EP0553864A2
Expired / Lapsed
EP
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Defibrillator waveform generator for generating waveform of long duration
Assignee: Cardiac Pacemakers Inc
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Filing: 1993-01-29
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Granted: —
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Expires: 2013-01-29
Abstract
Abstract An implantable defibrillator/cardioverter which generates a biphasic waveform having a duration of at least 15-80 msec and a small "tilt" between the leading edge and trailing edge voltages of each phase. In one embodiment, two capacitors are connected in parallel to create an effectively large capacitance to generate a slowly decaying waveform. In another embodiment, a high capacitance bipolar capacitor is used, which capacitance is at least 200 microFarads.
Inventors
- 👤 David K. Swanson
- 👤 James P. Nelson
- 👤 Douglas J. Lang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:45
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3956; A61N1/3906; A61N1/3912
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
104 words
A system for generating a defibrillation waveform in a defibrillator for discharge between electrode means, comprising: capacitor means having a capacitance of at least 200 microFarads; means for charging said capacitor means; switch means for connecting said capacitor means to said electrode means; and switch control means for controlling said switch means to connect said capacitor means to said electrode means for discharge via said electrode meant in a first polarity for a first phase of a biphasic waveform, and to connect said capacitor means to said electrode means in a polarity opposite said first polarity for a second phase of said biphasic waveform.
Claim 2
Dependent Claim
15 words
The system of claim 1, wherein the capacitor means has a capacitance of 200-1600 microFarads.
Claim 3
Dependent Claim
19 words
The system of claim 1, wherein the duration of said first and second phases totals at least 15 msec.
Claim 4
Dependent Claim
17 words
The system of claim 3, wherein the duration of said first and second phases totals 15-80 msec.
Claim 5
Dependent Claim
13 words
The system of claim 1, wherein said capacitor means comprises a single capacitor.
Claim 6
Dependent Claim
17 words
The system of claim 1, wherein said capacitor means comprises first and second capacitors connected in parallel.
Claim 7
Dependent Claim
17 words
The system of claim 1, wherein said capacitor means comprises a plurality of capacitors connected in series.
Claim 8
Dependent Claim
10 words
The system of claim 1, wherein said defibrillator is implantable.
Claim 9
Dependent Claim
20 words
The system of claim 8, wherein the electrode means comprises at least two electrodes implanted on or about the heart.
Claim 10
Dependent Claim
27 words
The system of claim 8, wherein the electrode means comprises one or more electrodes implanted on or about the heart and one or more electrodes implanted subcutaneously.
Claim 11
Dependent Claim
12 words
The system of claim 1, wherein the defibrillator is an external defibrillator.
Claim 12
Dependent Claim
20 words
The system of claim 11, wherein the electrode means comprises at least two electrodes implanted on or about the heart.
Claim 13
Dependent Claim
27 words
The system of claim 11, wherein the electrode means comprises one or more electrodes implanted on or about the heart and one or more electrodes implanted subcutaneously.
Claim 14
Dependent Claim
19 words
The system of claim 11, wherein the electrode means comprises at least two cutaneous electrodes placed on the body.
Claim 15
Independent Claim
108 words
A system for generating a defibrillation waveform in a defibrillator for discharge between electrode means, comprising: capacitor means; means for charging said capacitor means; switch means for connecting said capacitor means to said electrode means; and switch control means for controlling said switch means to connect said capacitor means to said electrode means for discharge via said electrodes in a first polarity for a first phase of a biphasic waveform, and to connect said capacitor means to said electrode means in a polarity opposite said first polarity for a second phase of said biphasic waveform, the duration of said first and second phases totalling at least 15 msec.
Claim 16
Dependent Claim
17 words
The system of claim 15, wherein the duration of said first and second phases totals 15-80 msec.
Claim 17
Dependent Claim
18 words
The system of claim 15, wherein the capacitor means has a capacitance which is at least 200 microFarads.
Claim 18
Dependent Claim
15 words
The system of claim 17, wherein the capacitance of the capacitor means is 200-1600 microFarads.
Claim 19
Dependent Claim
13 words
The system of claim 15, wherein said capacitor means comprises a single capacitor.
Claim 20
Dependent Claim
17 words
The system of claim 15, wherein said capacitor means comprises first and second capacitors connected in parallel.
Claim 21
Dependent Claim
17 words
The system of claim 15, wherein said capacitor means comprises a plurality of capacitors connected in series.
