Method and system for controlling electrical conditions of tissue
AssigneeSaluda Medical Pty Ltd
InventorsPeter Scott Vallack Single, James Hamilton Wah
Life of this patent
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Abstract
An implantable device for controlling electrical conditions of body tissue. A feedback sense electrode and a compensation electrode are positioned proximal to the tissue to make electrical contact with the tissue. A feedback amplifier is referenced to ground, and takes as an input a feedback signal from the feedback sense electrode. The output of the feedback amplifier is connected to the compensation electrode. The feedback amplifier thus drives the neural tissue via the compensation electrode in a feedback arrangement which seeks to drive the feedback signal to ground, or other desired electrical value.
Claims17
A method for controlling electrical conditions of neural tissue, the method comprising:
- providing a plurality of implantable electrodes including a nominal feedback sense electrode, a nominal compensation electrode, a measurement electrode, and a reference electrode, the implantable electrodes being implanted proximal to the neural tissue and being in electrical contact with the neural tissue;
- applying an electrical stimulus to the neural tissue from at least one stimulus electrode of the plurality of electrodes;
- connecting a feedback signal from the feedback sense electrode to an input of a feedback amplifier, and referencing the feedback amplifier to a desired electrical value;
- connecting an output of the feedback amplifier to the compensation electrode such that the feedback amplifier drives the neural tissue via the compensation electrode to the desired electrical value;
- connecting the measurement electrode and the reference electrode to a measurement amplifier, wherein the measurement amplifier is different from the feedback amplifier;
- and
- obtaining a measurement of a neural response from the measurement amplifier while or after the feedback amplifier drives the neural tissue via the compensation electrode to the desired electrical value.
An implantable device for controlling electrical conditions of neural tissue, the device comprising:
- a plurality of electrodes including a feedback sense electrode, a compensation electrode, one or more stimulus electrodes, a measurement electrode, and a reference electrode, the electrodes being configured to be positioned proximal to the neural tissue to make electrical contact with the neural tissue;
- a stimulus source configured to provide an electrical stimulus to be delivered via the one or more stimulus electrodes to neural tissue;
- measurement circuitry comprising a measurement amplifier configured to amplify a neural signal sensed between the measurement electrode and the reference electrode;
- a feedback amplifier configured to be referenced to a desired electrical value and to take as an input a feedback signal from the feedback sense electrode, an output of the feedback amplifier being connected to the compensation electrode such that the feedback amplifier is configured to drive the neural tissue via the compensation electrode to the desired electrical value, wherein the feedback amplifier is different from the measurement amplifier;
- and
- a control unit configured to:
- control the stimulus source to provide an electrical stimulus to the neural tissue via the one or more stimulus electrodes;
- and
- control the measurement circuitry to obtain a measurement of a neural response from the amplified neural signal sensed between the measurement electrode and the reference electrode while or after the feedback amplifier drives the neural tissue via the compensation electrode to the desired electrical value.
Dependencies are inferred from the claim text.