Brain signal telemetry and seizure prediction
First Claim
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1. An apparatus comprising:
- an ambulatory intrinsic brain signal processor circuit, configured to be coupled to a plurality of electrodes, the signal processor circuit comprising;
a digital multiplexer circuit, configured to be coupled to the electrodes, and configured to multiplex brain signal data from different electrodes together into a multiplexed data stream;
an ambulatory transceiver circuit, configured to wirelessly communicate information to a remote transceiver, and configured to wirelessly receive user-programming information from the remote transceiver; and
a controller circuit, configured to;
select N user-specified electrodes that contribute data to the multiplexed data stream;
select a data resolution of the electrodes that contribute data to the multiplexed data stream; and
select, for each particular electrode that contributes data to the multiplexed data stream, one, from between user-selectable choices including all three, of the following settings;
(1) neural action potential data, from which neural field potential data has been reduced or removed;
(2) neural field potential data, from which neural action potential data has been reduced or removed; and
(3) both neural action potential and neural field potential data, and wherein the user-selected one of the three settings is used to automatically select an appropriate gain or frequency setting of a sense amplifier corresponding to the particular electrode; and
a Normal template, providing an indication of a set of correlations of brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one neurologically non-abnormal time period of the subject;
a Non-Normal template, providing an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one pre-neurologically-abnormal time period or neurologically abnormal time period of the subject;
a monitoring circuit, configured to form, during a sampling time period, an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, using the at least two different locations of a brain of the subject; and
an upcoming neurologically-abnormal-state prediction circuit, configured to predict an upcoming neurologically abnormal state at least in part by comparing the indication of the set of correlations obtained during the sampling time period to each of the Normal and Non-Normal templates.
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Abstract
An ambulatory intrinsic brain signal processor circuit is coupled to a plurality of electrodes. The signal processor circuit can include a digital multiplexer circuit coupled to the electrodes to multiplex brain signal data from different electrodes together into a multiplexed data stream. An ambulatory transceiver circuit wirelessly communicates information to and from a remote transceiver. A controller circuit permits a user to control which of the electrodes contribute data, a data resolution, and whether the data includes one or both of neural action or local field potential data. Seizure prediction components and methods are also described.
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Citations
33 Claims
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1. An apparatus comprising:
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an ambulatory intrinsic brain signal processor circuit, configured to be coupled to a plurality of electrodes, the signal processor circuit comprising; a digital multiplexer circuit, configured to be coupled to the electrodes, and configured to multiplex brain signal data from different electrodes together into a multiplexed data stream; an ambulatory transceiver circuit, configured to wirelessly communicate information to a remote transceiver, and configured to wirelessly receive user-programming information from the remote transceiver; and a controller circuit, configured to; select N user-specified electrodes that contribute data to the multiplexed data stream; select a data resolution of the electrodes that contribute data to the multiplexed data stream; and select, for each particular electrode that contributes data to the multiplexed data stream, one, from between user-selectable choices including all three, of the following settings;
(1) neural action potential data, from which neural field potential data has been reduced or removed;
(2) neural field potential data, from which neural action potential data has been reduced or removed; and
(3) both neural action potential and neural field potential data, and wherein the user-selected one of the three settings is used to automatically select an appropriate gain or frequency setting of a sense amplifier corresponding to the particular electrode; anda Normal template, providing an indication of a set of correlations of brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one neurologically non-abnormal time period of the subject; a Non-Normal template, providing an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one pre-neurologically-abnormal time period or neurologically abnormal time period of the subject; a monitoring circuit, configured to form, during a sampling time period, an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, using the at least two different locations of a brain of the subject; and an upcoming neurologically-abnormal-state prediction circuit, configured to predict an upcoming neurologically abnormal state at least in part by comparing the indication of the set of correlations obtained during the sampling time period to each of the Normal and Non-Normal templates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus comprising:
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a plurality of electrode assemblies, each electrode assembly including; at least one electrode, configured to be coupled to a brain of a subject; a brain signal sense amplifier circuit, coupled to the electrode, and configured to sense an intrinsic brain signal and to output a resulting sensed brain signal that is indicative of the intrinsic brain signal; a filter circuit, coupled to the sense amplifier circuit, the filter circuit including a user-programmable frequency filtering characteristic configured to select one, from between user-selectable choices including all three, of the following settings;
(1) passing neural action potential frequencies in a range from about 300 Hz to about 6 kHz;
(2) passing neural field potential frequencies in a range from about 0.5 Hz to about 500 Hz; and
(3) passing both neural action potential and neural field potential frequencies;an analog-to-digital converter (“
ADC”
