Interesting, thanks! Especially the bit about the glass: I didn’t know it actually made a difference in body reaction. I was under the impression that glass was pretty much inert whatever the glass, unless it was heavily loaded with metal.
I’m knee-deep in case reports of deep Implanon / Nexplanon reports at the moment. That particular implant is really useful for my own research: it’s much easier to find cases of deep implantation of that device than RFID or magnet implants.