METHOD AND APPARATUS FOR DETECTION OF NERVOUS SYSTEM DISORDERS
First Claim
1. A method of detecting a neurological event following delivery of stimulation therapy, the method comprising:
- initializing a post-stimulation detection counter, C, to an initial value, C0;
acquiring a stream of EEG signal data values following delivery of stimulation therapy;
comparing the signal data values to a level cutoff;
decrementing C by a decrement amount if a given data value is below the level cutoff;
incrementing C by an increment amount if a given data value is equal to or exceeds the level cutoff;
comparing C to a post-stimulation detection threshold, PSth; and
detecting a neurological event if C equals or exceeds PSth.
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Abstract
Systems and methods for detecting and/or treating nervous system disorders, such as seizures, are disclosed. Certain embodiments of the invention relate generally to implantable medical devices (IMDs) adapted to detect and treat nervous system disorders in patients with an IMD. Certain embodiments of the invention include detection of seizures based upon comparisons of long-term and short-term representations of physiological signals. Other embodiments include prediction of seizure activity based upon analysis of physiological signal levels. An embodiment of the invention monitors the quality of physiological signals, and may be able to compensate for signals of low signal quality. A further embodiment of the invention includes detection of seizure activity following the delivery of therapy.
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Citations
22 Claims
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1. A method of detecting a neurological event following delivery of stimulation therapy, the method comprising:
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initializing a post-stimulation detection counter, C, to an initial value, C0; acquiring a stream of EEG signal data values following delivery of stimulation therapy; comparing the signal data values to a level cutoff; decrementing C by a decrement amount if a given data value is below the level cutoff; incrementing C by an increment amount if a given data value is equal to or exceeds the level cutoff; comparing C to a post-stimulation detection threshold, PSth; and detecting a neurological event if C equals or exceeds PSth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A computer-readable medium programmed with instructions for performing a method of detecting a neurological event following delivery of stimulation therapy, the medium comprising instructions for causing a programmable processor to:
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initialize a post-stimulation detection counter, C, to an initial value, C0; acquire a stream of EEG signal data values following delivery of stimulation therapy; compare the signal data values to a level cutoff; decrement C by a decrement amount if a given data value is below the level cutoff; increment C by an increment amount if a given data value is equal to or exceeds the level cutoff; compare C to a post-stimulation detection threshold, PSth; and detect a post-stimulation neurological event if C equals or exceeds PSth.
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17. A system for detecting a neurological event following delivery of stimulation therapy, the system comprising:
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an electrode for sensing EEG signals from a brain of a patient; and an implantable medical device (IMD) coupled to the electrode and adapted to receive EEG signals, the IMD comprising a housing, a power source, and a processor, the processor adapted to initialize a post-stimulation detection counter, C, to an initial value, C0; acquire a stream of EEG signal data values following the delivery of stimulation therapy; compare the signal data values to a level cutoff; decrement C by a decrement amount if a given data value is below the level cutoff; increment C by an increment amount if a given data value is equal to or exceeds the level cutoff; compare C to a post-stimulation detection threshold, PSth; and detect a post-stimulation neurological event if C equals or exceeds PSth. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification