Therapy programming based on evoked compound action potentials
This disclosure is directed to devices, systems, and techniques for controlling electrical stimulation. In some examples, a computing device includes a therapy-management application configured to assist a user to: capture a representative evoked compound action potential (ECAP) signal from a patient based; apply one or more filters to the representative ECAP signal to select one or more parameters of the representative ECAP signal; and control electrical stimulation therapy based at least in part on the one or more parameters.
1 . A method comprising:
determining, by processing circuitry, evoked compound action potential (ECAP) data indicative of a plurality of ECAPs based on signals sensed from a patient;
controlling, by the processing circuitry, a user interface to display the ECAP data over a time window;
identifying, by the processing circuitry, an ECAP amplitude in the ECAP data at a specific time in the time window, wherein the ECAP amplitude exceeds a threshold amplitude;
controlling, by the processing circuitry, the user interface to display a slidable marker that identifies the ECAP amplitude at the specific time over the displayed ECAP data, wherein the slidable marker is configured to be user-movable to different times within the time window; and
controlling, by the processing circuitry, the user interface to display an ECAP waveform corresponding to the ECAP amplitude identified by the slidable marker.
2 . The method of claim 1 , wherein the threshold amplitude comprises an absolute amplitude value or a predetermined multiple above a baseline-noise amplitude within the ECAP data.
3 . The method of claim 1 , further comprising:
determining whether the ECAP data satisfies minimum criteria for containing a usable ECAP of the plurality of ECAPs for determining subsequent ECAP data; and
displaying, via the user interface, an indication that the ECAP data includes the usable ECAP.
4 . The method of claim 1 , wherein the slidable marker is configured to be user-movable to the different times within the time window, and wherein the different times within the time window indicate respective ones of the plurality of ECAPs.
5 . The method of claim 1 , further comprising:
determining a change in an amplitude of an electrical stimulation signal associated with the plurality of ECAPs during the time window; and
outputting, via the user interface, an indication that the ECAP data should be re-captured.
6 . The method of claim 1 , further comprising displaying, by the processing circuitry via the user interface, a graphical user interface (GUI) of a therapy-management application, wherein the GUI comprises a plurality of screens comprising:
a select-device screen;
a select-flow screen;
an electrode-placement screen;
a capture-signal screen;
a review-signal screen; and
a configure-thresholds screen.
7 . The method of claim 6 , wherein the electrode-placement screen comprises:
a Program-1 widget enabling a user to select first placements for first sensing electrodes and first stimulation electrodes relative to a representation of a spinal cord of the patient, and a first stimulation amplitude for a first stimulation therapy program associated with the first stimulation electrodes;
a Program-2 widget enabling the user to select second placements for second sensing electrodes and second stimulation electrodes relative to the representation of the spinal cord, and a second stimulation amplitude for a second stimulation therapy program associated with the second stimulation electrodes; and
a “Setup” button for actuating the capture-signal screen.
8 . The method of claim 6 , wherein the review-signal screen comprises a signal-quality graph comprising:
the ECAP waveform;
a low-point detection window indicating a local minimum amplitude of the ECAP waveform;
a high-point detection window indicating a local maximum amplitude of the ECAP waveform; and
a vertical range indicating a difference between the local maximum amplitude and the local minimum, wherein the difference equals the identified ECAP amplitude within the ECAP data.
9 . The method of claim 6 , wherein the review-signal screen further comprises a plurality of filter options for modifying the ECAP waveform.
10 . The method of claim 9 , further comprising:
receiving selections for the plurality of filter options;
determining a filtered ECAP waveform based on the selections; and
configuring, based on the filtered ECAP waveform, ECAP parameters for determining subsequent ECAP data.
11 . A system comprising:
a memory; and
processing circuitry coupled to the memory and configured to:
determine evoked compound action potential (ECAP) data indicative of a plurality of ECAPs based on signals sensed from a patient;
control a user interface to display the ECAP data over a time window;
identify an ECAP amplitude in the ECAP data at a specific time in the time window, wherein the ECAP amplitude exceeds a threshold amplitude;
control the user interface to display a slidable marker that identifies the ECAP amplitude at the specific time over the displayed ECAP data, wherein the slidable marker is configured to be user-movable to different times within the time window; and
control the user interface to display an ECAP waveform corresponding to the ECAP amplitude identified by the slidable marker.
12 . The system of claim 11 , wherein the threshold amplitude comprises an absolute amplitude value or a predetermined multiple above a baseline-noise amplitude within the ECAP data.
13 . The system of claim 11 , wherein the processing circuitry is configure configured to:
determine whether the ECAP data satisfies minimum criteria for containing a usable ECAP of the plurality of ECAPs for determining subsequent ECAP data; and
control a display device to displaying, via the user interface, an indication that the ECAP data includes the usable ECAP.
14 . The system of claim 11 , wherein the slidable marker is configured to be user-movable to the different times within the time window, and wherein the different times within the time window indicate respective ones of the plurality of ECAPs.
15 . The system of claim 11 , wherein the processing circuitry is configure configured to:
determine a change in an amplitude of an electrical stimulation signal associated with the plurality of ECAPs during the time window; and
output, via the user interface, an indication that the ECAP data should be re-captured.
16 . The system of claim 11 , further comprising a display device, wherein the processing circuitry is configured to control the display device to display, via the user interface, a graphical user interface (GUI) of a therapy-management application, wherein the GUI comprises a plurality of screens comprising:
a select-device screen;
a select-flow screen;
an electrode-placement screen;
a capture-signal screen;
a review-signal screen; and
a configure-thresholds screen.
17 . The system of claim 16 , wherein the electrode-placement screen comprises:
a Program-1 widget enabling a user to select first placements for first sensing electrodes and first stimulation electrodes relative to a representation of a spinal cord of the patient, and a first stimulation amplitude for a first stimulation therapy program associated with the first stimulation electrodes;
a Program-2 widget enabling the user to select second placements for second sensing electrodes and second stimulation electrodes relative to the representation of the spinal cord, and a second stimulation amplitude for a second stimulation therapy program associated with the second stimulation electrodes; and
a “Setup” button for actuating the capture-signal screen.
18 . The system of claim 16 , wherein the review-signal screen comprises a signal-quality graph comprising:
the ECAP waveform;
a low-point detection window indicating a local minimum amplitude of the ECAP waveform;
a high-point detection window indicating a local maximum amplitude of the ECAP waveform; and
a vertical range indicating a difference between the local maximum amplitude and the local minimum, wherein the difference equals the identified ECAP amplitude within the ECAP data.
19 . The system of claim 16 , wherein the review-signal screen further comprises a plurality of filter options for modifying the ECAP waveform.
20 . A non-transitory, computer-readable medium comprising instructions that, when executed by a processor, cause the processor to:
determine evoked compound action potential (ECAP) data indicative of a plurality of ECAPs based on signals sensed from a patient;
control a user interface to display the ECAP data over a time window;
identify an ECAP amplitude in the ECAP data at a specific time in the time window, wherein the ECAP amplitude exceeds a threshold amplitude;
control the user interface to display a slidable marker that identifies the ECAP amplitude at the specific time over the displayed ECAP data, wherein the slidable marker is configured to be user-movable to different times within the time window; and
control the user interface to display an ECAP waveform corresponding to the ECAP amplitude identified by the slidable marker.