Yes, Nanotech can be injected directly into our bloodstream.
Nanobots made of nanotech will be injected through bloodstream or tiny spaces in our body.
NanoTech is a manipulation of matter on a nano-scale about 1 to 100 nanometers.
Nanotech substances like Carbon fibers are 10 times stronger and 5 times lighter than Steel.
Richard Feynman introduced the ideas and concepts of nanotech in 1959 at a talk titled “the plenty of room at the bottom.”
So, he is considered the father of nanotech.
Carbon nanotubes are tiny tubes made of rolled-up sheets of carbon with a honey-comb hexagonal structure.
If you take a collection of graphite molecules and roll them then it will become a carbon nanotube.