Cardiac defibrillation
First Claim
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1. An apparatus for cardiac defibrillation which comprises an external circuit and an implantable circuit;
- the external circuit including an induction transmitting coil and signal generating means for applying radio frequency pulses of predetermined shape to the transmitting coil;
the radio frequency pulses having energy levels such as to cause defibrillation;
the implantable circuit including an induction receiving coil for receiving the defibrillation radio frequency pulses when the two coils are in proximity, and a rectification circuit having an input connected to the receiving coil and an output driving electrodes implantable in the heart, to transfer defibrillation signals to the heart.
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Abstract
A defibrillator connected by catheters (7) to the heart (6) has an external circuit (2, 12) connected to a passive implanted circuit (5) by transdermal induction via voils (3, 4). For atrial defibrillation, pulses of 3–4 J can be transmitted at about 7 MHz without damage, using an implanted coil (4) of 20 mm diameter.
9 Citations
12 Claims
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1. An apparatus for cardiac defibrillation which comprises an external circuit and an implantable circuit;
- the external circuit including an induction transmitting coil and signal generating means for applying radio frequency pulses of predetermined shape to the transmitting coil;
the radio frequency pulses having energy levels such as to cause defibrillation;
the implantable circuit including an induction receiving coil for receiving the defibrillation radio frequency pulses when the two coils are in proximity, and a rectification circuit having an input connected to the receiving coil and an output driving electrodes implantable in the heart, to transfer defibrillation signals to the heart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- the external circuit including an induction transmitting coil and signal generating means for applying radio frequency pulses of predetermined shape to the transmitting coil;
- 11. A method of cardiac defibrillation which comprises transmitting pulses of controlled shape and energy transdermally by high frequency magnetic induction from an external circuit, which pulses have energy levels such as to cause defibrillation, to a substantially passive implanted circuit which receives the defibrillation pulses and includes electrodes implantable in the heart, to transfer the defibrillation pulses to the heart.
Specification