On a weekday afternoon, Cai Yuqingyan waits outside a kindergarten gate. For most parents, the moment a child runs into their arms is entirely unremarkable. For Cai, it is a hard-won triumph.

A world champion in para swimming and canoeing, Cai lost her leg in a traffic accident before her third birthday. For decades, navigating life on crutches meant that even a simple, spontaneous embrace required careful physical calculation.

That changed after she was fitted with an intelligent bionic leg developed by Chinese neurotech firm BrainCo.

"Now when my daughter runs toward me, I can stand steady and catch her," Cai said. "It used to be something I had to consciously prepare for. Now, it's just everyday life."

Her experience reflects a broader shift as brain-computer interface (BCI) technologies begin moving beyond research laboratories into commercial medical devices aimed at rehabilitation and assistive care.

Industry researchers say the market remains small but is expanding rapidly. Global BCI revenue could grow from about $562 million in 2024 to more than $2.2 billion by 2032, market research firm Kings Research estimates, with healthcare and rehabilitation applications accounting for the largest share of current demand.

For BrainCo, the move from academic theory to commercial hardware was sparked by a chance encounter.

During the company's early days, its researchers met a student at the Massachusetts Institute of Technology who had lost his right hand in a laboratory accident. The engineering team began to wonder if their ongoing research into neural signals could be applied to control a prosthetic limb. That single question birthed the company's first neural-controlled prototype.