ST. LOUIS PARK, Minn. - Don Falk stretched his right arm over his head, past the faint marks where a surgeon sank two wires deep in his brain, to show how uncontrollable tremors in his hand used to slap him awake in the morning. In May, Falk, 52, started to get better with the help of an emerging class of implantable medical devices called neuromodulators tiny machines that stimulate the central nervous system to treat a host of disorders. Analysts say they could be the next big thing for some of the market's hottest medical technology companies.
Cybernetics is getting more advanced. Where is it headed? 