) circuit, coupled to the filter circuit, the ADC circuit configured to digitize brain signal information passed by the filter circuit, the digitizing occurring in close proximity to the electrode;an ambulatory memory device, configured to store brain signal information; an ambulatory signal processor circuit, coupled to the electrode assemblies, the signal processor circuit including; a digital multiplexer circuit, coupled to the electrode assemblies, and configured to multiplex data from different electrode assemblies together into a multiplexed data stream; a transceiver circuit, configured to communicate information to a remote transceiver; and a controller circuit, configured to control the digital multiplexer to select; which N user-specified electrodes contribute data to the multiplexed data stream; a data resolution of each electrode contributing data to the multiplexed data stream; whether a particular electrode'"'"'s data contribution to the multiplexed data stream is at least one of;
provided to the transmitter for communication to the remote receiver or provided to the ambulatory memory device for storage; andwhether data contributed by a particular electrode includes a user-selected one of user-selectable choices including all three of;
(1) neural action potential data, from which neural field potential data has been reduced or removed;
(2) neural field potential data, from which neural action potential data has been reduced or removed; and
(3) both neural action potential and neural field potential data, wherein the user-selected one of the three choices is used to automatically select an appropriate gain or frequency setting of a sense amplifier corresponding to the particular electrode; anda Normal template, providing an indication of a set of correlations of brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one neurologically non-abnormal time period of the subject; a Non-Normal template, providing an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one pre-neurologically-abnormal time period or neurologically abnormal time period of the subject; a monitoring circuit, configured to form, during a sampling time period, an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, using the at least two different locations of a brain of the subject; and an upcoming neurologically-abnormal-state prediction circuit, configured to predict an upcoming neurologically abnormal state at least in part by comparing the indication of the set of correlations obtained during the sampling time period to each of the Normal and Non-Normal templates. - View Dependent Claims (19)
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20. An apparatus comprising:
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ambulatory means for acquiring brain signals at different locations of a subject'"'"'s brain; and ambulatory means for receiving information from user input to select;
which N user-specified electrodes at the respective different locations contribute data to a monitored data stream;
a data resolution of the locations that contribute data to the monitored data stream; and
whether data contributed by a particular location includes a user-selected one, from between user-selectable choices including all three of the following;
(1) neural action potential data, having frequencies a range from about 300 Hz to about 6 kHz, from which neural field potential data has been reduced or removed;
(2) neural field potential data, having frequencies in a range from about 0.5 Hz to about 500 Hz, from which neural action potential data has been reduced or removed; and
(3) both neural action potential and neural field potential data, and wherein the user-selected one of the three choices is used to automatically select an appropriate gain or frequency setting of a sense amplifier corresponding to the particular electrode; anda Normal template, providing an indication of a set of correlations of brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one neurologically non-abnormal time period of the subject; a Non-Normal template, providing an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, during at least one pre-neurologically-abnormal time period or neurologically abnormal time period of the subject; a monitoring circuit, configured to form, during a sampling time period, an indication of a set of correlations of the brain potentials between all N user-specified electrodes contributing to the multiplexed data stream, using the at least two different locations of a brain of the subject; and an upcoming neurologically-abnormal-state prediction circuit, configured to predict an upcoming neurologically abnormal state at least in part by comparing the indication of the set of correlations obtained during the sampling time period to each of the Normal and Non-Normal templates. - View Dependent Claims (21)
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22. A method comprising:
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acquiring brain signals at different locations of an ambulatory subject'"'"'s brain; receiving, at the ambulatory subject, information from user input to control;
which N user-selected electrodes at the different locations contribute data to a monitored data stream;
a data resolution of the locations that contribute data to the monitored data stream; and
whether data contributed by a particular location includes a user-selected one, from between user-selectable choices including all three of;
(1) neural action potential data having frequencies in a range from about 300 Hz to about 6 kHz, from which neural field potential data has been reduced or removed;
(2) neural field potential data having frequencies in a range from about 0.5 Hz to about 500 Hz, from which neural action potential data has been reduced or removed; and
(3) both neural action potential and neural field potential data;using the user-selected one of the three settings to automatically select an appropriate gain or frequency setting of a sense amplifier corresponding to the particular electrode; receiving a Normal template providing an indication of a set of correlations between all N user-specified locations that contribute data to the monitored data stream, during at least one neurologically non-abnormal time period of a subject; receiving a Non-Normal template providing an indication of a set of correlations between all N user-specified locations that contribute data to the monitored data stream, during at least one pre-neurologically-abnormal time period or neurologically abnormal time period of the subject; monitoring intrinsic brain potentials using at least two different locations of a brain of the subject and forming an indication of a set of correlations of the brain potentials between all N user-specified locations that contribute data to the monitored data stream, including at the at least two different locations during a sampling time period; and predicting an upcoming seizure at least in part by comparing the indication of the set of correlations of the brain potentials obtained during the sampling time period to each of the Normal and Non-Normal templates. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification