Israel’s NanoPass (see here) is partnering Korea’s Micro2Nano to mass-produce the world’s smallest needles.  The tiny needle uses standard syringes, allowing intradermal (between the skin layers) injections, including for coronavirus. These are painless and elicit a better immune response.

https://jewishbusinessnews.com/2022/01/03/nanopass-developed-the-worlds-painless-smallest-medical-needle/