Magnetic resonance imaging interference immune device
First Claim
Patent Images
1. A voltage compensation unit for reducing the effects of induced voltages upon a device to a safe level, comprising:
- a sensing circuit to sense voltages induced in conductive components of the device, the voltages being induced by changing magnetic fields; and
a compensation circuit, operatively connected to said sensing circuit and responsive thereto, to provide opposing voltages to the device to reduce the effects of induced voltages caused by changing magnetic fields.
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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.
189 Citations
49 Claims
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1. A voltage compensation unit for reducing the effects of induced voltages upon a device to a safe level, comprising:
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a sensing circuit to sense voltages induced in conductive components of the device, the voltages being induced by changing magnetic fields; and
a compensation circuit, operatively connected to said sensing circuit and responsive thereto, to provide opposing voltages to the device to reduce the effects of induced voltages caused by changing magnetic fields. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 49)
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10. A voltage compensation unit for reducing the effects of induced voltages upon a tissue invasive medical tool to a safe level, comprising:
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a sensing circuit to sense voltages induced in conductive components of the medical tool, the voltages being induced by changing magnetic fields;
a compensation circuit, operatively connected to said sensing circuit and responsive thereto, to provide opposing voltages to the medical tool to reduce the effects of induced voltages caused by changing magnetic fields; and
a connection device to provide an electrical connection between said sensing circuit and said compensation circuit and the medical tool. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A voltage compensation unit for reducing the effects of induced voltages upon a device to a safe level, comprising:
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a communication circuit, communicatively linked to a MRI system, to receive, from the MRI system, information associated with a start and end of an application of changing magnetic fields produced by the MRI system; and
a compensation circuit, operatively connected to said communication circuit and responsive thereto, to synchronize application of opposing voltages to the device with the start and end of the application of the changing magnetic fields produced by the MRI system, said opposing voltages reducing the effects of induced voltages caused by the changing magnetic fields. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A voltage compensation unit for reducing the effects of induced voltages upon a device to a safe level, comprising:
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a communication circuit, communicatively linked to a MRI system, to receive, from the MRI system, information associated with a start and end of an application of changing magnetic fields produced by the MRI system; and
a compensation circuit, operatively connected to said communication circuit and responsive thereto, to apply opposing voltages to the device, said opposing voltages reducing the effects of induced voltages caused by the changing magnetic fields. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A voltage compensation unit for reducing the effects of induced voltages upon a device having a single wire line, the single wire line having a balanced characteristic impedance, comprising:
a tunable compensation circuit, operatively connected to the wire line, to apply variable supplemental impedance to the wire line, said variable supplemental impedance causing the characteristic impedance of the wire line to become unbalanced, thereby reducing the effects of induced voltages caused by changing magnetic fields. - View Dependent Claims (45, 46, 47, 48)
Specification