Claim 22
Dependent Claim
10 words
The system of claim 15, wherein the defibrillator is implantable.
Claim 23
Dependent Claim
20 words
The system of claim 22, wherein the electrode means comprises at least two electrodes implanted on or about the heart.
Claim 24
Dependent Claim
27 words
The system of claim 22, wherein the electrode means comprises one or more electrodes implanted on or about the heart and one or more electrodes implanted subcutaneously.
Claim 25
Dependent Claim
12 words
The system of claim 15, wherein the defibrillator is an external defibrillator.
Claim 26
Dependent Claim
20 words
The system of claim 25, wherein the electrode means comprises at least two electrodes implanted on or about the heart.
Claim 27
Dependent Claim
27 words
The system of claim 25, wherein the electrode means comprises one or more electrodes implanted on or about the heart and one or more electrodes implanted subcutaneously.
Claim 28
Dependent Claim
19 words
The system of claim 25, wherein the electrode means comprises at least two cutaneous electrodes placed on the body.
Claim 29
Independent Claim
34 words
A system for generating a defibrillation waveform in a defibrillator for discharge via electrode means, including a pulse generator comprising means for generating a biphasic waveform having a duration of 15 msec or greater.
Claim 30
Dependent Claim
20 words
The system of claim 29, wherein said electrode means comprises at least two electrodes implanted on or about the heart.
Claim 31
Dependent Claim
19 words
The system of claim 29, wherein said electrode means comprises at least two cutaneous electrodes placed on the body.
Claim 32
Dependent Claim
80 words
A defibrillation/cardioversion system comprising: defibrillation/cardioversion electrode means; means for sensing the activity of the heart; means for analyzing the activity of the heart and issuing a control signal to apply a therapeutic shock to the heart; and a pulse generator responsive to said control signal for generating a biphasic defibrillation/cardioversion waveform for discharge via said defibrillation/cardioversion electrodes, said biphasic defibrillation/cardioversion waveform comprised of first and second phases, the duration of said first and second phases totalling at least 15 msec.
Claim 33
Dependent Claim
21 words
The system of claim 32, wherein the defibrillation/cardioversion electrode means comprises at least two electrodes implanted on or about the heart.
Claim 34
Dependent Claim
28 words
The system of claim 32, wherein the defibrillation/cardioversion electrode means comprises one or more electrodes implanted on or about the heart and one or more electrodes implanted subcutaneously.
Claim 35
Dependent Claim
20 words
The system of claim 32, wherein the defibrillation/cardioversion electrode means comprises at least two cutaneous electrodes placed on the body.
Claim 36
Dependent Claim
33 words
A pulse generator for generating a defibrillation waveform in a defibrillator for discharge via electrodes, said pulse generator comprising means for generating a biphasic waveform having a duration of at least 15 msec.
Claim 37
Dependent Claim
29 words
A pulse generator for generating a defibrillation waveform in a defibrillator for discharge via electrodes, said pulse generator comprising capacitor means having a capacitance of at least 200 microFarads.
Claim 38
Dependent Claim
127 words
A pulse generator for generating a defibrillation waveform in a defibrillator for discharge via electrodes, comprising: capacitor means having a high capacitance and low leakage capable of storing a single charge for at least one day with leakage of no more than ten percent of the single charge; charging means for charging said capacitor means; discharging means for discharging the capacitor means via said electrodes to generate a biphasic defibrillation waveform comprising first and second phases; control means connected to said charging means and to said discharging means for controlling said charging means to charge the capacitor means months prior to a detection of an arrhythmia, and for controlling the discharging means to discharge the capacitor means multiple times from the single charge on the capacitor means.
Claim 39
Dependent Claim
20 words
The pulse generator of claim 38, wherein the duration of the first and second phases totals at least 15 msec.
Claim 40
Independent Claim
126 words
A system for generating a defibrillation waveform in a defibrillator for discharge between electrode means, comprising: capacitor means having a capacitance of at least 200 microFarads; means for charging said capacitor means; switch means for connecting said capacitor means to said electrode means; and switch control means for controlling said switch means to connect said capacitor means to said electrode means for discharge via said electrode means in a first polarity for a first phase of a biphasic waveform, and to connect said capacitor means to said electrode means in a polarity opposite said first polarity for a second phase of said biphasic waveform, the trailing edge voltage of said first phase being at least fifty percent of the leading edge voltage of the first phase.
References Cited (Backward Citations)
No citation records indexed.
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