Originally published on May 22, 2025. This article was updated and republished on April 15, 2026, with added audio.
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For the first time, a paralyzed man has walked again using a new, minimally invasive “brain-spine interface” developed in Shanghai. Here’s what that really means.
Imagine waking up one day and realizing that your legs simply won’t move. The connection between your brain and your spine has been broken by an accident. For two years, you can think about walking, but nothing happens.
Now imagine that, after a four-hour surgery, you can stand again. And just 24 hours later, you take your first steps.
This is not science fiction. In March 2025, a team of researchers at Fudan University in Shanghai announced that a patient named Lin, who had been completely paralyzed from a fall, had regained the ability to walk. The tool that made it possible is called an AI-powered Brain-Spine Interface (BSI) .
This article breaks down what this technology is, how it works, why it matters for the 20 million people worldwide living with spinal cord injuries, and what it means for the future of treating paralysis.
Originally published on May 22, 2025. This article was updated and republished on April 15, 2026, with added audio.
What is a Brain-Spine Interface (BSI)?
To understand BSI, let’s first think of the human nervous system as a high-speed internet connection.
- Your brain is the computer that sends the command: “Move legs.”
- Your spinal cord is the cable that carries that command down to your leg muscles.
- Your legs are the device that executes the command.
In a person with a severe spinal cord injury, that cable is severed. The brain keeps sending the “walk” signal, but it never reaches the legs. The patient remains paralyzed.
A Brain-Spine Interface creates a new, artificial cable around the injury. It works in three basic steps:
- Listen to the “move” command from the brain.
- Translate that brain signal into a digital instruction that a computer can understand.
- Send that instruction to a device that stimulates the spinal cord below the injury, triggering leg muscle movement.
Previous BSI systems have existed, but they had major limitations. Many require open-brain surgery to implant large electrodes, which is risky, invasive, and not suitable for many patients. Others were slow or gave jerky, robotic movements.
What Fudan University’s team, led by Professor JIA Fumin, has done is different. They have created the world’s first “triple-integrated” BSI that is minimally invasive and powered by artificial intelligence (AI).
The Breakthrough: A “Minimally Invasive” Approach
The key word here is minimally invasive.
Instead of opening the skull, Professor Jia’s team at Fudan’s Institute of Science and Technology for Brain-Inspired Intelligence (ISTBI) used a technique similar to placing a stent — a small, mesh tube used to prop open arteries.
- In the brain: They implanted a tiny, flexible electrode into a blood vessel on the brain’s surface. This electrode sits inside the vessel but can still read the electrical signals from the motor cortex — the part of the brain that controls movement. No hole is drilled in the skull.
- In the spinal cord: They placed a separate stimulation device on the spine, below the level of the injury.
Between these two devices sits an AI system. This is the real secret sauce. The AI learns the patient’s unique brain patterns. When patient Lin thinks about walking, the AI recognizes that specific brain signal almost instantly. It then wirelessly sends a command to the spinal stimulator, which activates the right muscles in the correct sequence to produce a natural walking motion.
The Patient’s Journey: From Wheelchair to Steps
Let’s look at the specific case reported by Fudan University.
The patient: A man surnamed Lin.
The cause of injury: A fall from a 4-meter-high staircase two years prior. This caused a severe spinal injury and a brain hemorrhage.
The result: Complete paralysis from the waist down. The neural connection between his brain and the walking center of his spinal cord was completely severed.
On March 3, 2025, Lin underwent the minimally invasive BSI surgery at HuaShan Hospital, part of Fudan University. The procedure lasted only four hours.
The result was astonishing. Within 24 hours of the surgery, Lin was able to move his legs. He became the world’s first person with total paraplegia (paralysis from the waist down) to restore walking ability using this minimally invasive technology.
This was not a one-off miracle. Professor Jia’s team had already completed the world’s first three “proof-of-concept” surgeries between January and February 2024 at ZhongShan Hospital, another Fudan affiliate. Those three patients also regained leg movement. The surgery on Lin was the fourth successful case, demonstrating that the method can be reproduced in different hospitals and on different patients.
Why “Triple-Integrated” Matters
You might wonder: Haven’t other labs helped paralyzed people walk before?
Yes. But previous systems usually worked in one direction only — either reading from the brain or stimulating the spine. Fudan’s “triple-integrated” BSI is novel because it combines three functions into one smooth loop:
- High-resolution brain reading: The stent-like electrode captures detailed, stable signals from the brain without needing open surgery.
