"Need" is a slippery word, and while it is indeed likely that many or most nanoscale tools of future medicine will be fairly directly derived from cells and cel

"Need" is a slippery word, and while it is indeed likely that many or most nanoscale tools of future medicine will be fairly directly derived from cells and cell components, and we could probably achieve all of the design goals for agelessness and disease immunity with those, "medical nanorobotics" is not a nonsense term. It explicitly refers to the design and construction of non-biological nanoscale-featured devices - which is a concept far removed from enzymes. There are some things you can do with these designs that are impossible for presently available or plausible biological machinery. See, for example: http://en.wikipedia.org/wiki/Respirocyte http://en.wikipedia.org/wiki/Respirocyte http://jetpress.org/v16/freitas.pdf http://jetpress.org/v16/freitas.pdf http://www.nanomedicine.com/ http://www.nanomedicine.com/