Seizure sensing and detection using an implantable device
First Claim
1. An implantable device for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain, the device comprising:
- an implantable control module;
a central processing unit located within the control module; and
a detection subsystem located within the control module and comprising a waveform analyzer having a window-based analyzer configured to identify waveform features using sample-to-sample amplitude variations of the electrical signal during a window and a feature-based analyzer configured to identify half wave features of the electrical signal.
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Accused Products
Abstract
A system and method for detecting and predicting neurological events with an implantable device uses a relatively low-power central processing unit in connection with signal processing circuitry to identify features (including half waves) and calculate window-based characteristics (including line lengths and areas under the curve of the waveform) in an electrographic signal received from a patient'"'"'s brain. The features and window-based characteristics are combinable in various ways according to the invention to detect and predict neurological events in real time, enabling responsive action by the implantable device.
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Citations
19 Claims
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1. An implantable device for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain, the device comprising:
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an implantable control module; a central processing unit located within the control module; and a detection subsystem located within the control module and comprising a waveform analyzer having a window-based analyzer configured to identify waveform features using sample-to-sample amplitude variations of the electrical signal during a window and a feature-based analyzer configured to identify half wave features of the electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11)
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9. An implantable device for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain, the device comprising:
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an implantable control module; a detection subsystem located within the control module and adapted to identify at least one half wave feature in the electrical signal and calculate at least one window parameter in the electrical signal using sample-to-sample amplitude variations of the electrical signal during a window; and a central processing unit located within the control module and adapted to analyze the at least one feature and the at least one window parameter, and to initiate an action in accordance therewith.
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12. A method for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain with an implantable device, the method comprising:
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receiving the electrical signal with an electrode pair; processing the electrical signal with a detection subsystem, wherein the detection subsystem is adapted to identify at least one half wave feature in the electrical signal and calculate at least one window parameter in the electrical signal using sample-to-sample amplitude variations of the electrical signal during a window; and causing the implantable device to perform an action in accordance with an indication from the detection subsystem. - View Dependent Claims (13, 14)
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15. A method for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain with an implantable device, the method comprising:
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receiving the electrical signal with an electrode pair; processing the electrical signal with a detection subsystem, wherein the detection subsystem is adapted to identify at least one half wave feature in the electrical signal and calculate at least one window parameter in the electrical signal; and causing the implantable device to perform an action in accordance with an indication from the detection subsystem, wherein the processing the electrical signal comprises; sampling the electrical signal to create a sampled digital signal; identifying a feature in the sampled digital signal with a wave morphology analyzer; and calculating a window parameter in the sampled digital signal with a window analyzer, wherein calculating a window parameter comprises computing a line length function.
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16. A method for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain with an implantable device, the method comprising:
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receiving the electrical signal with an electrode pair; processing the electrical signal; converting the electrical signal into a digital signal; performing a half wave feature extraction operation on the digital signal; performing a window calculation operation on the digital signal using sample-to-sample amplitude variations of the digital signal during a window; analyzing a result from the half wave feature extraction operation; analyzing a result from the window calculation operation; and performing an action in accordance with the result from the half wave feature extraction operation and the result from the window calculation operation.
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17. A method for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain with an implantable device, the device having a processor and a detection subsystem, the method comprising:
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causing the processor to enter a low-power mode; measuring a half wave feature characteristic of the electrical signal with the detection subsystem; measuring a window characteristic of the electrical signal with the detection subsystem; causing the processor to exit the low-power mode; analyzing the half wave feature characteristic and the window characteristic with the processor; and performing an action in accordance with the half wave feature characteristic and the window characteristic. - View Dependent Claims (18)
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19. An implantable device for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain, the device comprising:
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an implantable control module; a central processing unit located within the control module; and a detection subsystem located within the control module and comprising a waveform analyzer having a window-based analyzer and a feature-based analyzer configured to identify half wave features of the electrical signal, wherein the detection subsystem is configured to receive the electrical signal from an electrode pair, identify at least one feature in the electrical signal, calculate at least one window parameter in the electrical signal, provide an indication to the implantable device to perform an action in accordance with an indication from the detection subsystem, and sample the electrical signal to create a sampled digital signal, wherein the window analyzer is configured to calculate a window parameter in the sampled digital signal, wherein the window-based analyzer is adapted to analyze a line length function and an area function in the electrical signal, wherein the feature-based analyzer is configured to identify a half wave feature in the sampled digital signal includes the feature-based analyzer is configured to locate a half wave in the sampled digital signal, determine whether an amplitude of the half wave exceeds an amplitude threshold and whether a duration of the half wave exceeds a duration threshold, and if both thresholds are met, label the half wave as a qualified half wave, and if the half wave is a qualified half wave, store a record representative of the qualified half wave, wherein the feature-based analyzer is adapted to analyze the half waves in the electrical signal.
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Specification