Chinese scientists create record-smashing brain implant electrode array thinner than hair

A China-led team of researchers has developed a powerful brain implant electrode array that is as soft as brain tissue, thinner than a strand of hair and more durable than anything before it.

In animal trials, a new flexible brain implant recorded neural activity with unprecedented long-term clarity and remained safely functional inside the body for 18 months.

The breakthrough addressed a major hurdle that had long held back brain-computer interfaces.

Invasive interfaces deliver the clearest and richest neural signals, yet a persistent challenge haunts invasive systems: the inherent mismatch between electrodes and soft brain tissue.

The cortical electrode arrays commonly used today, typically made of platinum or platinum-iridium alloys, offer excellent conductivity but are far stiffer than neural tissue.

In long-term implantation, such “hard-against-soft” friction induces tiny relative displacements, triggering chronic inflammation and eventually forming scar tissue around the electrodes. The result is a steady decline in signal quality year after year.