Impedance-based stimulation adjustment
First Claim
1. A system comprising:
- stimulation circuitry that delivers electrical stimulation to a patient via electrodes;
a memory that stores a predetermined patient-specific relationship between a parameter of the stimulation and impedance;
impedance measurement circuitry that measures an impedance associated with the electrodes; and
a processor that adjusts the stimulation parameter based on the measured impedance according to the predetermined patient-specific relationship, and controls the stimulation circuitry to deliver the stimulation to the patient via the electrodes according to the adjusted parameter.
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Accused Products
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
22 Claims
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1. A system comprising:
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stimulation circuitry that delivers electrical stimulation to a patient via electrodes;
a memory that stores a predetermined patient-specific relationship between a parameter of the stimulation and impedance;
impedance measurement circuitry that measures an impedance associated with the electrodes; and
a processor that adjusts the stimulation parameter based on the measured impedance according to the predetermined patient-specific relationship, and controls the stimulation circuitry to deliver the stimulation to the patient via the electrodes according to the adjusted parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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measuring an impedance associated with electrodes that deliver electrical stimulation to a patient; and
adjusting a parameter of the stimulation based on the measured impedance according to a predetermined patient-specific relationship between the parameter and impedance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A system comprising:
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means for delivering stimulation to a patient;
means for measuring an impedance during the delivery of the stimulation; and
means for adjusting a parameter of the stimulation based on the measured impedance according to a predetermined patient-specific relationship between the parameter and impedance. - View Dependent Claims (21, 22)
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Specification