Researchers from DTU, the University of Copenhagen, and University College London have developed a groundbreaking brain implant called the microfluidic Axialtrode (mAxialtrode) — a flexible, needle-thin fiber less than half a millimeter wide that can record neural activity, deliver drugs, and apply electrical or light stimulation to multiple brain regions at once. Unlike conventional brain implants made from rigid silicon, the mAxialtrode is crafted from soft, plastic-like optical fibers, making it less likely to irritate brain tissue or trigger inflammation.

In live mouse experiments, the device successfully stimulated neurons using both blue and red light, recorded electrical activity from the cortex and hippocampus simultaneously, and delivered substances to locations nearly 3mm apart — all through a single lightweight implant the mice tolerated without obvious discomfort. The findings were published in Advanced Science.

Key Takeaways:

• Current brain implants typically interact with tissue only at one point; the mAxialtrode enables multi-site recording and stimulation along its entire length
• Its soft, flexible design reduces inflammatory responses compared to rigid silicon-based implants
• Potential therapeutic applications include targeted drug delivery combined with brain stimulation for epilepsy and other neurological disorders

Why it matters: This multi-functional implant could dramatically reduce the number of devices needed for complex brain research, enabling more precise, less invasive experiments — and potentially paving the way for next-generation treatments for epilepsy, memory disorders, and beyond.