Won medical nanorobots be attacked by the immune system, as soon as they are placed inside the human body?
Immune system response is primarily a reaction to a “foreign” surface. Nanorobot size is also an important variable, along with device mobility, surface roughness, surface mobility, and other factors. Yet the problem of nanodevice biocompatibility is in principle no more difficult than the biocompatibility of medical implants generally. In some ways it may even be an easier problem, because many medical nanorobots will have only temporary residence in the body. Even today, application of immunosuppressive agents during the treatment period would allow poorly-engineered non-bioinactive nanorobots to perform their repair work without trouble. Passive diamond exteriors may turn out to be ideal. Several experimental studies hint that the smoother and more flawless the diamond surface, the less leukocyte activity and the less fibrinogen adsorption you will get. So it seems reasonable to hope that when diamond coatings can be laid down with almost flawless atomic precision, making nanorobot
