Electrode to nerve distance estimation
First Claim
1. An implantable device for estimating a nerve-to-electrode distance, the device comprising:
- at least one stimulus electrode and at least one sense electrode;
measurement circuitry for obtaining a neural measurement from the at least one sense electrode; and
a processor configured to;
apply from the at least one stimulus electrode to a nerve at least one stimulus having defined stimulus parameters;
obtain from the measurement circuitry a plurality of neural measurements of at least one compound action potential evoked by the at least one stimulus;
process the plurality of neural measurements in order to estimate an originating state of stimulation, the originating state of stimulation exhibiting at least one observable characteristic defined by a single fibre size; and
apply a single fibre model to the estimated originating state of stimulation and the stimulus parameters, in order to produce a measure of the nerve-to-electrode distance.
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Accused Products
Abstract
Estimating a nerve-to-electrode distance involves applying a stimulus from a stimulus electrode to a nerve. Neural measurements of at least one evoked compound action potential are obtained, and processed in order to estimate an originating state of stimulation exhibiting at least one characteristic defined by a single fibre size. A single fibre model is then applied to produce a measure of the nerve-to-electrode distance. Also provided for is estimation of a distribution of recruited fibres. Measurements of a compound action potential are obtained from sense electrodes spaced apart along a neural pathway. A conduction velocity of the compound action potential is determined from the latency between the measurements. From the conduction velocity a dominant recruited fibre diameter is determined. A rate of dispersion of the compound action potential between the sense electrodes is determined. From the rate of dispersion a distribution of diameters of the recruited fibre population is determined.
298 Citations
21 Claims
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1. An implantable device for estimating a nerve-to-electrode distance, the device comprising:
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at least one stimulus electrode and at least one sense electrode; measurement circuitry for obtaining a neural measurement from the at least one sense electrode; and a processor configured to; apply from the at least one stimulus electrode to a nerve at least one stimulus having defined stimulus parameters; obtain from the measurement circuitry a plurality of neural measurements of at least one compound action potential evoked by the at least one stimulus; process the plurality of neural measurements in order to estimate an originating state of stimulation, the originating state of stimulation exhibiting at least one observable characteristic defined by a single fibre size; and apply a single fibre model to the estimated originating state of stimulation and the stimulus parameters, in order to produce a measure of the nerve-to-electrode distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification