You can't program a nanobot to fix a problem you don't understand. You can't program a microchip to regulate brainwaves you don't understand. Figuring this stuff out is no trivial thing. Knowing what we'd want these devices to do is more than a ten year project even if we could build them that quickly.
Closer than you think. The following was from 2009...
From:
http://www.dailymail.co.uk/sciencet...ee-particles-venom-target-diseased-cells.html
It's a terrifying prospect - a swarm of bees engulfing a victim to inflict hundreds of potentially lethal stings. Scientists, however, have taken the idea and used it to inspire a treatment to take on cancer tumours.
They have developed microscopic 'bees' armed with the poison that causes the pain of stings to target cancer cells while leaving healthy tissue unharmed. The 'nanobees' - thousands of times smaller than the width of a human hair - rapidly shrank breast and skin tumours in tests.
They home in on the diseased cells before pumping out the melittin venom, delivering a deadly 'sting'. At their core are beads made from perfluorocarbon, an inert material used in artificial blood. The nanobees are tiny enough to pass easily through blood and attach to cells but big enough to ferry drugs into the body.
Researcher Professor Samuel Wickline said: 'They fly in, land on the surface of cells and deposit their cargo of melittin, which rapidly merges with the target. 'We've shown the bee toxin gets taken into the cells where it pokes holes in their internal structures.'
The nanoparticle packaging stops the melittin doing any damage as it travels to the tumour as well as protecting it from being broken down by the body. Other compounds are added to the package to guide it to exactly where it is needed.
When mice with cancer were given injections, the particles zeroed in on the tumours. Growth of breast tumours slowed by almost a quarter and skin cancer tumours shrank by 75 per cent, the Journal of Clinical Investigation reports.
The two forms of the disease affect more than 55,000 Britons a year and kill 14,000. Many other cancers, including prostate and bowel, may also be cowed by the 'sting'.
Importantly, the drug did not appear to cause side-effects, cutting the risk of symptoms such as hair loss and nausea. Dr Paul Schlesinger, another researcher at Washington University in St Louis, Missouri, said melittin was proving to be a formidable weapon. 'It has been of interest to researchers because, in high enough concentration, it can destroy any cell it comes into contact with. 'Cancer cells can develop resistance to many agents that alter gene function or target a cell's DNA. 'But it's hard for cells to find a way around the mechanism that melittin uses to kill. 'Nanobees are an effective way to package the useful, but potentially deadly, melittin so that it neither harms normal cells nor gets degraded before it reaches its target.'
The scientists said melittin was 'easily and cheaply produced'. They also believe that nanobees could stop the spread of damaged cells which have the potential to become cancerous. Further tests on animals are needed before the nanobees can be given to people and the technology is still several years away from being marketed.