NeuroWorm: China's Brain Implant Electrode Is Thinner Than Hair and Roams the Brain Magnetically

NeuroWorm was demonstrated to "roam" inside rabbit skulls, actively changing monitoring targets as needed, and provided stable bioelectrical recordings from both brain and muscle tissue . In muscle tissue, it provided stable bioelectrical monitoring in rats for more than 43 weeks, and even after 54 weeks of implantation, fibroblast encapsulation around the fibre remained negligible .

The Technology Behind the Breakthrough

The electrode is fabricated by rolling a 2D bioelectronic device into a 1D microfibre, creating a self-encapsulated structure with exposed electrode sites as tissue interfaces . The process allows integration of up to 60 discrete channels, and the fibre's softness (using a 400-nm-thick styrene ethylene butylene styrene substrate with patterned gold wires) ensures it matches the mechanical properties of brain tissue — eliminating the source of chronic inflammation .

How It Steers: Magnetic Guidance

The key innovation enabling mobility is the incorporation of a tiny magnetic head at the tip of the electrode. External magnetic fields can then be used to steer the fibre through brain tissue, allowing researchers to target different neural populations without additional surgery . This dynamic capability could enable long-term studies of how neural activity changes over time across different brain regions.

Publication and Research Team

The study was published in Nature on September 17, 2025, by researchers from the Shenzhen Institutes of Advanced Technology (SIAT) under the Chinese Academy of Sciences, the Shenzhen University of Advanced Technology, and Donghua University . The lead researchers include Prof. Liu Zhiyuan, Prof. Xu Tiantian, Assoc. Prof. Han Fei, and Prof. Yan Wei .

Why This Matters for Brain-Computer Interfaces

NeuroWorm addresses two of the biggest challenges holding back brain-computer interfaces: the short functional lifespan of implanted electrodes and the inability to record from multiple brain targets without inserting multiple rigid probes . By enabling a single implant to dynamically move and record for over a year, it opens new possibilities for studying long-term neural dynamics and for future BCI applications in treating neurological conditions.