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Implantable automatic difibrillator with low threshold

  • US 5,529,579 A
  • Filed: 05/12/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 05/12/1994
  • Status: Expired due to Term
First Claim
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1. An automatic defibrillator adapted to be implanted in the body of a patient, comprising stimulus generator means for sensing fibrillation of the patient'"'"'s heart and responsive thereto for delivering defibrillation energy to the patient'"'"'s heart via a defibrillation electrode adapted to be positioned in the heart, an electrically conductive case housing said stimulus generator means, and a conforming biocompatible electrically insulating layer coating a central region at a side of the case which is to face inwardly of the patient'"'"'s body when the stimulus generator means is implanted, to leave at least a portion of the edge bounding said side uninsulated and thereby produce a predetermined electric field concentration between said defibrillation electrode and the uninsulated portion of the boundary edge of said side when the case is used as an electrode for defibrillation.

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