Systems and methods for enhancing or optimizing neural stimulation therapy for treating symptoms of parkinson's disease and/or other movement disorders
Systems and methods for treating a neurological disorder comprising determining a first set of neural stimulation parameters capable of treating a first subset of symptoms, determining a second set of neural stimulation parameters capable of treating a second subset of symptoms, and applying a neural stimulation therapy based upon the first set of neural stimulation parameters and the second set of neural stimulation parameters to the patient. The first set of neural stimulation parameters can include electrical stimulation at a first frequency, and the second set of neural stimulation parameters can include electrical stimulation at a second frequency. In other embodiments, a treatment method comprises applying a first neural stimulation therapy to the patient in a continuous or generally continuous manner during a first time interval, and applying a second neural stimulation therapy to the patient in a noncontinuous or interrupted manner following the first time interval.
1. A method of treating Parkinson's disease (PD) in a patient, the method comprising:
generating electrical stimulation pulses from a pulse generator, the electrical stimulation pulses comprising a plurality of groups of pulses occurring according to a burst frequency, wherein (i) multiple pulses are generated within each respective group according to a pulse repetition frequency, (ii) adjacent groups within the plurality of groups are spaced apart from each other in time with a substantially quiescent period, and (iii) the generating is repeated for a limited number of hours per day such that the generating is performed at most for 50% of a respective day, wherein each group in the plurality of groups is less than three (3) seconds and each quiescent period is less than one (1) minute; and
applying the plurality of groups of pulses to a target neuronal population of the patient using one or more electrodes of one or more electrical leads implanted within a deep brain location of the patient, wherein (i) the one or more electrodes are within the globus pallidus internalis (GPi) or within the subthamalic nucleus (STN), and (ii) the applying causes the patient to experience a change in neuronal circuitry from a disease state that results in reduced PD-related tremor in the patient while the electrical stimulation pulses are not applied.
2. The method of claim 1 wherein the applying causes the patient to experience improved motor functioning while the electrical stimulation pulses are applied.
3. The method of claim 1 wherein the pulse frequency is adapted to affect at least one motor symptom of PD in the patient.
4. The method of claim 1 wherein improved motor functioning is experienced by the patient for at least thirty minutes without stimulation after the applying is performed.
5. The method of claim 4 wherein the patient experiences reduced tremor for at least thirty minutes without stimulation after the applying is performed.
6. The method of claim 1 wherein respective groups of multiple pulses are applied to different electrodes of multiple electrodes at different points in time according to a pre-defined temporal distribution.
7. The method of claim 1 wherein the generating comprises:
cycling between (i) an on-period in which the groups of electrical pulses are generated for a first defined amount of time and (ii) an off-period in which electrical pulses are not generated for a second defined amount of time, wherein the first and second amounts of time are approximately equal.
8. The method of claim 1 wherein the groups of pulses comprise monopolar pulses.
9. The method of claim 1 wherein the groups of pulses comprise biphasic, charge-balanced pulses.
10. The method of claim 1 wherein the change in neuronal circuitry results in a reduction in a neuronal output of the GP of the patient.