I think you might have opened a new can of worms!
There are lots of problems associated with the use of switch mode power supplies, as the output often floats at about 50% of the input voltage. ANY smps's used in patient areas should comply with 60601. I have a voltstick that I run over all such things as a quick check. That includes laptops, mobile phone chargers and so on. Some of these things can pack quite a punch.
If patients are allowed to bring these sort of things in, perhaps you need to think about how you deal with the problem!
