US5456690A
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System and method for fractal pulse defibrillation
Assignee: Pacesetter Inc
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Filing: 1993-10-14
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Granted: 1995-10-10
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Expires: 2013-10-14
Abstract
Abstract The present invention provides a system and method for delivering a defibrillation waveform which is a fractal or multifractal pulse sequence. In one embodiment of the invention, a plurality of monophasic rectangular or truncated exponential pulses are delivered with fractal timing. Each subsequent pulse in the sequence has a lower voltage than the preceding pulse and the pulses have equal duration. This fractal pulse sequence is generated in response to a sensed arrhythmia and it is delivered using conventional leads to a patient's heart. A predetermined fractal pulse sequence is stored in programmable memory and may be modified by a patient's physician.
Inventors
- 👤 Minn Duong-Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:19
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3956; A61N1/3906
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
85 words
An implantable pulse generation system for treating an arrhythmic heart condition comprising: means for sensing the heart condition; energy storage means; means for charging said energy storage means; means for discharging said energy storage means; a pair of implantable electrodes coupled to said energy storage means for delivering energy pulses to a patient's heart; and control means coupled to said means for discharging for generating an irregular pulse sequence and delivering said sequence though said pair of electrodes in response to a sensed heart condition.
Claim 2
Dependent Claim
85 words
An implantable pulse generation system for treating an arrhythmic heart condition comprising: means for sensing the heart condition; energy storage means; means for charging said energy storage means; means for discharging said energy storage means; a pair of implantable electrodes coupled to said energy storage means for delivering energy pulses to a patient's heart; and control means coupled to said means for discharging for generating an irregular pulse sequence and delivering said sequence though said pair of electrodes in response to a sensed heart condition.
Claim 3
Dependent Claim
14 words
The system of claim 1 said irregular pulse sequence is a fractal pulse sequence.
Claim 4
Dependent Claim
23 words
The system of claim 1 and further including programmable memory means coupled to said control means for storing a predetermined irregular pulse sequence.
Claim 5
Independent Claim
42 words
A method of treating a heart arrhythmia using an implantable cardioverter/defibrillator comprising the steps of: sensing an arrhythmia condition; charging an energy storage means; delivering a fractal pulse sequence from said energy storage means to the heart through a pair of electrodes.
Claim 6
Independent Claim
42 words
A method of treating a heart arrhythmia using an implantable cardioverter/defibrillator comprising the steps of: sensing an arrhythmia condition; charging an energy storage means; delivering a fractal pulse sequence from said energy storage means to the heart through a pair of electrodes.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein each of said pulses has substantially the same duration.
Claim 8
Dependent Claim
27 words
The method of claim 4 wherein each subsequent pulse after an initial pulse of said pulse sequence is delivered at a lower voltage than the preceding pulse.
Claim 9
Dependent Claim
15 words
The method of claim 6 wherein each of said pulses is a truncated exponential pulse.
Claim 10
Dependent Claim
14 words
The method of claim 7 wherein each of said pulses has the same duration.
Claim 11
Independent Claim
39 words
A method of controlling ventricular fibrillation or tachycardia in a patient's heart using a defibrillator comprising the steps of sensing an arrhythmia condition and delivering a fractal sequence of energy pulses to the heart from a pair of electrodes.
Claim 12
Independent Claim
39 words
A method of controlling ventricular fibrillation or tachycardia in a patient's heart using a defibrillator comprising the steps of sensing an arrhythmia condition and delivering a fractal sequence of energy pulses to the heart from a pair of electrodes.
Claim 13
Dependent Claim
21 words
The method of claim 9 and further including the step of charging an energy storage means prior to delivering said pulses.
Claim 14
Dependent Claim
44 words
A pulse generation system for treating an arrhythmic heart condition comprising: energy storage means; energy delivery means including a pair of electrodes; and control means coupled to said energy delivery means for generating a fractal pulse sequence for delivery through said pair of electrodes.
Claim 15
Dependent Claim
44 words
A pulse generation system for treating an arrhythmic heart condition comprising: energy storage means; energy delivery means including a pair of electrodes; and control means coupled to said energy delivery means for generating a fractal pulse sequence for delivery through said pair of electrodes.
Claim 16
Dependent Claim
14 words
The system of claim 11 and further including means for sensing the heart condition.
Claim 17
Dependent Claim
40 words
The system of claim 12 wherein said system is adapted for implantation into a patient's body, said system further including a pair of implantable electrodes coupled to said energy delivery means for delivering said pulse sequence to the patient's heart.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |