We are familiar with the microbot that can be injected into the bloodstream or the iPill capsule robot which can be swallowed down the gut to provide medication inside the body. Now, in process to mimic something similar, Justin Eddie, a mechanical engineers at Cleveland, with Osama Ettouney, chairman of the Mechanical and Manufacturing Engineering Department, Miami, is working on developing an implantable microbot which would travel from one location to the other within the human body, delivering nutrition and medication where required.

Eddie is yet far from the nano-sized version of the robot, but on course to research and development has worked out a design with much larger model. After the Macro-size robot, Eddie would now get the nano-sized bot ready which when implanted under the skin or inside the veins, would help deliver insulin dose to the diabetics or detect an increase or decrease in blood pressure to sense an approaching cardiac arrest well in time. The implantable mobile robot would use radio communication to connect with the doctors and care takers outside.
Describing the shape of the nanobot, Eddie says:
If you were to enlarge it, it would look like a capsule, maybe football shaped, and have some sort of propeller for guidance to allow it to move throughout the body, but you wouldn’t see it or feel it.
Via: OxfordPress