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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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These Tiny Magnetic Robots Repair Broken Spinal Cords Helped Paralyzed Animals Walked Again

Spinal cord injuries are among the most devastating medical conditions. Damage to the spinal cord can lead to paralysis, loss of sensation, and lifelong disability. Unlike many other tissues in the body, nerve cells in the spinal cord have very limited ability to regenerate naturally. Once damaged, they rarely repair themselves, and scar tissue often blocks any attempt at regrowth.

Now, a groundbreaking study from researchers at ETH Zurich and the University of Zurich (UZH) offers new hope. Scientists have developed microscopic, controllable robots capable of delivering stem cells directly to damaged spinal cord tissue. In animal experiments, these tiny robots helped regenerate nerve connections and significantly improved movement.

Published in the journal Nature Materials, the research introduces a completely new way of treating spinal cord injuries—one that combines stem cell therapy, nanotechnology, and microrobotics into a single powerful platform.

Why Spinal Cord Injuries Are So Difficult to Treat

When the spinal cord is injured, communication between the brain and the rest of the body can be disrupted. In severe cases, this interruption causes paralysis below the site of injury.

Scientists have spent years exploring stem cell therapies as a possible solution. Stem cells can potentially develop into new nerve cells and replace damaged tissue. However, existing approaches face major challenges.

Many treatments require implanted electrodes to electrically stimulate transplanted cells. These procedures are invasive and can be risky because the spinal cord is extremely delicate. In addition, transplanted stem cells often fail to survive, integrate properly into surrounding tissue, or develop into functioning nerve cells.

Researchers therefore needed a safer, more precise, and less invasive method to guide and activate therapeutic cells.

A New Generation of Living Microrobots

The Swiss research team developed an innovative solution called NPCbots.

These microscopic biohybrid robots combine living stem-cell-derived neural progenitor cells with specially engineered nanoparticles. The result is a tiny therapeutic machine capable of traveling to an injury site and stimulating tissue repair.

Neural progenitor cells are created from induced pluripotent stem cells (iPS cells). These cells originate from ordinary adult body cells that scientists reprogram in the laboratory, restoring their stem-cell-like abilities. Once reprogrammed, they can develop into various types of cells found in the nervous system.

To enhance these cells, researchers attached advanced magnetoelectric nanoparticles.

The nanoparticles contain two functional layers:

  • An inner magnetic layer that reacts to external magnetic fields.

  • An outer layer that converts magnetic energy into electrical signals.

Together, these components allow the cells to respond to magnetic stimulation and receive electrical signals without any implanted wires or electrodes.

Building a Laboratory on a Chip

Creating millions of these tiny robots requires remarkable precision.

Researchers manufacture NPCbots using specialized lab-on-a-chip systems. The entire fabrication process takes place on surfaces measuring only about one square centimetre.

The process begins by trapping neural progenitor cells in a small central reservoir. Magnetoelectric nanoparticles are then introduced and allowed to bind naturally with the cells.

According to the researchers, the entire assembly process takes only about thirty minutes.

Each finished NPCbot measures roughly six micrometres in size—far smaller than the width of a human hair.

To produce enough NPCbots for experiments, multiple lab-on-chip devices operate simultaneously. This scalable manufacturing approach enables researchers to generate hundreds of thousands of microrobots for laboratory studies and millions for animal testing.

Remarkable Results in Zebrafish

The first major test involved zebrafish larvae, a species widely used in regenerative medicine research because of its ability to heal nervous system injuries.

Researchers created spinal cord injuries in the fish and then injected NPCbots directly into the damaged area. External electromagnetic fields were applied to activate the nanoparticles and stimulate the stem cells.

The results were striking.

Within just three days, the injured zebrafish displayed nearly normal swimming behavior. Their movement patterns and exploratory activity closely resembled those of healthy fish.

The experiment demonstrated that the NPCbots could rapidly stimulate cell differentiation and support spinal cord repair.

Success in Mice with Severe Spinal Cord Damage

While zebrafish naturally possess impressive regenerative abilities, mammals do not. For this reason, the researchers also tested NPCbots in mice.

The challenge was much greater. Scientists used mice with completely severed spinal cords—an injury that normally does not heal on its own.

Even under these difficult conditions, the treatment produced impressive outcomes.

After 28 days, researchers observed that nerve cells had reconnected across the injury site. The treated mice gradually regained more normal movement patterns.

Their improvements included:

  • Better walking ability

  • Longer and more stable strides

  • Improved coordination

  • Increased exploratory behavior

These findings are particularly important because mammalian spinal cords generally lack the natural regenerative capacity seen in zebrafish.

Just as encouraging, the treatment appeared safe. Researchers found no signs of significant immune reactions or harmful side effects.

How Magnetic Fields Replace Implanted Electrodes

One of the most innovative aspects of the technology is how it stimulates stem cells.

Traditional approaches often rely on surgically implanted electrodes and wires to deliver electrical signals. Such procedures increase complexity and risk.

NPCbots eliminate this need entirely.

Instead, external magnetic fields are applied outside the body. The nanoparticles attached to the stem cells detect these magnetic fields and convert them directly into tiny electrical impulses.

These electrical signals encourage stem cells to mature into nerve cells and support tissue regeneration.

Because magnetic fields can penetrate deeply into body tissues without surgery, the method is far less invasive. Researchers can also precisely adjust magnetic field strength and frequency depending on the therapeutic need.

This combination of magnetic guidance and electrical stimulation allows doctors to target damaged tissue with exceptional accuracy while minimizing harm to surrounding structures.

What Happens to the Microrobots?

The NPCbots are designed to serve as temporary therapeutic tools.

As the progenitor cells develop into mature nerve cells, the microrobotic structures gradually integrate into the surrounding tissue. Researchers believe the nanoparticles should remain stable and minimally reactive because they are coated with barium titanate.

However, scientists are continuing to investigate how these particles behave over longer periods and whether they eventually break down or are naturally removed from the body.

Long-term safety studies will be an important step before the technology can move toward human clinical trials.

Beyond Spinal Cord Repair

Although spinal cord injuries were the focus of this study, researchers believe the platform has much broader potential.

Because the microrobots can deliver and activate therapeutic cells with high precision, the same technology could potentially be adapted for other medical applications.

Possible future uses include:

  • Heart tissue regeneration after cardiac damage

  • Cancer therapies

  • Accelerated wound healing

  • Treatment of neurological disorders

  • Targeted regenerative medicine applications

The scalable lab-on-chip manufacturing system also makes large-scale production more realistic, increasing the chances that the technology could eventually be used in clinical settings.

A Promising Glimpse into the Future

The development of NPCbots represents a remarkable convergence of stem cell biology, nanotechnology, and robotics.

By combining living cells with magnetically controlled nanoparticles, researchers have created a minimally invasive system capable of repairing some of the body's most difficult injuries. The dramatic recovery seen in zebrafish and mice suggests that this technology could eventually transform the treatment of spinal cord damage.

Human trials remain several years away, and many questions still need answers regarding safety, optimal magnetic stimulation, and long-term outcomes. Nevertheless, the results mark an exciting step forward in regenerative medicine.

If future studies confirm these findings, tiny magnetic microrobots may one day help restore movement, independence, and quality of life for millions of people living with spinal cord injuries around the world.

Reference: Ye, H., Zang, J., Zhu, J. et al. Magnetoelectric microrobots for spinal cord injury regeneration. Nat. Mater. (2026). https://doi.org/10.1038/s41563-026-02625-3

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