Medical nanites:
Standard medical equipment in virtually every medical facility in the solar system, they can be programmed for different protocols, with each protocol treating a different condition or set of conditions. There are two different varieties. Single Use Medical Nanites, or SUMN, cannot duplicate, and are programmed with a protocol before injection. Because they don't need to be of high quality, they are much cheaper to create than Multiple Use Medical Nanites. MUMN can have their protocol changed by the ANCI of the person they are injected into. They are of much higher quality and therefore cost far more. They also have the ability to duplicate themselves.
The most common protocols for Medical nanites are:
1) Damage repair: Find a damaged section of the body, transport nutrients to the cell in the area, and stimulate the cell's metabolism, accelerating the healing rate. Rated from 1 to 10, with 10 being the maximum rate they are capable of. If the damage is too extensive or they are turned up too high, they may remove so many nutrients from the blood that they either cause malnutrition or death of nearby cells due to lack of nutrients.
2) Cancer fighting: Lock onto cells producing protein markers that only cancer cells produce, then cut the cell wall so they die. Rated 1 to 10. Turning it up too high may overload the blood with toxins from the dead cells.
3) Duplicate: Build a copy of a random nanite in the area. Repeat until you're told to stop. Rated 1 to 10. Because they build them with things in the blood, they may cause nutrient deficiency, especially with minerals.
4) Digestion: Break up food and place the nutrients into the bloodstream. Rated 1 to 10.
5) Blood regeneration: Move nutrients to the bone marrow, so that it makes more red blood cells. Rated 1 to 10, with the same possible problems as Damage Repair.