Non-regular electrical stimulation patterns designed with a cost function for treating neurological disorders
Systems of and methods for stimulation of neurological tissue that may generate stimulation trains with temporal patterns of stimulation is shown and disclosed herein. The temporal patterns of stimulation may include intervals between electrical pulses (the inter-pulse intervals) that change or vary over time. Compared to conventional continuous, high rate pulse trains having regular (i.e., constant) inter-pulse intervals, the non-regular (i.e., not constant) pulse patterns or trains that embody features of the invention may provide a lower average frequency.
1. A neural stimulation device comprising:
a pulse generator configured to transmit a first temporal pattern of stimulation for application to neurological tissue having a first non-regular pulse train, the first non-regular pulse train including at least one first single pulse (first singlet) and embedded first multiple pulse groups (first n-lets), with non-regular, non-random inter-pulse intervals between the first singlet and first n-lets, as well as non-regular inter-pulse intervals within the first n-lets themselves adapted from applying a model-based optimization technique utilizing a first cost function, the first temporal pattern of stimulation having a first cost; and
wherein the pulse generator is configured to transmit a second temporal pattern of stimulation for application to neurological tissue having a second non-regular pulse train, the second non-regular pulse train including at least one second single pulse (second singlet) and embedded second multiple pulse groups (second n-lets), with non-regular, non-random inter-pulse intervals between the second singlet and second n-lets, as well as non-regular inter-pulse intervals within the second n-lets themselves, the second temporal pattern adapted from applying a second model-based optimization technique having a second cost function, whereby the second temporal pattern has a second cost, the second cost function different from the first cost function.
2. The neural stimulation device of claim 1 , wherein the pulse generator is adapted to apply at least one of the first and second temporal patterns of stimulation in repeating succession, whereby the first temporal pattern is different from the second temporal pattern.
3. The neural stimulation device of claim 2 , further comprising an output port configured to operatively attach at least one electrode.
4. The neural stimulation device of claim 3 , further comprising an electrode operatively attached to the output port.
5. The neural stimulation device of claim 4 , wherein the electrode is a pre-implanted lead.
6. The neural stimulation device of claim 1 , wherein the model-based optimization technique includes applying a genetic algorithm.
7. A method for stimulation of a targeted neurological tissue region comprising the steps of:
applying electrical current to a targeted neurological tissue region of an animal using a pulse generator according to a first non-regular pulse train including at least one first single pulse (first singlet) and embedded first multiple pulse groups (first n-lets), with non-regular, non-random inter-pulse intervals between the first singlet and first n-lets, as well as non-regular inter-pulse intervals within the first n-lets themselves;
analyzing results of the first non-regular pulse train utilizing a first cost function to determine a first cost of the non-regular pulse train;
applying a model-based optimization technique utilizing a second cost function and determining a second non-regular pulse train including at lease one second single pulse (second singlet) and embedded second multiple pulse groups (second n-lets), with non-regular, non-random inter-pulse intervals between second singlet and second n-lets, as well as non-regular inter-pulse intervals within the second n-lets themselves, the second non-regular pulse train having a second cost different from the first cost; and
applying electrical current to the targeted neurological tissue region of the animal using the pulse generator according to the second non-regular pulse train.
8. The method of claim 7 , further comprising the step of repeating the applying electrical current to the targeted neurological tissue region of the animal using the pulse generator according to the second non-regular pulse train in succession, wherein the second non-regular pulse train is different from the first non-regular pulse train.
9. The method of claim 7 , wherein the model-based optimization technique includes applying a genetic algorithm.
10. The method of claim 7 , further comprising the step of operatively connecting at least one electrode to the pulse generator.
11. The method of claim 10 , wherein the at least one electrode is an existing implanted lead.
12. The method of claim 7 , wherein the step of analyzing results of the first non-regular pulse train includes quantitatively assessing the first non-regular pulse train having an average frequency (f) and an error fraction (E) indicating how voltage output of thalamic cells correspond to timing of inputs.
13. The method of claim 12 , wherein the step of analyzing results of the first non-regular pulse train includes determining the first cost function for the first non-regular pulse train based upon E and f, the first cost function weighting E and f to minimize E and f at a clinically beneficial cost.
