The electrodes stay in permanently, powered by an implanted pacemaker.

电极永久性植入脑部，由植入式起搏器供电。

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"Our next step is to fabricate a complete self-powered pacemaker and examine it with animal tests, " wrote Dr. Karami in an email.

WSJ: Harnessing Energy From the Body to Power Devices

And these children could not go home with a pacemaker, but Mr. Earl Bakken, who was the president of a small company called Medtronic in Minneapolis, then built a portable, battery powered pacemaker that these children could use.

CNN: Pacemaker pioneer now lives with device