Patent ID: 8103351
Filing Date: 2012-01-24
Classification: A61N

Abstract:
1. A system comprising: a therapy delivery device that delivers a therapy to a patient; a first activity sensor that generates a signal as a function of motion at a first location of a body of the patient; a second activity sensor that generates a signal as a function of motion at a second location of the body of the patient; and at least one processor that compares the signal generated by the first activity sensor and the signal generated by the second activity sensor to determine a relative motion of the second location of the patient relative to the first location of the patient, compares at least one of a difference in magnitude of the motions detected by the first activity sensor and the second activity sensor or a difference in directionality of the motions detected by the first activity sensor and the second activity sensor to determine at least one of a magnitude of the relative motion or a directionality of the relative motion, detects a condition of a movement disorder when at least one of the magnitude of the relative motion or the directionality of the relative module exceeds a threshold, and controls the therapy delivered to the patient based on the condition of the movement disorder, wherein the movement disorder is selected from a group consisting of: tremor, Parkinson's disease, spasticity, epilepsy and dystonia, and wherein each of the first and second activity sensors comprises an accelerometer.