The “sonic blade” kitchen knife™

weapon name: the “sonic blade” kitchen knife
description:
weapon special abilities: Non compression sonic separation coupled with a very sharp half serrated blade witch has an automatic sawing action for a superior cutting mechanism
history: ordinary a labor saving product endorsed along the west blue

How could such a thing exist in One piece? And I'm certain using this could get us in legal trouble.

thats what the (tm) is for!

I'm still not so sure that'll fly, I mean you can make a weapon based off of these items, but give it a different name. And still remains the problem of its power source, it runs on electricity, how can you make that work in the world of One Piece?

Don;t they have electric lighting? If not, let me know.

do you want me to give a kitchen knif the oto oto no mi?

If it helps explain things then by all means, go for it! If you can come up with another way, fine too.