Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-10-11
1996-07-09
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 5, 607 74, A61N 139
Patent
active
055340156
ABSTRACT:
An implantable defibrillator system for generating biphasic waveforms comprises a self-contained human implantable housing containing a capacitor system for storing an electrical charge, a power supply for charging the capacitor system, and a controller for selectively discharging the electrical charge as a biphasic countershock to be delivered through at least two electrodes in response to a sensing of a cardiac dysrhythmia in the human patient. The controller includes a system for controlling a first duration of a first phase of the biphasic countershock such that the discharge of the electrical charge is of a first polarity and the first duration is variable and a system for controlling a second duration of a second phase of the biphasic countershock such that the discharge of the electrical charge is of a second polarity that is opposite from the first polarity and the second duration is fixed.
REFERENCES:
patent: 4638397 (1987-01-01), Jones et al.
patent: 4821723 (1989-04-01), Baker, Jr. et al.
patent: 4850357 (1989-07-01), Bach
patent: 4998531 (1991-03-01), Bocchi et al.
patent: 5163427 (1992-11-01), Keimel
patent: 5230336 (1993-07-01), Fain et al.
patent: 5468254 (1995-11-01), Hahn et al.
Kroll M. W. et al., Decline in Defibrillation Thresholds, PACE 1993; 16#1:213-217.
Bardy, G. H. et al. A Prospective Fandomized Evaluation of Biphasic vs. Monophasic Waveform Pulses on Defibrillation Efficiency in Humans, J. American College of Cardiology, 1989 14:728-733.
Wyse, D. G. et al., Comparison of Biphasic and Monophasic Shocks for Defibrillation using a Non-Thoracotomy System, American J. Cardiology 1993;71:197-202.
Schuder, J. C. et al. Transthoracic Ventricular Defibrillation with Square-Wave Stimuli: One-Half Cycle, One Cycle and MultiCycle Waveforms, Circulation Research, 1964; 15:258-264.
Kavanagh, K. M. et al., Comparison of the Internal Defibrillation Thresholds for Monophasic and Double and Single Capacitor Biphasic Waveforms, J. American College of Cardiology, 1989; 14:1343-1349.
Freeser, S. A. et al., Strength-Duration and Probability of Success Curves for Defibrillation with Biphasic Waveforms, Circulation, 1990; 82:2128-2141.
Walker R. G., Walcott G. P., Swanson D. K. et al., Relationship of Charge Distribution between Phases in Biphasic Waveforms, Circulation 1992; 86 No. 4:1-792 (Abstract).
Gurvish H. L., Markarychev, V. A.: Defibrillation of the Heart with Biphasic Electrical Impulses, Kardiologilia 1967;7:109-112.
Tchou P., Krum D., Aktar M. Avitall B., Reduction of Defibrillation Energy Requirements with new Biphasic Waveforms, PACE 1990; 13:507 (Abstract).
Jones J. L., Jones R. E., Balasky G., Improved Cardiac Cell Excitation with Symmetrical Biphasic Defibrillator Waveforms, American J. Physiology 1987; 253:H1418-H1424.
Kavanagh K. M., Duff H. J., Clark R., et al., Monophasic vs. Biphasic Cardiac Stimulation: Mechanism of Decreased Energy Requirements, PACE 1990:13;1268-1276.
Swartz J. F., Jones J. L., Jones R. E., Fletcher R. D., Conditioning Prepulse of Biphasic Defibrillator Waveforms Enhances Refractoriness to Fibrillation Wavefronts, Circulation Research 1991;68:438-449.
Karasik P., Jones R., Jones J., Effect of Waveform Duration on Refractory Period Extension Produced by Monophasic and Biphasic Defibrillator Waveforms, PACE 1991;14:715 (abstract).
Tang ASL, Yabe S., Wharton J. M. et al., Ventricular Defibrillation Using Biphasic Waveforms: The Importance of Phasic Defibrillation, J. American College of Cardiology 1989; 13:207-14.
Bourland J. D., Tacker W. A., Geddes L. A. et al., "Comparative Efficacy of Damped Sign Wave and Square Wave current for Transchest Ventricular Defibrillation in Animals", Medical Instrumentation 1978;12#1:38-41.
Irnich W., "The Chronaxie Time and its Practical Importance", PACE 1980;8:870-888.
Kroll M. W., Adams T. P., "The Optimum Pulse Width for the Implantable Defibrillator", 7th Purdue Conference on Defibrillation, American Heart Journal 1992;124#3;835.
Schwartz J. F., Karasik P. E., Donofrio J. et al., "Effect of Biphasic Waveform Tilt on Human Non-Thoracotomy Defibrillation Threshold", PACE 1993;16#4II:888.
