Electric pulses through tissue link a rat's motion sensors to nerve implants
Researchers report in Science that SWANS sends electric pulses through body tissue to implants that listen on almost no power. Without large batteries, those implants can be small enough to inject through a syringe.
The Scientist · Science desk
What happened
- The pulse comes from a wearable external hub or from an implant, and it sets up a small current in the tissue around the devices.
- In rats, motion sensors on the front legs triggered an external hub to send signals to nerve implants, and muscles in the back legs contracted.
- Human use waits on evidence that the signals do not disrupt heart rhythm or cause other problems; none has turned up in the rat experiments so far.
Why it matters
- capability A sensing implant could trigger a drug dose or neuron stimulation at the moment it is needed, with Parkinson's disease as Abramson's example of a target.
- constraint Only simple signals pass directly from one implant to another. More complex networks of sensors and devices depend on an external hub, so the elaborate uses keep an outside component.
- exposure Heart-rhythm effects in people cannot be judged from the rat work, which has not covered longer periods or larger animals.
Bluetooth's cost sits in the listening. Science News reports that receiving radio signals takes power even when a device is only listening [3]. That increases the need for battery power and makes devices harder to shrink [3]. Insulin pumps linked to glucose monitors are its example of devices that use Bluetooth today [5]. By the same account, SWANS implants detect the tissue current while using almost no power when they are only listening [11].
In the rat test, motion sensors on the front legs started the chain. When the animals moved those legs, an external hub sent signals through their bodies to neurostimulator implants in the sciatic nerves, and muscles in the back legs contracted [6]. Alex Abramson, a biomedical engineer at Georgia Tech, said the experiment was designed to show that signals could travel through the body and link different kinds of devices [7]. He said it was "a proof of concept showing that you can really connect this system to anything" [8].
The thing this doesn't tell you is the size of any effect. The Science News account does not include a measured listening draw, a range for the pulses, the number of rats, or whether implant-to-implant signalling was tried in them. The comparison with Bluetooth is therefore an argument from mechanism. We think the low-power claim is the better supported of the two advantages, because the account describes how it arises [11]. The range advantage follows from the fact that radio weakens in tissue [4], and we would not size it until the paper's figures are in hand.
Amir Alavi, a materials engineer at the University of Pittsburgh's Swanson School of Engineering, said the network's potential could grow as wearables, AI systems and miniature battery-free implantable sensors improve, including sensors his own lab is developing [15]. "If those pieces eventually come together, you could have implants that are much smaller, simpler, longer-lived, and more connected than what we have today," he said [16].
What to watch
- Longer studies in larger animals that report heart-rhythm effects of the tissue current.
- Measured listening power and signal range for SWANS, set against a Bluetooth link in the same tissue.
- Animal results for implant-to-implant signalling that does not route through the external hub.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence45
- Adoption
- Insufficient
- Hype gap+15
- Incentives
- Insufficient
- Confidence50
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Researchers developed a way for tiny implantable devices to send electrical signals through the body's own tissues, reported September 24 in Science.
- [2]
In SWANS, a wearable external hub or an implant generates an electric pulse that produces a small current in the surrounding tissue.
- [3]
Bluetooth relies on radio signals, and receiving those signals requires power even when a device is only listening, increasing the need for battery power and making devices harder to shrink.
- [4]
Radio signals weaken as they travel through body tissue, limiting how far apart communicating devices can be.
- [5]
Some medical devices, such as insulin pumps linked to glucose monitors, use Bluetooth.
- [6]
Motion sensors were attached to the front legs of rats; when the animals moved their front legs, the system's external hub sent signals through their bodies to neurostimulator implants in the sciatic nerves, causing muscles in the back legs to contract.
- [7]
Alex Abramson, a biomedical engineer at Georgia Tech in Atlanta, says the experiment was designed to show that signals could travel through the body, linking different kinds of devices.
- [8]
"a proof of concept showing that you can really connect this system to anything."
- [9]
Before the network can be used in humans, researchers will need to show that the electrical signals do not cause unintended problems like heart rhythm disruptions; such issues have not turned up in the rat experiments yet.
- [10]
The technology will need to be tested over longer periods of time and in larger animals.
- [11]
Tiny implants can detect the electrical signals while using almost no power when they are only listening.
- [12]
Without large batteries, the implants can be small enough to inject through a syringe.
- [13]
Abramson says a network of smart implants could automatically deliver a drug or stimulate a neuron exactly when needed to treat complex conditions like Parkinson's disease.
- [14]
Simple signals can be sent from one implant to another, while an external hub can coordinate more complex networks of sensors and devices, possibly using artificial intelligence.
- [15]
Materials engineer Amir Alavi of the University of Pittsburgh's Swanson School of Engineering says the network's potential could grow as other technologies improve, including wearables, AI systems and miniature, battery-free implantable sensors like those his lab is developing.
- [16]
"If those pieces eventually come together, you could have implants that are much smaller, simpler, longer-lived, and more connected than what we have today."
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Sources
1 independent publisher whose own reporting we read for this story.
- sciencenews.orgTiny implants can use the body itself to talk to each other
1 article · October 14, 2026
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