Method and apparatus for estimating neural recruitment
First Claim
1. A method of determining neural recruitment arising from a selected neural stimulus, the method comprising:
- applying the selected neural stimulus from at least one stimulus electrode;
at a time t after conclusion of the selected neural stimulus, applying a probe stimulus having a short pulse width;
measuring, with measurement circuitry, a remnant neural response evoked by the probe stimulus;
changing t;
repeating the applying the selected neural stimulus, the applying the probe stimulus, the measuring and the changing, to determine variations in the remnant neural response measure with varying t, andfrom at least one measured remnant neural response, determining neural recruitment caused by the selected neural stimulus using a control unit.
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Abstract
An implantable device for estimating neural recruitment arising from a stimulus, has a plurality of electrodes. A stimulus source provides stimuli to be delivered from the electrodes to neural tissue. Measurement circuitry obtains a measurement of a neural signal sensed at the electrodes. A control unit is configured to control application of a selected stimulus to neural tissue using the stimulus electrodes; and after the selected neural stimulus, apply a probe stimulus having a short pulse Width. A remnant neural response evoked by the probe stimulus is measured; and the control unit estimates from the remnant neural response a neural recruitment caused by the selected neural stimulus.
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Citations
14 Claims
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1. A method of determining neural recruitment arising from a selected neural stimulus, the method comprising:
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applying the selected neural stimulus from at least one stimulus electrode; at a time t after conclusion of the selected neural stimulus, applying a probe stimulus having a short pulse width; measuring, with measurement circuitry, a remnant neural response evoked by the probe stimulus; changing t; repeating the applying the selected neural stimulus, the applying the probe stimulus, the measuring and the changing, to determine variations in the remnant neural response measure with varying t, and from at least one measured remnant neural response, determining neural recruitment caused by the selected neural stimulus using a control unit. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. An implantable device for determining neural recruitment arising from a selected neural stimulus, the device comprising:
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a plurality of electrodes including one or more nominal stimulus electrodes and one or more nominal sense electrodes; a stimulus source for providing stimuli to be delivered from the one or more stimulus electrodes to neural tissue; measurement circuitry for obtaining a measurement of a neural signal sensed at the one or more sense electrodes; and a control unit configured to control application of a selected stimulus to neural tissue using the stimulus electrodes;
the control unit further configured to, at a time t after conclusion of the selected neural stimulus, apply a probe stimulus having a short pulse width;
the control unit further configured to measure a remnant neural response evoked by the probe stimulus;
the control unit further configured to change t;
the control unit further configured to repeat the applying the selected neural stimulus, the applying the probe stimulus, the measuring and the changing, to determine variations in the remnant neural response measure with varying t; and
the control unit further configured to determine from at least one measured remnant neural response a neural recruitment caused by the selected neural stimulus. - View Dependent Claims (8, 9, 10, 11, 12, 14)
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Specification