A medical device is 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 specified 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 providing information by means of in vitro examination of specimens derived from the human body), and which does not achieve its principal intended action by pharmacological, immunological or metabolic means. Software intended for medical purposes is itself a device.