MRI COMPATIBLE ELECTRICAL LEAD FOR AN IMPLANTED ELECTRONIC MEDICAL DEVICE
First Claim
1. An electrical lead that is adapted for implantation in an animal and compatible with a magnetic resonance imaging scanner which responds to signals at a Larmor frequency of tissue in the animal, said electrical lead comprising:
- a first coil including at least one first insulated conductor wound along a length of the lead and the first coil having a first inductance and a first capacitance, wherein the first inductance and the first capacitance cause the first coil to act as a first parallel resonator tuned to the Larmor frequency; and
an electrically conductive layer extending around the first coil.
1 Assignment
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Accused Products
Abstract
An electrical lead, for implantation in an animal, is compatible with an MRI scanner. The electrical lead has a first plurality of coiled insulated wires forming an outer layer of conductors that has a first inductance and a first capacitance, which act as a first parallel resonator tuned to a Larmor frequency of tissue in the animal. The lead may have a second plurality of coiled insulated wires forming an inner layer of conductors within the outer layer of conductors. The second plurality of coiled insulated wires has a second inductance and a second capacitance that act as a second parallel resonator tuned to the Larmor frequency. Those parallel resonators mitigate signals at the Larmor frequency from traveling along the respective coil. An electrically conductive layer extends around the inner and/or outer layer of conductors, and a layer of a biologically compatible material forms the electrical lead'"'"'s exterior surface.
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Citations
30 Claims
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1. An electrical lead that is adapted for implantation in an animal and compatible with a magnetic resonance imaging scanner which responds to signals at a Larmor frequency of tissue in the animal, said electrical lead comprising:
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a first coil including at least one first insulated conductor wound along a length of the lead and the first coil having a first inductance and a first capacitance, wherein the first inductance and the first capacitance cause the first coil to act as a first parallel resonator tuned to the Larmor frequency; and an electrically conductive layer extending around the first coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An electrical lead that is adapted for implantation in an animal and compatible with a magnetic resonance imaging scanner which responds to signals at a Larmor frequency of tissue in the animal, said electrical lead comprising:
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a first plurality of coiled insulated wires wound in a first direction forming an outer layer of conductors, and having a first pitch that produces a first inductance and a first capacitance, wherein the first inductance and the first capacitance cause the first coil to act as a first parallel resonator tuned to the Larmor frequency; a second plurality of coiled insulated wires wound in a second direction forming an inner layer of conductors within the outer layer of conductors, and having a second pitch that produces a second inductance and a second capacitance, wherein the second inductance and the second capacitance cause the first coil to act as a second parallel resonator tuned to the Larmor frequency; an electrically conductive layer extends around the inner layer of conductors; and a layer of a material that is biologically compatible with tissue of the animal and extending around the outer layer of conductors and the electrically conductive layer. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification