Polar cutaway view of respirocyte. The equatorial bulkhead lies in the plane of the image, and we are looking down through the north pole of the device. Prominent black rectangles represent power plants that drive each of the 12 pumping stations; utility conduits connect pumping stations to the central computer.
Robert A. Freitas Jr., "Respirocytes: High Performance Artificial Nanotechnology Red Blood Cells," NanoTechnology Magazine 2 (October 1996):1, 8-13 (11); Robert A. Freitas Jr., "Exploratory Design in Medical Nanotechnology: A Mechanical Artificial Red Cell," Artificial Cells, Blood Substitutes, and Immobil. Biotech. 26 (1998):411-430 (422).