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.
91 Citations
42 Claims
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1-24. -24. (canceled)
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25. A method of facilitating therapy to a patient, comprising:
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measuring an electrical parameter in the patient during a plurality of postural events by the patient; and storing the electrical parameter measurements in a neurostimulation system as a function of the postural events. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 42)
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35. A method of providing therapy to a patient using a neurostimulation system, comprising:
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applying a stimulation energy output from the neurostimulation system to the patient; measuring an electrical parameter in the patient; determining if a postural event in the patient has occurred based on the measured electrical parameter; and adjusting the applied stimulation energy output if the postural event has been determined to have occurred. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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Specification