Cardiac defibrillator with high energy storage antiferroelectric capacitor
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Apr 19, 1995
filing date -
Apr 19, 1995
priority date (Note) -
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Abstract
A cardiac defibrillator which incorporates the invention hereof includes a multilayer capacitor with a plurality of conductive electrodes and interspersed dielectric layers, each dielectric layer composed of constituents which cause the dielectric layer to exhibit antiferroelectric characteristics. The defibrillator includes a charging circuit for applying to the capacitor an electric field across each dielectric layer that is at least equal to E.sub.f, where E.sub.f is a field value that enables the dielectric layer to transition to a ferroelectric phase. A preferred dielectric material comprises lead, lanthanum, zirconium and titanium, all at constituent values which cause the resulting ceramic material to lie within the antiferroelectric region.
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