- AI-powered decoding: The artificial intelligence continuously learns and adapts to the patient’s intentions. If the patient thinks “walk faster,” the AI adjusts the stimulation pattern in real time.
- Precise spinal stimulation: The device on the spine does not just blast the nerves with electricity. It delivers targeted pulses that mimic the body’s natural signals, allowing for smoother, more controlled movements.
Professor Jia called the results “beyond expectations.” The fact that the patient could move his legs within a day suggests that the AI had already learned to translate his brain signals correctly during the surgery itself.
🔗 Source: Fudan University – March 2025 News
The Bigger Picture: Hope for 20 Million People
According to the Fudan report, there are an estimated 20 million people worldwide living with spinal cord injuries. Many of them are young, injured in accidents, sports, or falls. Until now, their options have been limited: wheelchairs, physical therapy, and in some cases, experimental devices that require risky brain surgery.
This new BSI offers a different path.
- Low risk: Because it is minimally invasive (using blood vessels as natural pathways), the risk of infection, brain damage, or rejection is much lower than with traditional brain implants.
- Fast results: Previous therapies could take months or years of training to show tiny improvements. Here, the patient moved within a day.
- Scalable: The technology has now been successfully replicated across four patients and two different hospitals. This suggests it could be taught to other medical centers around the world.
Professor Jia emphasized that this is not just a “technological triumph” but a “new beginning for paralyzed patients.” The team is now planning larger clinical trials with more patients to gather real-world data and improve the AI algorithms.
What’s Next? From the Lab to Everyday Life
The Fudan team is already moving forward. Their next steps include:
- Larger clinical trials: Working with multiple hospitals to test the BSI on more patients with different types of spinal injuries.
- Improving the AI: The current system is groundbreaking, but the team wants to make it faster, more accurate, and able to decode more complex movements (like climbing stairs or turning).
- Miniaturizing the hardware: Today’s system uses external processors. The goal is to make all components implantable and wireless, so patients can walk freely at home without any visible devices.
There is also hope that this technology could help with other conditions. If a brain-spine bridge can restore walking, could a similar bridge restore arm movement? Hand function? Bladder control? These are active areas of research.
However, challenges remain. The technology is expensive. It requires a team of neurosurgeons, AI engineers, and rehabilitation specialists. And it is not a “cure” for all paralysis — it works best when the spinal cord is severed, but the muscles and lower nerves are intact.
Conclusion: The Takeaway Message
The news from Fudan University is not just another scientific headline. It is a fundamental shift in what is possible for people with paralysis. By combining a minimally invasive electrode with an AI that learns in real time, Professor Jia’s team has built a working “nerve bypass” that allowed a man who could not move his legs for two years to walk again within a day.
Here are the key takeaways for the non-scientist:
- A paralyzed patient walked again within 24 hours of receiving a new “brain-spine interface” at Fudan University in Shanghai.
- The surgery is minimally invasive – no open brain surgery. Electrodes are placed inside blood vessels, making it safer than previous technologies.
- Artificial intelligence is the secret ingredient – it learns the patient’s unique brain signals and translates them into commands for the legs in real time.
- This is not a one-time wonder – the technology has now worked in four different patients across two hospitals, proving it can be repeated.
- It offers new hope to an estimated 20 million people worldwide who are paralyzed from spinal cord injuries, many of whom had no realistic treatment options before.
- The future goal – larger trials, better AI, and eventually, a fully implantable, wireless system that allows patients to walk naturally in their daily lives.
For now, for patient Lin and the three others who came before him, the world has changed. The bridge between the brain and the spine has been rebuilt. And for the first time in years, they are taking steps into a new future.
Further Reading: The Global Momentum Behind Brain-Spine Interfaces
The technology behind brain-spine interfaces is not limited to one country. In May 2023, researchers in Switzerland published a landmark study in Nature titled “Walking naturally after spinal cord injury using a brain–spine interface.”
The study demonstrated that a wireless communication bridge between the brain and spinal cord enabled a paralyzed individual to walk naturally again, paving the way for international collaboration in neuro-restorative medicine.
📖 Read the study: Walking naturally after spinal cord injury using a brain–spine interface (Nature, 2023)
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Photo credit: Fudan University, used with attribution. Source
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