A pea-sized device that produces weak pulses of electricity is being tested as a treatment for migraine.
The StimRelieve Halo system consists of a tiny implant inserted into the forehead, just under the skin, and a battery which clips to the ear and sends electric pulses to it wirelessly.
More than 140 people are taking part in a U.S. trial, where they will have the implant fitted, but half won’t have the batteries activated. Patients can trigger an electric signal using a button on the battery.
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