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Georgia Tech team sends signals between injectable implants through body tissue in rats

Researchers reported in Science a system called SWANS that links tiny implants by sending small electrical pulses through tissue instead of Bluetooth. It has been tested in rats and animal tissue, not in people.

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Image: Scientific American
Image: Ars Technica

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The story, neutrally told

Researchers described a networking system called SWANS (Smart Wireless Autonomous Networking System) in the journal Science, in which implants communicate through body tissue rather than by radio. A wearable hub sends voltage pulses into the body, and the body's salty tissue conducts them to injectable implants that contain sensors or actuators. In the most advanced rat experiment, sensors on the front legs triggered an implant that stimulated the sciatic nerve and made the matching hind leg twitch.

Senior author Alex Abramson says Bluetooth and near-field communication drain batteries, weaken in tissue and need antennas that make implants too big to inject. Ars Technica reports the paper puts the battery-life cut from Bluetooth at up to 90 percent. Because the implants use passive components and only a simple signal, they draw almost no power while listening. Ars Technica reports battery life extended more than 15 times, and Scientific American says an actuator triggered daily could last about a year. Signals travelled about 40 centimetres in the rat study, and in pork belly a 10-volt pulse produced a detectable gradient over more than 30 centimetres.

Limits include small data capacity, the need to tune voltage thresholds for each body and implant placement, and no testing yet in large animals or humans. Purdue's Hyowon Lee, who was not involved, says humans' bulk may shorten the signal range and that spoofing a wearable could be a security risk. On safety, Abramson says pacemakers already use similar voltages, and in a two-month rat study the pulses did not stimulate other nerves or change heart activity. Scar tissue up to a millimetre thick formed around the implants.

Every sentence links to the reporting it rests on.

Left2 outlets

Framing
Both outlets present the work as a promising engineering advance that treats the body as a communication network, and both set out its limits.
Emphasis
Scientific American stresses the nervous-system analogy, the range limit and an outside expert's caution. Ars Technica stresses how the hardware works, power savings versus Bluetooth, and safety results.
Leaves out or plays down
Scientific American leaves out the chicken and pork tests, the 15-fold battery figure and the safety data. Ars Technica leaves out independent expert comment and the earlier BION trials.
Charged language
“digital nervous system”“the body as a shuttle”
For example
“It’s a bid to build a sort of digital nervous system for medical devices.” — Scientific American
“But SWANS is not a do-it-all in-body communication system, and it likely never will be.” — Ars Technica

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