Well, that is a little misleading, but a guy who helped develop the software for an AED (Automated external defibrillator) was saved by one when he collapsed while playing basketball. Seems like an interesting premise for a time-travel novel. Man finds out he is going to die in the future. Man goes back in time and invents a device to save his life. Except in this real case, I’m betting he never thought his own work would save his life.