3 ms·

They've existed for quite a while now - https://en.wikipedia.org/wiki/Jet_injector#History https://en.wikipedia.org/wiki/Jet_injector#History

• Aachen 5y ago
  That does not sound pleasant, though it seems they're less painful than needles from a bit of searching around.
  • hhsub 5y ago
    Last jab I got I was sitting and waiting and I was looking around distracted and suddenly I felt the nurse was pushing the cotton already. She had injected me and I didn't feel anything at all. How are needles painful?
    • icegreentea2 5y ago
      It varies on person (including mental state), needle size, and nurse/operator skill. I suspect one bad experience with a needle can prime someone for a poor response in follow up experiences.
      • Aachen 5y ago
        Indeed. Both covid jabs were perfectly fine, it probably doesn't get any more painless than that come to think of it, but I had a regular one in February with a cocktail of various vaccines and that one was much less pleasant.