Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-03-24
1995-05-02
Cohen, Lee S.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 100
Patent
active
054115264
ABSTRACT:
The first embodiment of the present invention repositions the shunt thyristor used in the monophasic-waveform generator of the prior art so that it discharges the main capacitor through a series thyristor, thus increasing current through it briefly, rather than reducing current through it. The result of this arrangement is that the node between the series thyristor and the heart is pulled rapidly to a low voltage, causing the shunt switch to discharge the cardiac capacitance, as well as the main capacitance. The consequence is that discharging the cardiac capacitance requires a reversal of current in the heart, which enhances the heart-stimulating effect of the defibrillating waveform. The resulting true-voltage-pulse waveform has an efficacy approximating that of a biphasic waveform and is achieved with a circuit no more complex than that used to generate a monophasic waveform. A second and alternative embodiment of the present invention is a defibrillation system comprising a switching-bridge circuit, augmented by a zener diode and a rectifier diode, that is capable of delivering on demand any one of the waveforms known as monophasic, biphasic, and true-voltage-pulse waveforms.
REFERENCES:
patent: 3258013 (1966-06-01), Druz
patent: 4090519 (1978-05-01), Pantridge et al.
patent: 4821723 (1989-04-01), Baker, Jr. et al.
patent: 4821723 (1989-04-01), Baker, Jr. et al.
patent: 4850357 (1989-07-01), Bach, Jr.
patent: 4850357 (1989-07-01), Bach, Jr.
patent: 5083562 (1992-01-01), de Coriolis et al.
J. L. Prevost and F. Batelli, "Sur quelques effets des descharges electriques sur le couer des mammifers," Comptes rendus hebdomadaires des seances de l'Academie des sciences, vol. 129, p. 1267, 1899.
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. Stoeckle, "Transthoracic ventricular defibrillation with triangular and trapezoidal waveforms," Circ Res, vol. 19, pp. 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.
P. S. 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.
M. Mirowski, M. M. Mower, W. S. Staewen, et al., "Standby automatic defibrillator," Arch. Int. Med., vol. 126, pp. 158-161, Jul. 1970.
J. C. Schuder, H. Stoeckle, J. A. West et al., "Ventricular defibrillation in the dog with a bielectrode intravascular catheter," Arch. Int. Med., vol. 132, pp. 286-290, Aug. 1973.
M. Mirowski, M. M. Mower, V. L. Gott, et al, "Feasibility and effectiveness of low-energy catheter defibrillation in man," Circulation, vol. 47, pp. 79-85, Jan. 1973.
Adams Theodore P.
Brumwell Dennis A.
Kroll Mark W.
Supino Charles G.
Angeion Corporation
Cohen Lee S.
Parker Marianne
LandOfFree
Improved implantable defibrillator system for producing true-vol does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improved implantable defibrillator system for producing true-vol, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved implantable defibrillator system for producing true-vol will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1133923