The Individuals with Disabilities Education Act (IDEA) states that: Assistive Technology (AT) device means any item, piece of equipment, or product system, whether acquired commercially off the shelf, modified, or customized, that is used to increase, maintain, or improve the functional capabilities of a child with a disability. The term does not include a medial device that is surgically implanted, or the replacement of that device. (Authority: 20 U.S.C. 1401(1))