It is very simple, cool the nerves and relieve pain. This would be applied in particular after a surgery, lessening the need for painkilling drugs. Especially the opiate kind of drugs. “Overuse of those drugs has led to an opioid crisis; more than 70 percent of drug overdose deaths in 2019 involved an opioid.”

This is great tech.

Nerve Coolers: Pain Relief Without Drugs – Implantable miniaturized device could help patients with postsurgical pain avoid addictive opioids