MRI-compatible implantable device
First Claim
1. A cardiac assist device comprising means for delivery of electrical current from said cardiac assist device to a heart wherein said means for delivery of electrical current is in electrical communication with said cardiac assist device and said heart,means for transmitting electrical current from said heart to said cardiac assist device wherein said means for transmitting electrical current is in electrical communication with said cardiac assist device and said heart, a control circuit adapted to be responsive to an activation source selected from the group consisting of an optical activation source, a direct current activation source, and combinations thereof and means for ceasing the flow of electrical current through a first circuit wherein said first circuit is selected from the group consisting of said means for delivery of electrical current, said means for transmitting electrical current, and combinations thereof, wherein said means for ceasing the flow of electrical current is controlled by said control circuit, wherein said means for ceasing the flow of electrical current is disposed between said cardiac assist device and said means for delivery of electrical current and said means for transmitting electrical current, and means for receiving pulsed radio frequency fields from an electromagnetic source external to said cardiac assist device, wherein, said means for receiving is selected from the group consisting of said means for delivery of electrical current, said means for transmitting electrical current, said means for ceasing the flow of electrical current, and combinations thereof, wherein said control circuit comprises an optical switch.
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Accused Products
Abstract
A cardiac assist device containing a device for connecting the cardiac assist device to a heart, for furnishing electrical impulses from the cardiac assist device to the heart, for ceasing the furnishing of electrical impulses to the heart, for receiving pulsed radio frequency fields, for transmitting and receiving optical signals, and for protecting the heart and the cardiac assist device from currents induced by the pulsed radio frequency fields. The cardiac assist device contains a control circuit comprised of a parallel resonant frequency circuit.
516 Citations
26 Claims
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1. A cardiac assist device comprising means for delivery of electrical current from said cardiac assist device to a heart wherein said means for delivery of electrical current is in electrical communication with said cardiac assist device and said heart,
means for transmitting electrical current from said heart to said cardiac assist device wherein said means for transmitting electrical current is in electrical communication with said cardiac assist device and said heart, a control circuit adapted to be responsive to an activation source selected from the group consisting of an optical activation source, a direct current activation source, and combinations thereof and means for ceasing the flow of electrical current through a first circuit wherein said first circuit is selected from the group consisting of said means for delivery of electrical current, said means for transmitting electrical current, and combinations thereof, wherein said means for ceasing the flow of electrical current is controlled by said control circuit, wherein said means for ceasing the flow of electrical current is disposed between said cardiac assist device and said means for delivery of electrical current and said means for transmitting electrical current, and means for receiving pulsed radio frequency fields from an electromagnetic source external to said cardiac assist device, wherein, said means for receiving is selected from the group consisting of said means for delivery of electrical current, said means for transmitting electrical current, said means for ceasing the flow of electrical current, and combinations thereof, wherein said control circuit comprises an optical switch.
- 13. A cardiac assist device comprising a pacing lead and a sensing lead wherein said pacing lead and sensing lead are in electrical communication with said cardiac assist device and a heart, further comprising control circuit which is adapted to be responsive to an activation source selected from the group consisting of an optical activation source, a direct current activation source, and combinations thereof, further comprising a resonant circuit wherein said resonant circuit controls the flow of electrical current through a first circuit wherein said first circuit is selected from the group consisting of said pacing lead, said sensing lead, and combinations thereof, wherein said resonant circuit is controlled by said control circuit, wherein said resonant circuit is disposed between said cardiac assist device and said pacing lead and said sensing lead, and an antenna adapted to receive pulsed radio frequency fields from an electromagnetic source external to said cardiac assist device, wherein said antenna is selected from the group consisting of said pacing lead, said sensing lead, said resonant circuit, and combinations thereof.
Specification