Implantable cardioverter defibrillator having a smaller displacement volume

Abstract From the Canadian patent

A capacitor-discharge implantable cardioverter defibrillator (ICD) has a relatively smaller displacement volume of less than about 90cc. The smaller volume of the ICD is achieved by selecting and arranging the internal components of the ICD to deliver a maximum defibrillation countershock optimized in terms of a minimum physiologically effective current (I pe) rather, than a minimum defibrillation threshold energy (DFT). As a result of the optimization in terms of a minimum effective current I pe, there is a significant decrease in the maximum electrical charge energy (E c) that must be stored by the capacitor of the ICD to less than about 30 Joules, even though a higher safety margin …