Method for cardiac defibrillation
First Claim
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1. A system for cardiac defibrillation which comprises:
- an implanted defibrillator having means for sensing R-waves;
energy storage means;
charging means for charging the energy storage means;
discharging means for discharging the energy storage means and delivering a shock to the heart;
means for measuring R-R intervals from said sensed R-waves;
means for commencing charging of said storage means if an arrhythmia is detected;
means for determining whether the arrhythmia is still in progress;
means for discontinuing the charging if the arrhythmia is not still in progress;
means for detecting another R-R interval if said storage means is charged a predetermined amount; and
said discharging means delivering said shock to the heart if said another R-R interval is shorter than a selected amount.
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Abstract
A method for cardiac defibrillation is described, for use with an implanted defibrillator. A patient'"'"'s R-waves are sensed to detect the R-R intervals. If an arrhythmia is detected, the charging of a capacitor is commenced. Determination are made whether the arrhythmia is still in progress and whether the capacitor is charged a predetermined amount. If the arrhythmia is not still in progress, the charging is discontinued. If the arrhythmia is still in progress and the capacitors are charged a predetermined amount, another R-R interval is detected and if the R-R interval is shorter than a selected amount, a shock is delivered to the heart.
220 Citations
14 Claims
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1. A system for cardiac defibrillation which comprises:
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an implanted defibrillator having means for sensing R-waves; energy storage means; charging means for charging the energy storage means; discharging means for discharging the energy storage means and delivering a shock to the heart; means for measuring R-R intervals from said sensed R-waves; means for commencing charging of said storage means if an arrhythmia is detected; means for determining whether the arrhythmia is still in progress; means for discontinuing the charging if the arrhythmia is not still in progress; means for detecting another R-R interval if said storage means is charged a predetermined amount; and said discharging means delivering said shock to the heart if said another R-R interval is shorter than a selected amount. - View Dependent Claims (2)
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3. A method for cardiac defibrillation with an implanted defibrillator having means for sensing R-waves, energy storage means, charging means and discharging means for delivering a shock to the heart, which method comprises the steps of:
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sensing a patient'"'"'s R-waves to detect R-R intervals; if an arrhythmia is detected, then commencing charging of said storage means; determining whether the arrhythmia is still in progress; if said arrhythmia is still in progress, then determining if said storage means is charged a predetermined amount; if said storage means is charged, said pre-determined amount, then detecting another R-R interval; if said another R-R interval is shorter than a selected amount, then delivering a shock to the heart. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A method for cardiac defibrillation with an implanted defibrillator having means for sensing R-waves, energy storage means, charging means and discharging means for delivering a shock to the heart, which method comprises the steps of:
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sensing a patient'"'"'s R-waves to detect R-R intervals; if an arrhythmia is detected, then commencing charging of said storage means; determining whether the arrhythmia is still in progress; if said arrhythmia is not still in progress, then discontinuing the charging; if said arrhythmia is still in progress, then determining if said storage means is charged a predetermined amount; if said storage means is charged said predetermined amount, then detecting another R-R interval; if said another R-R interval is shorter than a selected amount, then delivering a shock to the heart; if said another R-R interval is not shorter than a predetermined amount, then determining whether the arrhythmia is still in progress; if said arrhythmia is still in progress then detecting another R-wave, determining whether the previous R-R interval was shorter than a selected amount, and delivering a shock to the heart if said previous R-R interval was shorter than a selected amount; and if said arrhythmia is not still in progress, then inhibiting the delivery of a shock to the heart. - View Dependent Claims (10)
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11. A method for cardiac defibrillation with an implanted defibrillator having means for sensing R-waves, energy storage means, charging means and discharging means for delivering a shock to the heart, which method comprises the steps of:
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sensing a patient'"'"'s R-waves to detect R-R intervals; if an arrhythmia is detected, then commencing charging of said storage means; determining whether the arrhythmia is still in progress; if said arrhythmia is still in progress, then determining if said storage means is charged a predetermined amount; if said storage means is charged said predetermined amount, then detecting another R-R interval; if said another R-R interval is shorter than a selected amount, then delivering a shock to the heart; and if said another R-R interval is not shorter than a predetermined amount, then determining whether the arrhythmia is still in progress;
if said arrhythmia is still in progress then detecting another R-wave, determining whether the last R-R interval was shorter than a selected amount, and delivering a shock to the heart if said last R-R interval was shorter than a selected amount. - View Dependent Claims (12, 13, 14)
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Specification