Patient posture determination and stimulation program adjustment in an implantable stimulator device using impedance fingerprinting
First Claim
1. An implantable stimulator device, comprising:
- a plurality of electrodes configured to provide electrical stimulation to a patient; and
circuitry comprising an impedance algorithm configured to determine an impedance between a plurality of combinations of the electrodes at a plurality of different frequencies during quiet periods when the electrical stimulation at a first frequency is not occurring, and to determine a measured impedance fingerprint from the determined impedances,wherein the impedance algorithm is further configured to select a stimulation program to be provided to the electrodes in accordance with the measured impedance fingerprint.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and circuitry for determining an implanted-neurostimulator patient'"'"'s position, and adjusting a situation program delivered by the neurostimulator based on the determined position, is disclosed. Impedance measurements of the patient'"'"'s tissue are taken at the neurostimulator'"'"'s electrodes, which measurements can comprise complex impedance measurements (magnitude and phase) taken at different frequencies. Such impedance measurements, which can be taken interleaved with stimulation therapy, are used to determine an “impedance fingerprint.” This fingerprint can be compared to other known fingerprints stored in the IPG, which known fingerprints are associated with particular stimulation programs. When a measured fingerprint matches one stored in the IPG, the stimulation program associated with the stored fingerprint is automatically used for patient therapy. As different measured fingerprints are encountered, the IPG can learn and store a new stimulation program for such fingerprint by remembering stimulation parameters selected by the patient when such fingerprint is encountered.
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Citations
38 Claims
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1. An implantable stimulator device, comprising:
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a plurality of electrodes configured to provide electrical stimulation to a patient; and circuitry comprising an impedance algorithm configured to determine an impedance between a plurality of combinations of the electrodes at a plurality of different frequencies during quiet periods when the electrical stimulation at a first frequency is not occurring, and to determine a measured impedance fingerprint from the determined impedances, wherein the impedance algorithm is further configured to select a stimulation program to be provided to the electrodes in accordance with the measured impedance fingerprint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable stimulator device, comprising:
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a plurality of electrodes configured to provide electrical stimulation to a patient; circuitry comprising an impedance algorithm configured to determine an impedance between a plurality of combinations of the electrodes at a plurality of different frequencies during quiet periods when the electrical stimulation at a first frequency is not occurring, and to determine a measured impedance fingerprint from the determined impedances; and a database configured to store a plurality of pre-determined impedance fingerprints and a plurality of associated stimulation programs, wherein the impedance algorithm is further configured to match the measured impedance fingerprint with a pre-determined impedance fingerprint in the database, and to select the stimulation program associated with that pre-determined fingerprint to be provided to the electrodes. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An implantable stimulator device, comprising:
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a plurality of electrodes configured to provide electrical stimulation to a patient; circuitry comprising an impedance algorithm configured to periodically determine an impedance between a plurality of combinations of the electrodes at a plurality of different frequencies during quiet periods when the electrical stimulation at a first frequency is not occurring, and to determine a measured impedance fingerprint from the determined impedances; a log configured to store the measured impedance fingerprints; and a database, wherein the impedance algorithm is further configured to assess the log to identify an impedance fingerprint from the measured impedance fingerprints, and to store that identified impedance fingerprint in a database. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An implantable stimulator device, comprising:
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a plurality of electrodes configured to provide electrical stimulation to a patient; and circuitry comprising an impedance algorithm configured to determine a complex impedance at a plurality of frequencies between at least two of the electrodes during quiet periods when the electrical stimulation at a first frequency is not occurring, wherein the impedance algorithm is further configured to use the determined complex impedances to determine values of electrical components in a tissue model between the two electrodes. - View Dependent Claims (32, 33, 34, 35)
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36. An implantable stimulator device, comprising:
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a plurality of electrodes configured to provide stimulation to a patient; and impedance monitoring circuitry for providing a plurality of measurement signals at different frequencies between at least two of the electrodes and for measuring responses between the at least two electrodes in response to the measurement signals during quiet periods when the electrical stimulation at a first frequency is not occurring, the impedance monitoring circuitry further comprising an impedance algorithm for determining the complex impedance between at least the two electrodes using the measurement signals and the measured responses. - View Dependent Claims (37, 38)
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Specification