Are negative ion devices considered medical instruments? Need to have specific documents!

Some are applied in hospitals, some positioning is electrical appliances, mainly depends on the product positioning it. However, the choice of negative ion equipment is best to pay attention to the ozone, because the ordinary negative oxygen ion generator are using steel needles or ordinary carbon fiber as the release of the tip, which will produce ozone, only the use of nano fullerene anion releaser this technology to avoid ozone production.