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1. (WO2017139243) METHOD AND SYSTEM FOR IMPROVING PROVISION OF ELECTRICAL STIMULATION
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CLAIMS

We Claim:

1. A method for providing electrical stimulation to a user, with an electrical stimulation device in communication with a controller, the method comprising:

• upon activation of the electrical stimulation device, transitioning the electrical stimulation device from a baseline state to a first impedance monitoring state;

• during the first impedance monitoring state, guiding, with the controller, an adjustment of a position of the electrical stimulation device at a head region of the user until a first impedance criterion associated with the first impedance monitoring state is satisfied;

• upon satisfaction of the first impedance criterion, transitioning the electrical stimulation device from the first impedance monitoring state to a stimulation regime that comprises a second monitoring state having a second criterion, wherein the stimulation regime provides an electrical stimulation session, according to a set of waveform features, to the user;

• upon detection of failure to satisfy the second criterion, transitioning the electrical stimulation device from the stimulation regime to the first impedance monitoring state at a first time point; and

• upon detecting that a third impedance criterion of the first impedance monitoring state is satisfied, transitioning the electrical stimulation device from the first impedance monitoring state to the stimulation regime at a second time point.

2. The method of Claim l, wherein transitioning to the first impedance monitoring state comprises producing a set of biphasic current pulses at the electrical stimulation device, and measuring impedance through a stimulation path of the electrical stimulation device by dividing total peak-to-peak voltage by total peak-to-peak current for each of the set of biphasic current pulses.

3. The method of Claim 2, wherein implementing the first impedance criterion comprises comparing impedance measurements across a subset of the set of biphasic current pulses to a threshold impedance value, and transitioning the electrical stimulation device from the first impedance monitoring state to the stimulation regime if impedance measurements are below the threshold impedance value for a duration of time.

4. The method of Claim 1, wherein implementing the first impedance monitoring state includes implementing a two-part hysteresis criterion for reducing cycling between at least one of the first impedance monitoring state, the second monitoring state, and the stimulation regime.

5. The method of Claim 4, wherein implementing the two-part hysteresis criterion comprises requiring that impedance initially fall below an initial threshold, and then remain under a second higher threshold for a duration of time.

6. The method of Claim 2, wherein implementing the first impedance criterion comprises comparing impedance measurements across a subset of the set of biphasic current pulses to a threshold impedance value, and transitioning the electrical stimulation device from the first impedance monitoring state to the stimulation regime if a specified number of sequential impedance measurements is below the threshold impedance value.

7. The method of Claim 1, wherein guiding, with the controller, the adjustment of the position of the electrical stimulation device at the head region of the user comprises implementing an optical position determining system operable to 1) facilitate creation of an internal virtual model of the head region and positions of the electrical stimulation device, and 2) determine an optimal position for the electrical stimulation device.

8. The method of Claim 1 wherein guiding, with the controller, the adjustment of the position of the electrical stimulation device at the head region of the user comprises visually guiding the user, with a display of the controller, to adjust the position of a head-mountable portion of the electrical stimulation device.

9. The method of Claim 1, wherein the first impedance monitoring state comprises measuring impedance with the electrical stimulation device according to a first technique, and wherein the second monitoring state comprises measuring impedance with the electrical stimulation device according to a second technique that is different from the first technique.

10. The method of Claim 9, wherein the first technique comprises dividing peak-to peak voltage by peak-to-peak current associated with a biphasic current pulse output by the electrical stimulation device, and wherein the second technique comprises at least one of: 1) dividing actual voltage by actual delivered current from the electrical stimulation device during the stimulation regime and 2) comparing attempted current to actual current delivered during the stimulation regime.

11. The method of Claim 1, wherein providing the electrical stimulation session comprises implementing a digital-to-analog converter (DAC) management component that automatically modulates at least one of the set of waveform features involving abrupt transitions in current output from the electrical stimulation device.

12. The method of Claim 11, wherein the DAC management component transforms a first waveform feature comprising a step increase in current output with a first linear ramp, and transforms a second waveform feature comprising a step decrease in current output with a second linear ramp.

13. The method of Claim 1, wherein implementing at least one of the first impedance monitoring state, the stimulation regime, and the second monitoring state comprises implementing a multiplexer with a set of switches operable to route undesired current outputs away from the user and to the system.

14. The method of Claim 1, wherein the first impedance criterion of the first impedance monitoring state has a first impedance value, and wherein the third impedance criterion of the first impedance monitoring state has a second impedance value greater than the first impedance value.

15. The method of Claim 1, wherein the first impedance criterion of the first impedance monitoring state has a first impedance value, and wherein the third impedance criterion of the first impedance monitoring state has a second impedance value equal to the first impedance value.

16. The method Claim 1, wherein transitioning the electrical stimulation device from the first impedance monitoring state to the stimulation regime comprises resuming the electrical stimulation session at a point of interruption associated with the first time point.

17. The method of Claim 1, wherein transitioning the electrical stimulation device from the first impedance monitoring state to the stimulation regime comprises calculating a duration of time between the first time point and the second time point, and resuming a modified version of the electrical stimulation session, the modified version determined based upon the duration of time.

18. A system for providing electrical stimulation to a head region of a user, the system comprising:

• an electrical stimulation device having a head-mountable portion and a set of electrodes reversibly coupled to the head-mountable portion, the electrical stimulation device operable between a baseline state, a first impedance monitoring state, and a stimulation regime having a second monitoring state, wherein:

o the first impedance monitoring state comprises a first set of impedance criteria and is enterable upon at least one of: a) detection of activation of the electrical stimulation device and b) failure to satisfy an impedance criterion of the second monitoring state, during the stimulation regime;

o the stimulation regime provides a stimulation session with a waveform definition to the head region of the user upon satisfaction of at least one of the first set of impedance criteria of the first impedance monitoring state; and

• a controller that transmits the stimulation waveform definition and guides adjustment of the set of electrodes at the head region of the user in cooperation with the first impedance monitoring state.

19. The system of Claim 18 wherein the head-mountable portion of the electrical stimulation device comprises a pair of ear pads coupled to a bridge that couples to and positions the set of electrodes across a motor cortex region of the user during operation.

20. The system of Claim 18, wherein the first impedance monitoring and the stimulation regime implement a first digital-to-analog management component that produces a set of biphasic current pulses for measuring impedance when current output is below a current threshold value.

21. The system of Claim 20, wherein the stimulation regime implements a second digital-to-analog management component that transforms waveform features associated with step changes in current to waveform features having a linear ramp in current.

22. The system of Claim 21, further including: a third digital-to-analog management component operable to perform at least one of: diverting stimulation current through an internal shorted path of the electrical stimulation device and a replacing a stimulation output of the waveform definition with a sham output in coordination with collecting impedance data.

23. The system of Claim 22, further including: a fourth digital-to-analog management component operable to scale stimulation output based upon user input at the controller.

24. The system of Claim 18, wherein the controller comprises at least one portion implemented in an application executing at a mobile computing device of the user and coupled to the electrical stimulation device.