Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1993-10-06
1996-07-30
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 139
Patent
active
055407234
ABSTRACT:
The present invention provides apparatus and methods for delivering an optimum electrical shock in treating cardiac arrhythmias. The invention comprises apparatus for producing an electrical waveform signal at least at two electrodes. The voltage or current of the signal is then detected to determine the signal time constant. The signal time constant is then used in conjunction with a model time constant to determine when the peak amplitude is reached. The waveform is then interrupted when the peak amplitude is reached. Also provided are methods of selecting a cardiac defibrillator by measuring the impedance of implanted electrodes and then selecting a defibrillator having a capacitor which provides an RC time constant equal to that of a model time constant.
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S. A. Feeser, et al. Strength-Duration and Probability of Success Curves for Defibrillation with Biphasic Waveforms Circulation 82, pp. 2128-2141 (1990).
M. W. Kroll, A Minimal Model of the Monophasic Defibrillation Pulse PACE 16 pp. 769-777 (1993).
Hahn Stephen J.
Ideker Raymond E.
Walcott Gregory P.
Cardiac Pacemakers Inc.
Duke University
Getzow Scott M.
Kamm William E.
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