Ideker R. E., Tang A. S. L., Frazier D. W. et al., "Ventricular Defibrillation: Basic Cocepts:, Cardiac Pacing and Electophysiology"3rd Ed., edited by El-Sherif N. & Samatt, W. B. Saunders Co. Philadelphia 1991;42:713-726.
Frazier D. W., Wolf P. D., Wharton J. M., et al., "A Stimulas Induced Critical Point: A Mechanism for Electrical Initiation of Re-Entry in Normal Canine Myocardium", J. of Clinical Investigation 1989;83:1039.
Shibata N., Chen P. S., Dixon E. G., et al., "Epicardial Activation After Unsuccessful Defibriallation Shocks in Dogs", American J. Physiology 1988;255:H902-H909.
Zhou X. Daubert J. P., Wolf P. D., et al., "Epicardial Mapping of Ventricular Defibrillation with Monophasic and Biphasic Shocks in Dogs":, Circulation Research 1993;72:145-160.
Jones J L, Jones R. E., "Decreased Defibrillator-Induced Dysfunction with Biphasic Rectangular Waveforms", American J. Physiology 1984:247:H792-796.
Niebauer M. J., Babbbs C. F., Geddes L. A., et al., "Efficacy and Safety of the Reciprocal Pulse Defibrillator Current Waveform", Medical and Biological Engineering and Computing 1984;22:28-31.
Kavanagh, K. M. et al., Comparison of the Internal Defibrillation Thresholds for Monophasic and Double and Single Capacitor Biphasic Waveforms, J. American College of Cardiology, 1989;14:1343-1349.
Feeser S. A., Tang A. S. L., Kavanagh K. M., et al., "Strength--Duration and Probability of Success Curves for Defibrillaion with Biphasic Waveforms" Circulation 1990;82:2128-2141.
Dixon E. F., "Improved Defibrillaion Thresholds with Large Contoured Epicardial Electrodes and Biphasic Waveforms", Circulation, 1987;76:1176-1184.
Chapman, et al., "Efficacy of Monophasic and Biphasic Truncated Exponential Shocks for Nonthoracotomy Internal Defibrillation in Dogs", J. American College of Cardiology, 1988;12:739-745.
Dillon S. M., "Synchronized Depolarized after Defibrillation Shocks: A Possible Component of the Defibrillation Process Demonstrated by Optical Recordings in Rabbit Heart", Circulation 1992;85:1865-1878.
Sweeney R. J., et al., "Ventricular Refractory Period Extension Caused by Defibrillation Shocks", Circulation 1990;82:965-972.
Belz M. K. et al., "Successful Defibrillation Prolongs Action Potential Durations in Humans", PACE 993;16:932.
Frasier D. W. et al., "Extracellular Field Required for Excitation in Three-Dimensional Anisotropic Canine Myocardium":, Circulation Research 1988;63:147-164.
Wessale J. L. et al., "Bipolar Catheter Defibrillation in Dogs using trapezoidal Waveforms of Various Tilts", J. Electrocardiology 1980;13(4):359-366.
Wharton J. M. et al., "Electrophysiological Effects in Vivo Monophasic and Biphasic Stimuli in Normal and Ifarcted Dogs", PACE 1990;13:1158-1172.
Niebauer M. J., Babbbs C. F., Geddes L. A., et al., "Efficacy and Safety of Defibrillation with Rectangular Waves of 2 to 20-milliseconds Duration", Crit. Care Medicine 1983;11#2:95-98.
Daubert J. P. et al., "Response of Relatively Refractory Canine Myocardium to Monophasic and Biphasic Shocks", Circulation 1991;84:2522-2538.
Zhou X. Daubert J. P., Wolf P. D., et al., "Prolongation of Repolorization Time by Electric Field Stimulation with Monophasic and Biphasic Shocks in Open Chest Dogs", Circulation Research 1991;68:1761-1767.
Yabe S., et al., "Conduction Disturbances Caused by High Current Density Electric Fields", Circulation Research 1990;66:1190-1203.
Fozzard H. A., "Membrane Capacity of the Cardiac Purkinje Fiber", J. physiol (Great Britian) 1966;182:255-267.
Weidmann S., "Electrical Constants of Trabecular Muscle from Mammalian Heart", J. Physiol (Great Britian) 1970;210:1041-1054.
Knisley S. B. et al., "Optical Measurement of Transmembrance Potential Changes During Electric Field Stimulation of Ventricular Cells", Circulation Research 1993;72:255-270.
January C. T. et al., "Early After Depolarization Newer Insights into Cellular Mechanisms":, J. Cardiovascular Electrophysiology 1990;1:161-169.
Shibata N. et al., "Epicardial Activa
Brewer James E.
Kroll Mark W.
Angeion Corporation
Kamm William E.
Schaetzle Kennedy J.
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