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 analysis unit and a feature-based analysis unit.
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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.
41 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 analysis unit and a feature-based analysis unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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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 feature in the electrical signal and calculate at least one window parameter in the electrical signal; 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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10. 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;
wherein the detection subsystem performs at least a portion of a detection task without the use of the central processing unit, thereby allowing the central processing unit to remain in a relatively inactive mode at least part of the time.
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11. A method for detecting a neurological event by analyzing an electrical signal from a patient'"'"'s brain with an implantable device, the method comprising the steps of:
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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 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. - View Dependent Claims (12, 13, 14, 15)
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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 the steps of:
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receiving a first electrical signal and a second electrical signal from a plurality of electrodes;
processing the electrical signals with a detection subsystem to obtain a first detection channel output and a second detection channel output;
combining the first detection channel output and the second detection channel output to obtain an event detector output; and
causing the implantable device to perform an action in accordance with the event detector output.
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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 method comprising the steps of:
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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 feature extraction operation on the digital signal;
performing a window calculation operation on the digital signal;
analyzing a result from the feature extraction operation;
analyzing a result from the window calculation operation; and
performing an action in accordance with the result from the feature extraction operation and the result from the window calculation operation.
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18. 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 the steps of:
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causing the processor to enter a low-power mode;
measuring a 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 feature characteristic and the window characteristic with the processor; and
performing an action in accordance with the feature characteristic and the window characteristic. - View Dependent Claims (19)
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Specification