A device small enough to pass through a needle could open a new chapter in chronic pain treatment. Researchers at New York University Abu Dhabi and Cleveland Clinic Abu Dhabi have developed a miniature implant that stimulates nerves without an internal battery or connecting wires.
Their experiments produced measurable muscle responses in anesthetized rats, offering an early demonstration of the technology. But an important distinction remains: scientists have not yet tested whether the device can relieve pain.
The findings appeared in Science Advances on June 12, 2026, before gaining renewed attention in October.
Known as SEED, the implant measures just 1.4 millimeters across and 9 millimeters long. It fits through a standard 14-gauge needle and receives power wirelessly from equipment outside the body.
The research demonstrates a new way to deliver electrical nerve stimulation, with potential applications in chronic pain treatment that remain untested.
How a Tiny Device Can Stimulate Nerves Without a Battery
SEED delivers controlled electrical signals to peripheral nerves wirelessly, without an implanted battery.
The technology builds on an existing medical approach. Peripheral nerve stimulation is already used to manage certain chronic pain conditions by delivering electrical impulses to targeted nerves.
But the equipment needed to deliver those impulses can be considerably larger. Some existing systems require surgical implantation of hardware, including power-supply and signal-carrying components.
SEED takes a different approach.
Instead of carrying its own power supply, the implant receives energy from an external transmitter through resonant inductive coupling. Magnetic fields transfer the energy, which the device converts into electrical pulses.
The system operates at a carrier frequency of 65 kilohertz. Researchers can adjust the frequency, pulse width, and amplitude of the stimulation, giving them control over the electrical signals delivered to nearby nerves.
One essential condition remains: the device works only when the external transmitter is present and properly positioned.
Interestingly, part of its design draws inspiration from injectable identification chips used in animals. Those chips rely on passive electronics, but SEED adapts the principle to stimulate nerves rather than transmit identification information.
What Happened When Scientists Tested the Device in Rats
Researchers demonstrated that SEED could activate the sciatic nerve and produce measurable motor responses in anesthetized rats.
Before reaching that stage, the team had to establish whether such a small device could perform its basic electrical functions.
Laboratory experiments examined its ability to receive wireless energy and generate adjustable stimulation signals. Researchers then evaluated how it operated in biological tissue.
The next step involved living animals.
Scientists positioned SEED near the sciatic nerve in anesthetized rats. This nerve carries signals associated with movement and sensation in the hindlimb, making it a useful target for observing responses to electrical stimulation.
When the researchers activated the external transmitter, the rats produced measurable muscle responses.
Changing the stimulation settings also changed how the nerve responded. The results showed that the device could adjust nerve activation rather than deliver an uncontrolled electrical signal.
The researchers examined whether SEED continued working after being inserted through a needle, another practical requirement for its intended design.
These experiments established that the implant could stimulate a peripheral nerve in a living animal under controlled conditions.
The distinction between nerve activation and pain relief remains crucial. The researchers measured short-term motor responses, not pain behavior, so the results cannot establish whether SEED would help someone experiencing chronic pain.
Related: 10 Agonizing Pains That Can Push the Human Body to Its Limits
The Challenge of Finding Something So Small Inside the Body
Researchers demonstrated that SEED could be located using ultrasound and CT imaging, allowing them to examine its position inside biological tissue.
Making an implant small enough to fit through a needle solves one engineering problem. It introduces another: how do researchers know where the device is once it enters tissue?
That question matters when the goal is to deliver electrical signals near a particular nerve.
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The team investigated the problem using two established imaging techniques.
First, researchers placed the device in chicken leg tissue and examined it using ultrasound. Despite its tiny dimensions, the implant remained visible against the surrounding biological material.
They also used micro-computed tomography to examine a device implanted in a rat. The resulting images allowed them to identify its location and observe details of its construction.
Together, the experiments showed that shrinking the device did not make it impossible to locate through medical imaging.
That finding adds an important practical dimension to the research. A miniature nerve stimulator must do more than generate electrical pulses; researchers also need a way to assess where it has been placed.
Why Chronic Pain Is Part of the Bigger Picture
The scientists hope their miniature device could eventually help treat nerve-related conditions, including chronic pain, but that remains a research goal.
The interest in chronic pain is understandable.
According to the Centers for Disease Control and Prevention, 24.3% of American adults reported chronic pain in 2023. The statistic reflects the scale of the condition, but it doesn’t indicate how many people might benefit from this technology.
Electrical nerve stimulation already has a place in treating certain pain conditions. SEED explores whether the technology needed to deliver that stimulation can be made smaller and inserted through a needle.
For the researchers, that design is part of a broader ambition.
Professor Khalil Ramadi, the study’s senior author, described the work in a statement accompanying the findings.
“This work represents a shift in how we think about treating nerve-related conditions.”
Dr. Mohamed Elsherif, the study’s first author, offered another perspective on where the technology might lead.
“This technology has the potential to bridge the gap between non-invasive therapies and traditional implants.”
Both statements reflect what the researchers hope to achieve, rather than benefits demonstrated in the experiments.
SEED’s distinctive feature is its approach to stimulation delivery. By placing a small passive device near a nerve and keeping the power source outside the body, the researchers have demonstrated an alternative equipment arrangement.
Whether that arrangement could offer practical advantages for people receiving pain treatment is a separate question.
What Still Stands Between SEED and Chronic Pain Treatment
The next challenge is determining whether SEED’s demonstrated nerve stimulation capabilities can support further research into chronic pain treatment.
So far, the researchers have shown that their implant can receive external power, generate adjustable electrical pulses, and activate peripheral nerves in anesthetized rats.
They have also demonstrated its compatibility with medical imaging under experimental conditions.
What remains unknown is how the device would perform over longer periods, whether it could remain stable inside human tissue, and how suitable it might be for clinical procedures.
The research reported no human clinical results or confirmed date for commercial availability.
Before researchers could consider SEED a chronic pain treatment, they would need evidence that it can influence pain responses, followed by studies evaluating its effectiveness and safety.
Still, the achievement deserves attention for what it actually demonstrates.
Scientists have taken functions traditionally associated with more substantial implanted hardware and demonstrated controlled nerve stimulation through a device small enough to enter the body through a needle.
The next question is no longer simply how small such a device can become. It is what researchers can establish about its function beyond the laboratory.
What possibilities could miniature nerve-stimulation devices like SEED open for the future of chronic pain research?
