Where would the liability be, for a technology that introduces no foreign materials whatsoever, to the body? So long as the gen and devices don't electrocute the surgeon or patient, I don't see any liabilities. As long as gen and devices are manufactured to ISO 9000 specs, shouldn't be any problem there, either.
Also, I would imagine liabilities have long been considered and dismissed by Piazza, or he wouldn't be ready to begin selling them. If the man said he could move 'em as soon as they're made, I'd tend to believe HIM sooner than I'd believe YOU! (no offense, of course)