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Neural stimulation system providing auto adjustment of stimulus output as a function of sensed impedance

  • US 7,742,823 B2
  • Filed: 05/10/2007
  • Issued: 06/22/2010
  • Est. Priority Date: 02/12/2002
  • Status: Active Grant
First Claim
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1. A method of neural stimulation using a neurostimulator, the method comprising:

  • correlating impedance changes with predicted stimulation energy adjustments;

    initially storing the correlated measured impedance changes and predicted stimulation energy adjustments in a look-up table;

    measuring a change in impedance indicative of variations in the coupling efficiency between stimulation energy output from the neurostimulator and neural tissue;

    subsequently analyzing the stored correlated measured impedance changes and predicted stimulation energy adjustments to determine the predicted stimulation energy adjustment correlated to the measured impedance change; and

    automatically adjusting the stimulation energy output from the neurostimulator accordance with the determined stimulation energy adjustment to compensate for the variations in the coupling efficiency by maintaining the stimulation energy delivered to the neural tissue at a set level.

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