There is a US patent for a micro needle device administered through the nose
Microneedle nasal delivery device Abstract The invention is directed to a nasal delivery device comprising one or more microneedles, and to methods of nasally administering a composition with a nasal delivery device comprising one or more microneedles https://patents.google.com/patent/US20130085472A1/en View post on imgur.com “ Microneedle-mediated nose-to-brain drug delivery for improved Alzheimer’s disease treatment.” https://matilda.science/work/91e59c97-582f-4e90-bca2-642643723dd6?l=fr h/t A …