Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-04-09
1994-08-02
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 138
Patent
active
053342194
ABSTRACT:
A implantable cardioverter-defibrillator employs, as a battery-saving design, a capacitance about nine time smaller than a typical defibrillation capacitor to provide an optimal-duration pulse of about 1 millisecond with a waveform based on the system time constants, i.e. the tissue resistance, the value of the capacitor and the heart's cardioversion chronaxie, a characteristic time associated with the stimulation of myocardial tissue. For higher-energy defibrillation, a second small capacitance is added to boost the energy.
REFERENCES:
patent: 4693253 (1987-09-01), Adams
patent: 4823796 (1989-04-01), Benson
patent: 4830006 (1989-05-01), Haluska
patent: 5014697 (1991-05-01), Pless et al.
patent: 5188105 (1993-02-01), Keimel
A. C. Guyton and J. Satterfield, "Factors concerned in defibrillation of the heart, particularly through the unopened chest," Am J. of Physiology, vol. 167, p. 81, 1951.
J. C. Schuder, G. A. Rahmoeller, and H. Stoecke, "Transthoracic ventricular defibrillation with triangular and trapezoidal waveforms," Circ Res, vol. 19, p. 689-694, Oct. 1966.
W. A. Tacker, L. A. Geddes, J. McFarlane, et al, "Optimum current duration for capacitor-discharge defibrillation of canine ventricles," J. Applied Physiology, vol. 27, #4, pp. 480-483, Oct. 1969.
J. C. Schuder, H. Stoeckle, J. A. Wes, et al. "Transthoracic ventricular defibrillation in the dog with truncated and untruncated exponential stimuli," IEEE Trans. Biom. Eng., vol. BME-18 #6, pp. 410-415, Nov. 1971.
G. Weiss, "Sur la possibilite de rendre comparable entre eux les appareils survant a l'excitation electrique," Arch. Ital. de Biol., vol. 35, pp. 413-446, 1901.
J. D. Bourland, W. A. Tacker, and L. A. Geddes, "Strength duration curves for trapezoidal waveforms of tilts for transchest difibrillation in animals," Med. Instr., vol. 12 #1, pp. 38-41, 1978.
J. D. Bourland, W. A. Tacker, L. A. Geddes et al, "Comparative efficacy of damped sine wave and square wave current for transchest ventricular difibrillation in animals," Medical Instrum., vol. 12, #1, pp. 38-41, 1978.
J. A. Pearce, J. D. Bourland, W. Neilsen, et al, "Myocardial stimulation with ultrashort duration curent pulses," PACE, vol. 5, pp. 52-58, Jan.-Feb. 1982.
P. D. Chen, P. D. Wolf, and F. J. Claydon, "The potential gradient field created by epicardial defibrillation electrodes in dogs," Circulation, vol. 74, pp. 626-635, Sep. 1986.
H. Fredericq, "Chronaxie: Testing excitability by means of a time factor," Physiol. Rev., vol. 8, pp. 501-545, 1928.
Angeion Corporation
Kamm William E.
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