This document proposes using nanotechnology to create artificial red blood cells, called respirocytes, that could deliver more oxygen to tissues than natural red blood cells. Respirocytes would be spherical, 1 micron vessels containing oxygen, carbon dioxide, and ballast water storage tanks, sensors, and a nanocomputer. An onboard fuel cell would power molecular sorting rotors and subsystems using glucose and oxygen. Each respirocyte could store and deliver all of its oxygen, replacing the need for 5.36 trillion natural red blood cells to fully duplicate blood's oxygen capacity. Respirocytes could temporarily replace lost red blood cells in emergencies and also treat various forms of anemia.