I find this device, a wearable medical sensor, fascinating:
The device features nine sampling needles, each only 800 millionths of a meter (microns) in height, and beneath them, a fluidic channel that can draw interstitial fluid over nine gold disk electrodes. Each disk can be tailored to detect a different analyte. The microneedles are so tiny that they don’t traumatize nerves when pressed into the skin. It also samples only interstitial fluid, the liquid between skin cells, so, it could be used for long-term, noninvasive use, they said.
The aspects I find interesting are not just its size but a) it doesn’t sample blood but the liquid between the skin cells; and b) it’s suitable for continuous sampling, something pretty hard to do with blood.
I can’t help but wonder if these long-term, real-time measuring devices won’t represent a completely new horizon in medical research.