| CPC A61N 1/36031 (2017.08) [A61N 1/36034 (2017.08)] | 16 Claims |
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1. A device comprising:
one or more electrodes adapted for application of a current signal to a skin surface of a subject;
a voltage or current source configured to generate the current signal for application via one or more of the electrodes, wherein power is output to the skin surface; and
a controller configured to modulate the power output to the skin surface, the controller comprising:
a monitor circuit configured to generate a feedback signal responsive to a change in the current signal or the power output to the skin surface, based at least in part on a voltage sensed proximate the one or more of the electrodes; and
a control circuit comprising a control device coupled to one or more of the electrodes and configured to modulate changes in the current signal, based on the feedback signal;
wherein the control device comprises a first terminal coupled to the one or more of the electrodes, a second terminal coupled to the monitor circuit, and a gate coupled to the control circuit;
wherein the control circuit comprises a level control coupled to the gate of the control device, wherein the level control defines a response curve of the control device based on a change in the voltage, the current signal, or the power output;
wherein the level control is configured to define the response curve between predetermined minimum and maximum power levels, based on the feedback signal from the monitor circuit;
wherein the level control is configured to lower the response curve to or toward the predetermined minimum power level, based on a change in the feedback signal; and
wherein the change in the feedback signal is defined by a difference between average values of first and second series of the feedback signal exceeding a predefined threshold.
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