ECAP-FILTERED NEUROMODULATION WAVEFORM MATCHING
Herein disclosed is applying a prescribed waveform protocol to a patient using one or more output electrodes in electrical communication with the patient, while capturing energy received from the patient using one or more input electrodes in electrical communication with the patient; determining an estimate of an electrically evoked compound action potential (ECAP) signal in the energy received from the patient; subtracting the estimate of the ECAP signal from the energy received from the patient to obtain an estimate of the prescribed waveform protocol being applied to the patient; comparing the estimate of the prescribed waveform protocol being applied to the patient with a selection of known waveform protocols to determine if the prescribed waveform protocol matches any of the selection; and in response to determining the prescribed waveform protocol being applied to the patient matches any of the selection, sending an indication a known waveform protocol is in use.
1 . A method comprising:
applying a prescribed waveform protocol ( 133 ) to a spinal cord ( 112 ) of a patient ( 115 ) using one or more output electrodes in electrical communication with the spinal cord ( 112 ) of the patient ( 115 ), while capturing energy received from the patient ( 115 ) using one or more input electrodes in electrical communication with the patient ( 115 ), using an SCS IPG ( 106 ) processor ( 200 );
determining an estimate of an electrically evoked compound action potential (ECAP) signal in the energy received from the patient ( 115 ), using the SCS IPG ( 106 ) processor ( 200 );
subtracting the estimate of the ECAP signal from the energy received from the patient ( 115 ) to obtain an estimate of the signal of the prescribed waveform protocol ( 133 ) being applied to the patient ( 115 ), using the SCS IPG ( 106 ) processor ( 200 );
comparing the estimated signal of the of the prescribed waveform protocol ( 133 ) being applied to the patient ( 115 ) with a selection of known waveform protocols ( 133 ) from a library of individually available known waveforms ( 121 ) to determine if the prescribed waveform protocol ( 133 ) being applied to the patient ( 115 ) matches any of the selection of known waveform protocols ( 133 ), using the SCS IPG ( 106 ) processor ( 200 ); and
in response to determining the prescribed waveform protocol ( 133 ) being applied to the patient ( 115 ) matches any of the selection of known waveform protocols ( 133 ), sending to an authorization server ( 127 ) an indication that a known waveform protocol ( 133 ) is in use, using the SCS IPG ( 106 ) processor ( 200 ).
2 . The method of claim 1 , wherein the method further comprises creating an artifact model of the ECAP signal based on the estimate of the ECAP signal, using the SCS IPG ( 106 ) processor ( 200 ).
3 . The method of claim 2 , wherein the subtracting further comprises subtracting the estimate of the ECAP signal from the energy received from the patient ( 115 ), using the artifact model.
4 . The method of claim 2 , wherein the method further comprises generating the artifact model during a calibration phase, using the SCS IPG ( 106 ) processor ( 200 ).
5 . The method of claim 4 , wherein the calibration phase further comprises transmitting a training signal through a communication channel, the communication channel comprising a signal path through the patient ( 115 ), the signal path between at least one output electrode and at least one input electrode, using the SCS IPG ( 106 ) processor ( 200 ).
6 . The method of claim 5 , wherein the method further comprises determining an impulse response of the communication channel, using the SCS IPG ( 106 ) processor ( 200 ).
7 . The method of claim 6 , wherein determining the impulse response of the communication channel further comprises receiving the training signal that has passed through the communication channel, using the SCS IPG ( 106 ) processor ( 200 ).
8 . The method of claim 6 , wherein determining the impulse response further comprises correlating the training signal as received through the communication channel with the training signal as before transmitting the training signal through the communication channel, using the SCS IPG ( 106 ) processor ( 200 ).
9 . The method of claim 1 , wherein the comparing further comprises comparing based on Fourier transforms, using the SCS IPG ( 106 ) processor ( 200 ).
10 . The method of claim 1 , wherein the comparing further comprises determining a correlation of the estimate of the prescribed waveform protocol ( 133 ) with a known waveform protocol ( 133 ) power spectrum, using the SCS IPG ( 106 ) processor ( 200 ).
11 . The method of claim 10 , wherein the method further comprises configuring a minimum correlation coefficient threshold value that must be reached to determine the estimate of the prescribed waveform protocol ( 133 ) matches any of the selection of known waveform protocols ( 133 ), using the SCS IPG ( 106 ) processor ( 200 ).
12 . The method of claim 10 , wherein the comparing further comprises a frequency-bin by frequency bin comparison of amplitudes in power spectra of the estimate of the prescribed waveform protocol ( 133 ) and the selection of known waveform protocols ( 133 ), using the SCS IPG ( 106 ) processor ( 200 ).
13 . The method of claim 10 , wherein the comparing further comprises determining the correlation in a predetermined passband width, using the SCS IPG ( 106 ) processor ( 200 ).
14 . The method of claim 1 , wherein the method further comprises receiving a digital indication from a waveform prescription deployment server ( 1625 ) to apply the prescribed waveform protocol ( 133 ) to the spinal cord ( 112 ) of the patient ( 115 ), using the SCS IPG ( 106 ) processor ( 200 ).
15 . The method of claim 1 , wherein the one or more input electrodes is in electrical communication with the spinal cord ( 112 ) of the patient ( 115 ).