Non-regular electrical stimulation patterns for improved efficiency in treating Parkinson's disease
Systems and methods for stimulation of neurological tissue generate stimulation trains with temporal patterns of stimulation, in which the interval between electrical pulses (the inter-pulse intervals) changes or varies 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 provide a lower average frequency. The systems and methods for stimulation of neurological tissue may be used to increase the efficacy of treatment in patients with Parkinson's Disease.
1. A method for stimulation of a targeted neurological tissue region comprising the steps of:
developing a first temporal pattern of stimulation using a model-based optimization technique to suppress pathological oscillatory activity in the basal ganglia, wherein the model-based optimization technique comprises a genetic algorithm or swarm intelligence algorithm to reduce at least one model-based measurement that serves as a proxy for a motor symptom of the animal; and
applying electrical current to a targeted neurological tissue region of the animal using an implantable pulse generator according to the first temporal pattern of stimulation, which comprises a repeating succession of a non-regular pulse train comprising a plurality of pulses having non-regular, differing inter-pulse intervals therebetween.
2. The method of claim 1 further comprising the steps of:
utilizing the model-based optimization technique to determine a second temporal pattern of stimulation, the second temporal pattern of stimulation comprising a repeating succession of a non-regular pulse train comprising a plurality of pulses having non-regular, non-random, differing inter-pulse intervals therebetween; and
applying electrical current to the targeted neurological tissue region of the animal using the pulse generator according to the second temporal pattern of stimulation to reduce at least one motor symptom of a neurological disease or disorder of the animal.
3. The method of claim 2 further comprising repeating the applying electrical current to the targeted neurological tissue region of the animal using the pulse generator according to the second temporal pattern of stimulation in succession, wherein the second temporal pattern of stimulation is different from the first temporal pattern of stimulation.
4. The method of claim 2 further comprising obtaining results of the first temporal pattern of stimulation or second temporal pattern of stimulation and utilizing a computer model to analyze results of the first temporal pattern of stimulation or second temporal pattern of stimulation.
5. The method of claim 4 , wherein analyzing results of the first temporal pattern of stimulation comprises quantitatively assessing the first temporal pattern of stimulation having an average frequency and at least one model-based measurement that serves as a proxy for a motor symptom of the animal.
6. The method of claim 5 , wherein analyzing results of the first temporal pattern of stimulation includes applying a cost function for the first temporal pattern of stimulation based upon the at least one model-based measurement that serves as a proxy for a motor symptom of the animal and frequency, the cost function weighting the at least one model-based measurement and frequency to minimize the at least one model-based measurement and frequency.
7. The method of claim 6 , wherein analyzing results of the first temporal pattern of stimulation includes calculating the cost function to evaluate the cost of the first temporal pattern of stimulation.
8. The method of claim 2 , wherein the second temporal pattern of stimulation reduces the at least one motor symptom of the neurological disease or disorder of the animal more than the first temporal pattern of stimulation.
9. The method of claim 8 , wherein the at least one motor symptom of the neurological disease or disorder is tremor.