Harnessing the body's natural ions can enable secure, wireless low-power transmission of data from bio-implants.
Columbia University researchers assembled two ultrathin, conformable electrodes of gold foil combined with a conductive polymer.
The electrodes function as an in-body transmitter, while a second set of electrodes affixed to the skin operate as receivers.
When the researchers induce an alternating electric potential difference between the transmitter electrodes, the migration of charged ions changes the potential energy stored in the body, which effects a change in voltage across the receiver electrodes so they can read the transmitted signal.
The system can send and decode digital signals at a frequency of 6 megahertz, and requires lower voltages and less power than radio-frequency devices.
From IEEE Spectrum
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