Responsive electrical stimulation for movement disorders
First Claim
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1. An implantable neurostimulator for treating a patient experiencing a movement disorder comprising:
- a sensor interface for receiving a first signal from a first sensor configured to sense electrical activity of the brain and a second signal from a second sensor configured to sense motion of the patient;
a detection subsystem for analyzing the first signal and the second signal, the detection subsystem configured to;
measure a frequency of the first signal and a frequency of the second signal,calculate a frequency offset corresponding to the difference between the frequency of the first signal and the frequency of the second signal,compare the frequency offset to a frequency criterion,measure a phase of the first signal and a phase of the second signal;
calculate a phase offset corresponding to the difference between the phase of the first signal and the phase of the second signal,compare the phase offset to a phase criterion, anddetect a tremor event when both the frequency criterion and the threshold criterion are satisfied; and
a stimulation subsystem configured to deliver a treatment to the patient from the neurostimulator.
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Abstract
An implantable neurostimulator system for treating movement disorders includes a sensor, a detection subsystem capable of identifying episodes of a movement disorder by analyzing a signal received from the sensor, and a therapy subsystem capable of supplying therapeutic electrical stimulation to treat the movement disorder. The system treats movement disorders by detecting physiological conditions characteristic of an episode of symptoms of the movement disorder and selectively initiating therapy when such conditions are detected.
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Citations
18 Claims
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1. An implantable neurostimulator for treating a patient experiencing a movement disorder comprising:
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a sensor interface for receiving a first signal from a first sensor configured to sense electrical activity of the brain and a second signal from a second sensor configured to sense motion of the patient; a detection subsystem for analyzing the first signal and the second signal, the detection subsystem configured to; measure a frequency of the first signal and a frequency of the second signal, calculate a frequency offset corresponding to the difference between the frequency of the first signal and the frequency of the second signal, compare the frequency offset to a frequency criterion, measure a phase of the first signal and a phase of the second signal; calculate a phase offset corresponding to the difference between the phase of the first signal and the phase of the second signal, compare the phase offset to a phase criterion, and detect a tremor event when both the frequency criterion and the threshold criterion are satisfied; and a stimulation subsystem configured to deliver a treatment to the patient from the neurostimulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for treating a movement disorder in a human patient with an implantable neurostimulator comprising:
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receiving a first signal from a first sensor configured to sense electrical activity of the brain; receiving a second signal from a second sensor configured to sense motion of the patient; analyzing the first signal and the second signal to determine whether a tremor characteristic of an episode of the movement disorder is occurring, wherein analyzing the first and second signals comprises; measuring a frequency of the first signal and a frequency of the second signal, calculating a frequency offset corresponding to the difference between the frequency of the first signal and the frequency of the second signal, comparing the frequency offset to a frequency criterion, measuring a phase of the first signal and a phase of the second signal; calculating a phase offset corresponding to the difference between the phase of the first signal and the phase of the second signal, comparing the phase offset to a phase criterion, and detecting a tremor event when both the frequency criterion and the threshold criterion are satisfied; and delivering a treatment to the patient from the neurostimulator. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification