The theoretical concept of artificial blood cells as a part of innovative nanomedicine came from nanotechnology expert Robert A. Freitas. The so-called respirocytes are in fact enhanced alternatives of the organic blood cells and the microbivores are the artificial counterparts of the white blood cells. Respyrocytes are spherical nanobots made up to 18 billion atoms arranged as a tiny pressure tank, which would be filled up Microbivore nanobots are artificial phagocytes. The practice of this concept could be open to new ways of biomedical therapies such as cancer treatments, cardiovascular interventions, drug and gene delivery, bioimaging.