Non-magnetic high voltage charging system for use in cardiac stimulation devices
First Claim
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1. An external cardiac defibrillator comprising:
- defibrillation electrode pads configured to make external electrical contact with a torso configured to deliver the cardiac defibrillation shock to the torso; and
an electrical circuit including an electrical storage element, inductors including only air core inductors, and a piezoelectric transformer arranged to charge the electrical storage element to a voltage effective for delivering a cardiac defibrillation shock, the electrical circuit configured to discharge the electrical storage element across the defibrillation electrode pads to deliver a cardiac defibrillation shock to the defibrillation electrode pads;
wherein the cardiac defibrillator does not contain any ferromagnetic material and is disposed externally of a patient.
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Abstract
A cardiac defibrillator comprises electrical wires or terminals (24) connected with or configured to connect with defibrillation electrode pads (22), and an electrical circuit (32, 32a, 32b) including an electrical storage element (52) and a piezoelectric transformer (50) arranged to charge the electrical storage element to a voltage effective for delivering a cardiac defibrillation shock. The electrical circuit is configured to discharge the electrical storage element across the electrical wires or terminals to deliver a cardiac defibrillation shock to the electrical wires or terminals.
24 Citations
13 Claims
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1. An external cardiac defibrillator comprising:
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defibrillation electrode pads configured to make external electrical contact with a torso configured to deliver the cardiac defibrillation shock to the torso; and an electrical circuit including an electrical storage element, inductors including only air core inductors, and a piezoelectric transformer arranged to charge the electrical storage element to a voltage effective for delivering a cardiac defibrillation shock, the electrical circuit configured to discharge the electrical storage element across the defibrillation electrode pads to deliver a cardiac defibrillation shock to the defibrillation electrode pads; wherein the cardiac defibrillator does not contain any ferromagnetic material and is disposed externally of a patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An external cardiac defibrillator comprising:
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defibrillation electrode pads configured to make external electrical contact with a torso configured to deliver a cardiac defibrillation shock to the torso; an electrical circuit including an electrical storage element, inductors including only air core inductors, and a piezoelectric transformer that does not contain any magnetic material and is arranged to charge the electrical storage element to a voltage effective for delivering a cardiac defibrillation shock, the electrical circuit configured to discharge the electrical storage element across the defibrillation electrode pads to deliver a cardiac defibrillation shock to the defibrillation electrode pads; and automatic control circuitry configured to (i) determine a cardiac state based on an electrocardiographic (ECG) signal received at the defibrillation electrode pads and (ii) operate the electrical circuit to deliver a cardiac defibrillation shock to the defibrillation electrode pads conditional upon the determined cardiac state being indicative of cardiac arrest, wherein the cardiac defibrillator defines an automated external defibrillator (AED); wherein the external cardiac defibrillator does not contain any magnetic material and is disposed externally of a patient. - View Dependent Claims (10, 11, 12)
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13. A magnetic resonance facility comprising:
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a magnetic resonance scanner; a shielded room containing the magnetic resonance scanner; and an external cardiac defibrillator disposed in the shielded room the external cardiac defibrillator including; defibrillation electrode pads configured to make external electrical contact with a torso configured to deliver the cardiac defibrillation shock to the torso, and an electrical circuit including an electrical storage element, inductors including only aft core inductors, and a piezoelectric transformer arranged to charge the electrical storage element to a voltage effective for delivering a cardiac defibrillation shock, the electrical circuit configured to discharge the electrical storage element across the defibrillation electrode pads to deliver a cardiac defibrillation shock to the defibrillation electrode pads; wherein the external cardiac defibrillator does not contain any magnetic material and is disposed externally of a patient.
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Specification