NEURAL STIMULATION SYSTEM PROVIDING AUTO ADJUSTMENT OF STIMULUS OUTPUT AS A FUNCTION OF SENSED IMPEDANCE
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Abstract
A neural stimulation system automatically corrects or adjusts the stimulus magnitude (stimulation energy) in order to maintain a comfortable and effective stimulation therapy. Because the changes in impedance associated with the electrode-tissue interface can indicate obstruction of current flow and positional lead displacement, lead impedance can indicate the quantity of electrical stimulation energy that should be delivered to the target neural tissue to provide corrective adjustment. Hence, a change in impedance or morphology of an impedance curve may be used in a feedback loop to indicate that the stimulation energy needs to be adjusted and the system can effectively auto correct the magnitude of stimulation energy to maintain a desired therapeutic effect.
56 Citations
38 Claims
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1-24. -24. (canceled)
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25. A system, comprising:
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stimulation circuitry that delivers stimulation to a patient via electrodes; impedance measurement circuitry that periodically measures an impedance associated with the electrodes; a user interface; and a processor that identifies a plurality of postures of the patient, receives feedback for each of the postures regarding a perceived intensity of the stimulation via the user interface, associates measured impedances and received feedback with each of the postures, and determines a patient-specific relationship between a stimulation parameter and impedance for each of the postures based on the measured impedances and the feedback associated with each of the postures. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A method comprising:
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delivering stimulation to a patient via electrodes; periodically measuring an impedance associated with the electrodes; identifying a plurality of postures of the patient; receiving feedback for each of the plurality of postures of the patient regarding a perceived intensity of the stimulation from a user; associating measured impedances and received feedback with each of the postures; and determining a patient-specific relationship between a stimulation parameter and impedance for each of the postures based on the measured impedances and the feedback associated with each of the postures. - View Dependent Claims (33, 34, 35, 36, 37)
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38. A system, comprising:
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means for delivering stimulation to a patient via electrodes; means for periodically measuring an impedance associated with the electrodes; means for identifying a plurality of postures of the patient; means for receiving feedback for each of the postures regarding a perceived intensity of the stimulation from a user; means for associating measured impedances and received feedback with each of the postures; and means for determining a patient-specific relationship between a stimulation parameter and impedance for each of the postures based on the measured impedances and the feedback associated with each of the postures.
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Specification