Idea is simple. Implant a divice that can send you GPS location, medical state, amount of oxygen in blood to global server that can make some decisions for you. As example:
1. You feel sick, but don't wanna call 911, cuz it's just ok. No way. Acording to data that was sended to a server periodically or as event, server call 911 for you and use your GPS location.
2. Your kid don't answer for a call for long period. You are in panic. Solutions is simple look where is your kid and what with his health directly on your iPad and make decision what to do next.
3. What about if some bad ass guys wanna kill you. They probably dont wanna do it cuz now finding a proof will be much easier.
Private. Forget that word. Even now you can be founded easy if someone really want to do it: social networks, friends, cameras everywhere...