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1. (WO2019048994) NEURAL SPIKE SCANNING FOR HIGH-DENSITY IMPLANTABLE NEURAL RECORDING SYSTEMS
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CLAIMS

1. A neural signal recording device, comprising:

a scan-mode circuit that detects neural spike activity at one or more M groups of electrodes selected from a total of N electrodes that are coupled to a brain; and

a read-mode circuit that records all neural spike signals present at the one or more M groups of electrodes where the neural spike activity is detected by the scan-mode circuit,

wherein less than N electrodes are recorded at any one time by the read-mode circuit.

2. The device of claim 1 , wherein the scan-mode circuit comprises:

a plurality of M signal combining circuits that each combine neural spike signals from a group of C electrodes from the total of N electrodes coupled to the brain, and

a plurality of M neural signal detection circuits that are each coupled to a respective one of the plurality of M signal combining circuits, the plurality of M neural signal detection circuits each detecting a presence of a neural spike signal on the group of C electrodes associated with the respective one of the plurality of M signal combining circuits.

3. The device of claim 2, wherein the read-mode circuit comprises:

a switch matrix coupled to the N electrodes that routes the group of C electrodes associated with the respective one of the plurality of M signal combining circuits, the routing occurring in response to the detecting of the presence of the neural spike signal on the group of C electrodes associated with the respective one of the plurality of M signal combining circuits.

4. The device of claim 3, wherein the read-mode circuit further comprises:

a digital signal processor device that receives and stores neural spike signals that are present on all of the routed group of C electrodes that are associated with the respective one of the plurality of M signal combining circuits that include the detected neural spike signal.

5. The device of claim 2, wherein the plurality of M signal combiner circuits each comprise:

a plurality of high-pass filter circuits that are each coupled to a respective one of the group of C electrodes and generate a filtered output;

a power combiner circuit; and

a switch control unit that controls the transmission of the filtered output from each of the plurality of high-pass filter circuits to the power combiner circuit,

wherein the power combiner aggregates filtered neural spike signals received from the group of C electrodes.

6. A neural signal recording device, comprising:

a first signal combiner circuit having a first group of inputs and a first output, the first group of inputs coupled to a first group of Ci electrodes of N electrodes coupled to a brain, and the first output combining one or more first neural spike signals received from the first group of Ci electrodes;

a second signal combiner circuit having a second group of inputs and a second output, the second group of inputs coupled to a second group of C2 electrodes of the N electrodes, and the second output combining one or more second neural spike signals received from the second group of C2 electrodes;

a plurality of neural signal detection circuits respectively coupled to the first and the second outputs for detecting one or more neural spike signals from either the Ci electrodes or the C2 electrodes; and

a switch matrix coupled to the N electrodes that either routes only all of the first group of Ci electrodes for signal recording responsive to the detecting of the one or more first neural spike signals from the Ci electrodes or only routes all of the second group of C2 electrodes for signal recording responsive to the detecting of the one or more second neural spike signals from the C2 electrodes, wherein Ci < N and C2 < N.

7. The device of claim 6, wherein the first signal combiner circuit comprises a first switch device that is in a closed-circuit position when the first neural signal detection circuit is in a scan mode for detecting the one or more first neural spike signals from the first group of Ci electrodes, and wherein the first switch is in an open-circuit position when the switch matrix is routing the first group of Ci electrodes to the first neural signal detection circuit in a read mode for signal recording.

8. The device of claim 6, wherein the second signal combiner circuit comprises a second switch device that is in a closed-circuit position when the second neural signal detection circuit is in a scan mode for detecting the one or more second neural spike signals from the second group of C2 electrodes, and wherein the second switch is in an open-circuit position when the switch matrix is routing the second group of C2 electrodes to the second neural signal detection circuit in a read mode for signal recording.

9. The device of claim 6, wherein the first signal combiner circuit comprises:

a plurality of first high-pass filter circuits that are each coupled to a respective one of the first group of Ci electrodes and generate a filtered output;

a first power combiner circuit; and

a first switch control unit that controls the transmission of the filtered output from each of the first plurality of high-pass filter circuits to the first power combiner circuit.

10. The device of claim 6, wherein the second signal combiner circuit comprises:

a plurality of second high-pass filter circuits that are each coupled to a respective one of the second group of 0,2 electrodes and generate a filtered output;

a second power combiner circuit; and

a second switch control unit that controls the transmission of the filtered output from each of the plurality of second high-pass filter circuits to the second power combiner circuit.

11. The device of claim 6, wherein the plurality of neural signal detection circuits comprises a first neural signal detection circuit comprising:

a first band-pass filter for detecting the one or more first neural spike signals by applying filtering;

a first amplifier circuit coupled to the first band-pass filter for amplifying the detected one or more first neural spike signals received from the first band-pass filter; and

a first analog-to-digital (A/D) convertor circuit coupled to the first amplifier circuit for digitizing the amplified one or more first neural spike signals received from the first amplifier circuit.

12. The device of claim 6, wherein the plurality of neural signal detection circuits comprises a second neural signal detection circuit comprising:

a second band-pass filter for detecting the detected one or more second neural spike signals by applying filtering;

a second amplifier circuit coupled to the second band-pass filter for amplifying the detected one or more second neural spike signals received from the second band-pass filter; and

a second analog-to-digital (A/D) convertor circuit coupled to the second amplifier circuit for digitizing the amplified one or more second neural spike signals received from the second amplifier circuit.

