METHOD AND APPARATUS FOR DETECTION OF NERVOUS SYSTEM DISORDERS
First Claim
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1. A system for detecting a neurological event, comprising:
- an electrode adapted to sense an EEG signal from a brain of a patient; and
an implantable medical device (IMD) coupled to the electrode and adapted to receive the sensed EEG signal, the IMD comprising a housing, a memory, and a processor, the processor being adapted tosample the sensed EEG signal at a sample rate to form a stream of sampled data values;
calculate an event monitoring parameter based on the stream of sampled data values;
identify an onset of a neurological event when the event monitoring parameter exceeds an onset threshold; and
initiate warm-up of stimulation circuitry when the event monitoring parameter has exceeded the onset threshold for a period of time equal to an onset duration less a warm-up period, the onset duration being a predefined period of time such that a neurological event is detected if the event monitoring parameter exceeds the onset threshold for the onset duration.
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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. Further embodiments of the invention include preparing for the delivery of therapy by warming up therapy delivery components prior to the expected delivery of therapy.
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Citations
17 Claims
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1. A system for detecting a neurological event, comprising:
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an electrode adapted to sense an EEG signal from a brain of a patient; and an implantable medical device (IMD) coupled to the electrode and adapted to receive the sensed EEG signal, the IMD comprising a housing, a memory, and a processor, the processor being adapted to sample the sensed EEG signal at a sample rate to form a stream of sampled data values; calculate an event monitoring parameter based on the stream of sampled data values; identify an onset of a neurological event when the event monitoring parameter exceeds an onset threshold; and initiate warm-up of stimulation circuitry when the event monitoring parameter has exceeded the onset threshold for a period of time equal to an onset duration less a warm-up period, the onset duration being a predefined period of time such that a neurological event is detected if the event monitoring parameter exceeds the onset threshold for the onset duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of treating a neurological event, the method comprising:
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acquiring an EEG signal comprising a stream of sampled data values; calculating an event monitoring parameter based on the sampled data values; comparing the event monitoring parameter to an onset threshold; identifying an onset of a neurological event when the event monitoring parameter exceeds an onset threshold; and initiating warm-up of stimulation circuitry when the event monitoring parameter has exceeded the onset threshold for a period of time equal to an onset duration less a warm-up period, the onset duration being a predefined period of time such that a neurological event is detected if the event monitoring parameter exceeds the onset threshold for the onset duration. - View Dependent Claims (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, the medium comprising instructions for causing a programmable processor to:
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sample an EEG signal at a sample rate to form a stream of sampled data values; calculate an event monitoring parameter based on the sampled data values; identify an onset of a neurological event when the event monitoring parameter exceeds an onset threshold; and initiate warm-up of stimulation circuitry when the event monitoring parameter has exceeded the onset threshold for a period of time equal to an onset duration less a warm-up period, the onset duration being a predefined period of time such that a neurological event is detected if the event monitoring parameter exceeds the onset threshold for the onset duration. - View Dependent Claims (17)
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Specification