circuit means disposed within said interior space of said housing structure and operably connected to said connector port means for sensing cardiac signals received from one or more of said electrode leads and, in response to the detection of an arrhythmia in said cardiac signals, controlling delivery of one or more high energy electrical cardioversion/defibrillation countershocks of at least 0.5 Joules to the myocardium of said human patient;

    capacitor means disposed within said interior space of said housing structure and operably connected to said circuit means for storing electrical energy to generate said electrical cardioversion/defibrillation countershocks and having an effective capacitance value of less than 120 μ

    F; and

    battery means disposed within said interior space of said housing structure and operably connected to said circuit means and said capacitor means for providing electrical energy to said circuit means and said capacitor means,wherein said battery means and said capacitor means are selected such that a maximum electrical charge energy stored by said capacitor means for each of said electrical cardioversion/defibrillation countershocks is less than about 30 J and said implantable cardioverter defibrillator is capable of delivering at least five of said electrical cardioversion/defibrillation countershocks in a four minute period.

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