The Medical Device is defined in EU MDR. This is the category of medical device which is general. 
The concept of "medical device’ is defined in EU MDR as "Any instrument, apparatus, appliance, software, implant, reagent, material or other article intended by the manufacturer to be used, alone or in combination, for human beings for one or more of the following specific medical purposes:
• diagnosis, prevention, monitoring, prediction, prognosis, treatment or alleviation of disease
• diagnosis, monitoring, treatment, alleviation of, or compensation for, an injury or disability
• investigation, replacement or modification of the anatomy or of a physiological or pathological process or state
• providing information by means of in vitro examination of specimens derived from the human body, including organ, blood and tissue donations, and which does not achieve its principal intended action by pharmacological, immunological or metabolic means, in or on the human body, but which may be assisted in its function by such means."