14. A neural stimulation device comprising:
a pulse generator configured to apply a first non-regular pulse train, having at least one first singlet and at least one first multiple pulse group having, for each multiple pulse group, two or more pulses spaced apart by a first inter-pulse interval that is non-random and non-regular, the first non-regular pulse train including a first cost function quantitatively assessing the first non-regular pulse train having an average frequency (f) and an error fraction (E);
wherein the pulse generator is configurable to apply a second non-regular pulse train, having at least one second singlet and at least one second multiple pulse group having, for each multiple pulse group, two or more pulses spaced apart by a second inter-pulse interval that is non-random and non-regular, the second non-regular pulse trail based upon an analysis of the first cost function; and
at least one output configured to operatively connect with at least one electrode.
15. The neural stimulation device of claim 14 , wherein the analysis of the first non-regular pulse train includes applying a model-based optimization technique determining the second non-regular pulse train, which is different from the first non-regular pulse train.
16. The neural stimulation device of claim 15 , wherein the model-based optimization technique includes applying a genetic algorithm whereby the second non-regular pulse train has an improved efficacy over the first non-regular pulse train.
17. The neural stimulation device of claim 14 , further comprising at least one electrode operatively coupled with the at least one output.
18. The neural stimulation device of claim 17 , wherein the at least one electrode is an existing implanted lead.
19. The neural stimulation device of claim 14 , wherein the pulse generator applies the second non-regular pulse train in succession.
20. The neural stimulation device of claim 1 , wherein the first cost function has a higher average frequency than the second cost function.
21. The neural stimulation device of claim 1 , wherein the second cost function has a higher efficacy in treating a neurological condition than the first cost function.
22. The neural stimulation device of claim 1 , wherein the first cost is a measure of performance of the first temporal pattern of stimulation.
23. The neural stimulation device of claim 1 , wherein the first cost function is minimized by the model-based optimization technique.
24. The neural stimulation device of claim 23 , wherein the first cost function includes at least one of efficacy or efficiency of the first temporal pattern of stimulation.
25. The neural stimulation device of claim 1 , wherein the second cost is a measure of performance of the second temporal pattern of stimulation.
26. The neural stimulation device of claim 1 , wherein the second cost function is minimized by the model-based optimization technique.
27. The neural stimulation device of claim 26 , wherein the first cost function includes at least one of efficacy or efficiency of the second temporal pattern of stimulation.
28. The neural stimulation device of claim 1 , wherein the second cost function has at least one performance attribute differently weighted than the first cost function.
29. The neural stimulation device of claim 1 , wherein the second model-based optimization technique includes applying a genetic algorithm.
30. The neural stimulation device of claim 1 , wherein the first model-based optimization technique is equivalent to the second model-based optimization technique.
31. The method of claim 7 , wherein the step of analyzing results of the first non-regular pulse train includes applying a model-based proxy for a symptom of a neurological disorder or disease.
32. The method of claim 7 , wherein the first cost function is a measure of performance of the first non-regular, non-random pulse train.
33. The method of claim 32 , wherein the measure of performance includes measure of efficacy or efficiency of the first non-regular, non-random pulse train.
34. The method of claim 33 , wherein the measure of efficiency of the first non-regular, non-random pulse train includes measure of the average frequency of the first non-regular, non-random pulse train.
35. The method of claim 34 wherein the measure of efficacy of the first non-regular, non-random pulse train includes quantitatively assessing the first non-regular pulse train having an average frequency (f) and an error fraction (E) indicating how voltage output of thalamic cells correspond to timing of inputs.
36. The method of claim 7 , wherein the second cost function is a measure of performance of the second non-regular, non-random pulse train.
37. The method of claim 36 , wherein the measure of performance includes measure of efficacy or efficiency of the second non-regular, non-random pulse train.
38. The method of claim 37 , wherein the measure of efficiency of the second non-regular, non-random pulse train includes measure of the average frequency of the second non-regular, non-random pulse train.
39. The method of claim 38 , wherein the measure of efficacy of the second non-regular, non-random pulse train includes quantitatively assessing the second non-regular pulse train having an average frequency (f) and an error fraction (E) indicating how voltage output of thalamic cells correspond to timing of inputs.
40. The neural stimulation device of claim 14 , wherein the second non-regular pulse train includes a second cost function different from the first cost function.
41. The neural stimulation device of claim 14 , wherein the second cost function relates to improved efficacy over the first cost function.
42. The neural stimulation device of claim 14 , wherein the second cost function relates to improved energy efficiency over the first cost function.