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20. Use thermoplastic method to melt poly-L-lactic acid to obtain poly-L-lactic acid melt;

21. Pull out the electrode inner core with the electrode magnetic head from the poly-L-lactic acid melt, so that the poly-L-lactic acid coats the electrode inner core with the electrode magnetic head to obtain a magnetron flexible electrode.

22. Optionally, the polyvinylpyrrolidone solution is prepared by using anhydrous ethanol as a solvent and 15% by mass of polyvinylpyrrolidone as a solute.

23. Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects: a large-scale magnetron flexible brain-computer interface in the embodiment of the present invention includes a printed circuit board, a flexible magnetron electrode, a reference electrode and a Polyvinylpyrrolidone rigid shell; the embodiment of the present invention adopts a flexible magnetron electrode, which can make the controllable magnetic field emit light through the electrode magnetic head.

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