As I think you're referencing, Investigational Device Exemption status is somewhat parallel to Research Use Only status; the former being used for non-IVD devices, the latter for IVDs.
An IDE-status device is a qualified device per definition; it however is not legally marketable for, or usable in, non-IDE clinical applications.
The IDE and RUO terms crossover to each other to a certain extent. There is a version of the Certificate to Foreign Government process (Form 3613c) that pertains to devices to be used outside of the US for research use, which certifies that the device(s) in question are legally usable for research in the US, but are not legal for US non-research clinical applications and are not intended for outside-US non-research clinical applications.