Patent EP0281219A1 successfully refreshed from Google Patents.
EP0281219A1
Expired / Lapsed
EP
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Cardiac defibrillator
Assignee: Medtronic Inc
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Filing: 1988-01-14
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Granted: —
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Expires: 2008-01-14
Abstract
Abstract For terminating ventricular fibrillation the delivery of an asymmetric biphasic current pulse to three separate electrodes is provided. A first catheter (10) mounted electrode (16) is located in the apex of the right ventricle (RV). A second electrode (18) carried on the same catheter is located outside the atrium preferably in the superior vena cava (SVC). A third plate electrode (20) is located subcutaneously outside the chest cavity. Preferably, the SVC electrode (18) and the subcutaneous plate electrode (20) are electrically interconnected and an asymmetrical biphasic current pulse (32) is applied between this electrode pair and the RV electrode (16) to defibrillate the heart.
Inventors
- 👤 Rahul Mehra
- 👤 William Combs
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 09:34
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3956; A61N1/3906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
An implantable cardiac defibrillator comprising pulse generating means for generating a defibrillating pulse and terminal means including first and second terminals adapted to be connected to a plurality of implantable electrodes, said pulse generating means including energy storage means and circuit means arranged to discharge said energy storage means between said first and second terminals for a first predetermined time period, followed by reversing the polarity of said energy storage means with respect to said first and second terminals, then discharging said energy storage means between said first and second terminals for a second predetermined time period, forming an asymmetrical biphasic pulse waveform.
Claim 2
Dependent Claim
103 words
An implantable cardiac defibrillator comprising pulse generating means for generating a defibrillating pulse and terminal means including first and second terminals adapted to be connected to a plurality of implantable electrodes, said pulse generating means including energy storage means and circuit means arranged to discharge said energy storage means between said first and second terminals for a first predetermined time period, followed by reversing the polarity of said energy storage means with respect to said first and second terminals, then discharging said energy storage means between said first and second terminals for a second predetermined time period, forming an asymmetrical biphasic pulse waveform.
Claim 3
Dependent Claim
67 words
An implantable defibrillator as claimed in claim 1 wherein said circuit means is arranged to discharge said energy storage means between said first and second terminals from a first voltage to a second voltage; interrupt the discharge of said energy storage means; reverse the polarity of said first and second terminals; and resume discharge of said energy storage means from said second voltage to a third voltage.
Claim 4
Dependent Claim
19 words
An implantable defibrillator as claimed in claim 1 or 2 wherein said energy storage means comprises a single capacitor.
Claim 5
Dependent Claim
41 words
An implantable defibillator as claimed in claim 1, 2 or 3 including three electrodes connected to said terminal means, one of said electrodes being connected to said first terminal and the other two being connected together and to said second terminal.
Claim 6
Dependent Claim
69 words
An implantable defibrillator as claimed in claim 4 comprising an intravenous lead having a first said electrode at a distal end thereof and a second said electrode spaced apart from said first electrode, and a plate electrode of a construction suitable for subcutaneous implantation, said first electrode being connected to said first terminal and said second electrode and said plate electrode being connected together and to said second electrode.
Claim 7
Dependent Claim
36 words
An implantable defibrillator as claimed in claim 5 wherein said first electrode is adapted to be positioned at the apex of the right ventricle of a heart and the second electrode in the superior vena cava.
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