Nerve Cooling for Analgesia Implant
Check this out:
https://www.science.org/doi/10.1126/science.abl8532
I couldn't find a working sci-hub link. This device uses a bioinert gas to locally cool a nerve. I'm not sure the mechanism behind the cooling exactly but the say it's related to phase-transition and there's mention of having a thermometer on it essentially performing negative feedback so I'd guess it's powered and the temp mediated actively. Apparently, the cooling is minimal enough not to affect control of skeletal muscle but shows promise as a pain treatment in mice. Another interesting aspect is that the whole thing bioresorbable. I mean, I get the extended ribbon with the gas.. but how are they driving this with something resorbable? Gotta get the paper.