410 ILCS 620/2.5
"Device" (except when used in Sections 2.11 and 3.10 and subsection (f) of Section 11, subsections (c) and (p) of Section 15, and subsection (c) of Section 19) means instruments, implements, machines, implants, in vitro reagents, apparatus and contrivances, including their components, parts and accessories, or other similar or related articles which are (1) recognized in the official United States Pharmacopoeia - National Formulary or any supplement thereto; (2) intended for use in the diagnosis, cure, mitigation, treatment or prevention of disease or other conditions in man or other animals; or (3) intended to affect the structure or any function of the body of man or other animals; and which do not achieve any of their principal intended purposes through chemical action within or on the body of man or other animals and which are not dependent upon being metabolized for the achievement of any of their principal intended purposes.
410 ILCS 620/2.5