From Science:
Wearable and implantable bioelectronic devices are now used to routinely assess a person’s health and, for some conditions, provide interventions as needed. An ongoing challenge is the power and device size required for wireless communication between devices. Ghanim et al. designed an electronic circuit that emulates the functionality of a nervous system. The researchers were able to remotely trigger electrical stimulation devices through pulsed signals transmitted through body tissue using less power than protocols such as Bluetooth. Implants could be injected using a syringe, and multiple devices could be controlled by using different signal patterns.
More here.
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