MAGNETIC RESONANCE IMAGING INTERFERENCE IMMUNE DEVICE
First Claim
1. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
- a coil that generates a voltage due to a changing MRI electromagnetic field opposite to that which would be induced by the changing MRI electromagnetic field in the electrical lead without said coil so as to reduce voltages induced by the changing MRI electromagnetic field.
3 Assignments
0 Petitions
Accused Products
Abstract
A voltage compensation unit reduces the effects of induced voltages upon a device having a single wire line. The single wire line has balanced characteristic impedance. The voltage compensation unit includes a tunable compensation circuit connected to the wire line. The tunable compensation circuit applies supplemental impedance to the wire line. The supplemental impedance causes the characteristic impedance of the wire line to become unbalanced, thereby reducing the effects of induced voltages caused by changing magnetic fields.
68 Citations
93 Claims
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1. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
a coil that generates a voltage due to a changing MRI electromagnetic field opposite to that which would be induced by the changing MRI electromagnetic field in the electrical lead without said coil so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
a plurality of coils, at least one coil generating a voltage due to a changing MRI electromagnetic field such that a combination of voltages due to a changing MRI electromagnetic field provides a combined voltage that is opposite to the voltage which would be induced by the changing MRI electromagnetic field in the electrical lead without said plurality of coils so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
planar coils, at least one coil generating a voltage due to a changing MRI electromagnetic field such that a combination of voltages due to a changing MRI electromagnetic field provides a combined voltage that is opposite to the voltage which would be induced by the changing MRI electromagnetic field in the electrical lead without said planar coils so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (14, 15, 16, 17)
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18. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
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a plurality of coils, at least one coil generating a voltage due to a changing MRI electromagnetic field;
a sensor to measure a strength of voltages induced by the changing MRI electromagnetic field; and
a switching device, operatively connected to said sensor and plurality of coils, to operatively connect a number of said plurality of coils in response to the measured strength of voltages induced by the changing MRI electromagnetic field such that a combination of voltages due to a changing MRI electromagnetic field provides a combined voltage that is opposite to the voltage which would be induced by the changing MRI electromagnetic field in the electrical lead without said coils so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
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planar coils, at least one coil generating a voltage due to a changing MRI electromagnetic field;
a sensor to measure a strength of voltages induced by the changing MRI electromagnetic field; and
a switching device, operatively connected to said sensor and said coils, to operatively connect a number of said coils in response to the measured strength of voltages induced by the changing MRI electromagnetic field such that a combination of voltages due to a changing MRI electromagnetic field provides a combined voltage that is opposite to the voltage which would be induced by the changing MRI electromagnetic field in the electrical lead without said planar coils so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (25, 26, 27, 28)
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29. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
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a plurality of coils, at least one coil generating a voltage due to a changing MRI electromagnetic field;
a transceiver to receive a signal indicating a number of coils to be connected; and
a switching device, operatively connected to said transceiver and plurality of coils, to operatively connect a number of said plurality of coils in response to the received signal indicating the number of coils to be connected such that a combination of voltages due to a changing MRI electromagnetic field provides a combined voltage that is opposite to the voltage which would be induced by the changing MRI electromagnetic field in the electrical lead without said coils so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (30, 31, 32, 33, 34)
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35. An electrical lead for a medical device, the electrical lead capable of providing an electrical path to a desired tissue region, comprising:
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planar coils, at least one coil generating a voltage due to a changing MRI electromagnetic field;
a transceiver to receive a signal indicating a number of coils to be connected; and
a switching device, operatively connected to said transceiver and said coils, to operatively connect a number of said coils in response to the received signal indicating the number of coils to be connected such that a combination of voltages due to a changing MRI electromagnetic field provides a combined voltage that is opposite to the voltage which would be induced by the changing MRI electromagnetic field in said medical device electrical lead without said planar coils so as to reduce voltages induced by the changing MRI electromagnetic field. - View Dependent Claims (36, 37, 38, 39)
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40. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a RF choke, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said RF choke allowing a signal corresponding to a measured characteristic of the tissue region to pass therethrough. - View Dependent Claims (41, 42, 43)
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44. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a RF filter, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said RF filter allowing a signal corresponding to a measured characteristic of the tissue region to pass therethrough. - View Dependent Claims (45, 46, 47)
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48. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a notch filter, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said notch filter allowing a signal corresponding to a measured characteristic of the tissue region to pass therethrough. - View Dependent Claims (49, 50, 51)
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52. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a bandpass filter, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said bandpass filter allowing a signal corresponding to a measured characteristic of the tissue region to pass therethrough. - View Dependent Claims (53, 54, 55)
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56. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
an inductor, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said inductor allowing a signal corresponding to a measured characteristic of the tissue region to pass therethrough. - View Dependent Claims (57, 58, 59)
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60. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a RF choke, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said RF choke allowing a therapeutic signal to pass therethrough. - View Dependent Claims (61, 62, 63, 64)
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65. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a RF filter, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said RF filter allowing a therapeutic signal to pass therethrough. - View Dependent Claims (66, 67, 68, 69)
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70. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a notch filter, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said notch filter allowing a therapeutic signal to pass therethrough. - View Dependent Claims (71, 72, 73, 74)
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75. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a bandpass filter, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said bandpass filter allowing a therapeutic signal to pass therethrough. - View Dependent Claims (76, 77, 78, 79)
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80. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
an inductor, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said inductor allowing a therapeutic signal to pass therethrough. - View Dependent Claims (81, 82, 83, 84)
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85. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a tank circuit, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said tank circuit allowing a signal corresponding to a measured characteristic of the tissue region to pass therethrough. - View Dependent Claims (86, 87, 88)
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89. An electrical lead, comprising:
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an electrical strand to provide an electrical path between a tissue region and a medical device;
a tank circuit, operatively connected to said electrical strand, to significantly reduce currents induced by a changing MRI electromagnetic field in the electrical strand;
said tank circuit allowing a therapeutic signal to pass therethrough. - View Dependent Claims (90, 91, 92, 93)
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Specification