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 therapy to a tissue of a patient; and
impedance monitoring circuitry configured to apply at least one AC measurement signal different from the electrical stimulation therapy to a plurality of combinations of the electrodes and to determine an impedance between each of the plurality of combinations of the electrodes using the at least one AC measurement signal,wherein the impedance monitoring circuitry is configured to apply the at least one AC measurement signal during quiet periods when electrical stimulation therapy is not occurring at any of the plurality of electrodes.
0 Assignments
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.
84 Citations
19 Claims
-
1. An implantable stimulator device, comprising:
-
a plurality of electrodes configured to provide electrical stimulation therapy to a tissue of a patient; and impedance monitoring circuitry configured to apply at least one AC measurement signal different from the electrical stimulation therapy to a plurality of combinations of the electrodes and to determine an impedance between each of the plurality of combinations of the electrodes using the at least one AC measurement signal, wherein the impedance monitoring circuitry is configured to apply the at least one AC measurement signal during quiet periods when electrical stimulation therapy is not occurring at any of the plurality of electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. An implantable stimulator device, comprising:
-
a plurality of electrodes configured to provide electrical stimulation therapy to a tissue of a patient; and impedance monitoring circuitry configured to generate a plurality of AC measurement signals each of a different frequency and different from the electrical stimulation therapy, apply each of the plurality of AC measurement signals to a plurality of combinations of the electrodes during quiet periods when the electrical stimulation therapy is not occurring, determine an impedance between each of the plurality of combinations of the electrodes using each of the plurality of AC measurement signals, and derive values of electrical components in a tissue model using the impedances determined between each of the plurality of combinations of the electrodes. - View Dependent Claims (17, 18, 19)
-
Specification