Neural stimulation system providing auto adjustment of stimulus output as a function of sensed impedance
First Claim
1. A method of providing therapy to a patient using a neurostimulation system that stores electrical parameter measurements in correspondence with different postural events, comprising:
- applying a stimulation energy output from the neurostimulation system to the patient;
measuring an electrical parameter in the patient;
comparing the measured electrical parameter to the stored electrical parameter measurements;
determining if a postural event in the patient has occurred based on the comparison; and
adjusting the applied stimulation energy output if the postural event has been determined to have occurred.
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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.
52 Citations
13 Claims
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1. A method of providing therapy to a patient using a neurostimulation system that stores electrical parameter measurements in correspondence with different postural events, comprising:
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applying a stimulation energy output from the neurostimulation system to the patient; measuring an electrical parameter in the patient; comparing the measured electrical parameter to the stored electrical parameter measurements; determining if a postural event in the patient has occurred based on the comparison; and adjusting the applied stimulation energy output if the postural event has been determined to have occurred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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, wherein the postural event is one of sitting to lying, standing to lying, sitting to standing, twisting the torso to one or the other side, standing to sitting, and running; and adjusting the applied stimulation energy output if the postural event has been determined to have occurred. - View Dependent Claims (10, 11, 12, 13)
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Specification