> The wearable reader is a magnetic-signal transmitter-receiver about the size of a stack of three or four American Kennedy half-dollars or EU 10-euro collector coins.
begs the question of how much that is in terms of Olympic swimming pools
> So, coating the sensor’s “drum” head with concanavalin A, a bean protein with a strong affinity for sugar molecules, produced a glucose sensor
That sounds like a one-off solution that lasts a few days to a few weeks, and then another implant is needed. I don’t think the proteins at the sensor surface can be recycled during use.
There aren’t that many. Some electronics devices (stimulators) and a particular model of stapes implant. There are some old aneurysm clips and heart valves too, but I’ve never encounter them and the patients may not be alive anymore.
Tricky inplants can usually be scanned in the right conditions (setup, hardware and people).
There are low field magnets coming along that that will improve access further, though the testing of various implants will take time.
begs the question of how much that is in terms of Olympic swimming pools