The word itself is an industry term, the interpretation of different occasions is not the same, the real classification of medical devices is not according to the high and low end to divide.
Medical devices are divided into three categories, of which class I is implanted in the human body (except condoms, huh?), class II is to be strictly regulated, class III is not too much to do with the human body, do not need to be too strictly regulated, retail stores can sell (such as thermometers). As for the strict official explanation, you can find in the national "medical device supervision and management regulations".
Generally speaking, that kind of fat shaking machine should belong to the word "health equipment", that is, health care equipment. If you want to confirm the bottom of a product belongs to what, to look at its approval number "mechanical quasi-character" is a medical device, "food and health approved word" is a health care products.