ELECTRICAL IMPEDANCE IMAGING SYSTEMS
First Claim
1. An electrical channel having inbuilt current limiting, comprising:
- an electrode current source, comprising;
a voltage-to-current converter configured to receive an input voltage and output a corresponding output current;
a negative impedance converter operatively coupled to the voltage-to-current converter, wherein the negative impedance converter is configured to cancel an output impedance of the voltage-to-current converter, a parasitic impedance, or both; and
at least one passive current limiting component configured to limit the output current to a load below a threshold value.
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Accused Products
Abstract
An electrical channel having inbuilt current limiting is provided. The electrical channel includes an electrode current source. The electrode current source includes a voltage-to-current converter, a negative impedance converter, and at least one passive current limiting component. Further, the voltage-to-current converter is configured to receive an input voltage and output a corresponding output current. Moreover, the negative impedance converter is operatively coupled to the voltage-to-current converter, where the negative impedance converter is configured to cancel an output impedance of the voltage-to-current converter, a parasitic impedance, or both. Also, the passive current limiting component is configured to limit the output current to a load below a threshold value.
18 Citations
29 Claims
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1. An electrical channel having inbuilt current limiting, comprising:
an electrode current source, comprising; a voltage-to-current converter configured to receive an input voltage and output a corresponding output current; a negative impedance converter operatively coupled to the voltage-to-current converter, wherein the negative impedance converter is configured to cancel an output impedance of the voltage-to-current converter, a parasitic impedance, or both; and at least one passive current limiting component configured to limit the output current to a load below a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A reference current monitor configured to monitor a current at a reference electrode, comprising:
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a reference current-to-voltage converter; a low pass filter operatively coupled to the reference current-to-voltage converter; a high pass filter operatively coupled to the reference current-to-voltage converter; and a summator operatively coupled to the low and high pass filters. - View Dependent Claims (16)
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17. A monitoring and control unit, comprising:
one or more reference current monitors configured to monitor at least a portion of a reference current appearing at a reference electrode, wherein the one or more reference current monitors are configured to provide respective monitor output signals, and wherein each of the one or more reference current monitors comprises; a reference current-to-voltage converter; a low pass filter operatively coupled to the reference current-to-voltage converter; a high pass filter operatively coupled to the reference current-to-voltage converter; and a summator operatively coupled to the low and high pass filters. - View Dependent Claims (18, 19, 20, 21, 22)
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23. An electrical impedance imaging system for imaging a subject, comprising:
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a plurality of electrodes configured to be disposed on the subject; a reference electrode configured to be disposed on the subject; and a plurality of electrical channels, wherein each electrical channel of the plurality of channels is configured to be operatively coupled to a corresponding electrode of the plurality of electrodes, wherein each electrical channel of the plurality of electrical channels comprises inbuilt current limiting, and wherein each electrical channel of the plurality of electrical channels comprises; an electrode current source, comprising; a voltage-to-current converter configured to receive an input voltage and output a corresponding output current; a negative impedance converter operatively coupled to the voltage-to-current converter, wherein the negative impedance converter is configured to cancel an output impedance of the voltage-to-current converter, a parasitic impedance, or both; and at least one passive current limiting component operatively coupled to the voltage-to-current converter, the negative impedance converter, a load, or combinations thereof, and wherein the at least one passive current limiting component is configured to limit the output current to the load below a threshold value; and a processor unit comprising a physiological parameter extraction module. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification