Robert Frietas, a researcher at Zyvex and a former fellow of the Institute for Molecular Manufacturing, writes in most recent issue of _Pathways_ magazine:

In just a few decades physicians could be sending tiny machines into our bodies to diagnose and cure disease. These nanodevices will be able to repair tissues, clean blood vessels and airways, transform our physiological capabilities, and even potentially counteract the aging process.

Nanomedicine: Robots in the bloodstream