Battery-free, stretchable optoelectronic systems
LINK
I've been doing a lot of research lately on wearables and I've been finding more and more that can be applied to implants. This paper[linked at top] describes a skin-like encased heartrate monitor that is battery free and wireless. It's read through NFC and attaches to the skin like a sticker or temporary tattoo. It seems like it should be relatively trivial to encase it in biocompatible material and put it under the skin instead of over.
I'm working through some ideas right now about how to more integrate wearables and implants.
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This system requires a phone with NFC for power so it's not suitable for constantly monitoring anyone's heart rate. If you gained reliability by reading the underside of the skin then I could see the advantage.
I'm interested to see where this goes. In the meantime, my phone, Samsung Galaxy S6 Active has a heart rate sensor and oximeter built in. However, the NFC on this phone is rubbish. The latest version S7 has the same sensor suite.
http://mashable.com/2017/03/06/electroconductive-ink-tattoo-monitor-health/#Z01bX_ibuqqc