13. A method of recording neural spike signals from a brain, the method comprising:

dividing N electrodes coupled to the brain into M groups, the M groups each having a plurality of electrodes;

combining signals received from the plurality of electrodes corresponding to each one of the M groups of electrodes to generate M signal outputs;

scanning all of the M signal outputs for the detection of neural spike signals; and

responsive to the detection of the neural spike signals within any one or more of the M signal outputs, recording neural spike activity on all of the plurality of electrodes corresponding to the any one or more of the M groups of electrodes where the neural spike signals are detected,

wherein less than N electrodes are recorded at any one time.

14. The method of claim 13, wherein during the recording of the neural spike activity on all the electrodes within any one or more of the M groups of electrodes, the scanning for the detection of the neural spike signals within the any one or more of the M groups of electrodes is disabled.

15. The method of claim 13, wherein responsive to the detection of the presence of the neural spike signals, at N

least— electrodes and at most M electrodes are recorded at any one time.

M

16. The method of claim 13, wherein the detection of the neural spike signals comprise:

band-pass filtering signals received on each of the M signal outputs;

amplifying each of the band-pass filtered signals; and

converting each of the amplified signals to a digital format.

17. The method of claim 13, wherein the recording comprises:

applying the N electrodes to a switch matrix having switch inputs and switch outputs;

routing, from the switch inputs to the switch outputs, all the electrodes within any one or more of the M groups of electrodes corresponding to the any one or more of the M signal outputs on which the neural spike signals were detected; and

digitizing any neural spike signals located at the switch outputs based on the routing of all the electrodes within any one or more of the M groups of electrodes corresponding to the any one or more of the M signal outputs on which the neural spike signals were detected.

18. The method of claim 17, wherein the any digitized neural spike signals are radio transmitted from a region of a skull encapsulating the brain.

19. The method of claim 13, further comprising:

dividing the M groups of one or more electrodes into Ms groups of one or more electrodes and M R groups of one or more electrodes;

combining the one or more electrodes from each one of the Ms groups of electrodes to generate Ms signal outputs;

scanning all of the Ms signal outputs for the detection of neural spike signals; and

responsive to the detection of the presence of the neural spike signals within any one or more of the Ms signal outputs, recording neural spike activity on all electrodes within any one or more of the Ms groups of electrodes corresponding to the any one or more of the Ms signal outputs; and

recording neural spike activity on all electrodes within any one or more of the M R groups of electrodes.

20. The method of claim 19, wherein the scanning of all of the Ms signal outputs occur simultaneously with the recording of the neural spike activity on all the electrodes within any one or more of the M R groups of electrodes.

21. A computer-implemented method of recording neural spike signals from a brain, the method comprising: generating a scan control signal for enabling the receiving of a plurality of M output signals, wherein each of the plurality of M output signals are based on a combining of a plurality of input signals respectively received from a plurality of N electrodes coupled to the brain;

receiving digitized versions of the received plurality of M output signals for detecting neural spike signals from one or more of the plurality of M output signals; and

generating a read control signal for enabling a signal recording from all of the plurality of electrodes corresponding to the one or more of the plurality M output signals having the detected neural spike signals, wherein during the signal recording, the receiving of the plurality of output signals is disabled by the scan control signal, and wherein M<N.

22. The computer-implemented method of claim 21 , wherein the signal recording is enabled by controlling a routing of all of the plurality of electrodes corresponding to the one or more of the plurality M output signals having the detected neural spike signals to a digital signal processor via a switch matrix.

23. The computer-implemented method of claim 21 , further comprising:

generating a scan control signal for enabling receiving J of the M output signals, wherein each of the J of the M output signals are based on a combining of a plurality of input signals received from a first group of the plurality of N electrodes;

receiving digitized versions of the plurality of J output signals for detecting neural spike signals from one or more of the plurality of J output signals;

generating a first read control signal for enabling a signal recording from the plurality of input signals received from the first group of the plurality of N electrodes that respectively correspond to the one or more of the plurality J output signals having the detected neural spike signals; and

generating a second read control signal for enabling a signal recording from a plurality of input signals received from a second group of the plurality of N electrodes, wherein the second group of the plurality of N electrodes are respectively recorded via M-J output signals.

24. A computer program product for recording neural spike signals from a brain, the computer program product comprising:

one or more non-transitory computer-readable storage devices and program instructions stored on at least one of the one or more non-transitory storage devices, the program instructions executable by a processor, the program instructions comprising:

instructions to generate a scan control signal for enabling the receiving of a plurality of M output signals, wherein each of the plurality of M output signals are based on a combining of a plurality of input signals respectively received from a plurality of N electrodes coupled to the brain;

instructions to receive digitized versions of the received plurality of M output signals for detecting neural spike signals from one or more of the plurality of M output signals; and

instructions to generate a read control signal for enabling a signal recording from all of the plurality of electrodes corresponding to the one or more of the plurality M output signals having the detected neural spike signals, wherein during the signal recording, the receiving of the plurality of output signals is disabled by the scan control signal, and wherein M<N.

25. The computer program product of claim 24, further comprising:

instructions to generate a scan control signal for enabling receiving J of the M output signals, wherein each of the J of the M output signals are based on a combining of a plurality of input signals received from a first group of the plurality of N electrodes;

instructions to receive digitized versions of the plurality of J output signals for detecting neural spike signals from one or more of the plurality of J output signals;

instructions to generate a first read control signal for enabling a signal recording from the plurality of input signals received from the first group of the plurality of N electrodes that respectively corresponds to the one or more of the plurality J output signals having the detected neural spike signals; and

instructions to generate a second read control signal for enabling a signal recording from a plurality of input signals received from a second group of the plurality of N electrodes, wherein the second group of the plurality of N electrodes are respectively recorded via M-J output signals.