Impedance-based stimulation adjustment
First Claim
1. A system comprising:
- 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 receives at least one feedback indicator that indicates a perceived degree of intensity of the stimulation at each of a plurality of measured impedance values via the user interface, and determines a patient-specific relationship between a stimulation parameter and impedance based on the measured impedance values and the feedback indicators.
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Abstract
Techniques for adjusting stimulation are disclosed. A medical device measures an impedance associated with one or more electrodes, e.g., the impedance presented to the medical device by a total electrical circuit that includes the one or more electrodes, the conductors associated with the electrodes, and tissue proximate to the electrodes. The medical device stores at least one patient-specific relationship between impedance and a stimulation parameter, and adjusts the value of the stimulation parameter based on the measured impedance according to the relationship. The medical device may store multiple relationships, and select one the relationships based on, for example, an activity level of the patient, posture of the patient, or a current stimulation program or electrode combination used to deliver stimulation. By adjusting a stimulation parameter, such as amplitude, according to such a relationship, the stimulation intensity as perceived by the patient may be kept substantially constant.
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Citations
20 Claims
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1. 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 receives at least one feedback indicator that indicates a perceived degree of intensity of the stimulation at each of a plurality of measured impedance values via the user interface, and determines a patient-specific relationship between a stimulation parameter and impedance based on the measured impedance values and the feedback indicators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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delivering stimulation to a patient via electrodes; periodically measuring an impedance associated with the electrodes; receiving at least one feedback indicator that indicates a perceived degree of intensity of the stimulation at each of a plurality of measured impedance values from a user; and determining a patient-specific relationship between a stimulation parameter and impedance based on the measured impedance values and the feedback indicators. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A non-transitory computer-readable medium comprising instructions that cause a programmable processor to:
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control delivery of stimulation to a patient via electrodes; receive impedance measurements associated with the electrodes; receive at least one feedback indicator that indicates a perceived degree of intensity of the stimulation at each of a plurality of measured impedance values from a user; and determine a patient-specific relationship between a stimulation parameter and impedance based on the measured impedance values and the feedback indicators. - View Dependent Claims (17, 18, 19)
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20. 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 receiving at least one feedback indicator that indicates a perceived degree of intensity of the stimulation at each of a plurality of measured impedance values from a user; and means for determining a patient-specific relationship between a stimulation parameter and impedance based on the measured impedance values and the feedback indicators.
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Specification