Stasis Cells are a medical technology in the Descendants Universe. They hold a person in stasis until they can receive medical attention. They are rated safe for 6-7 days and should not be used for any longer. When used ethically they are able to save lives.
In a far reaching and long spanning program run by Project Tome, descendants with interesting or powerful abilities where placed in stasis for study. In one case this damaged the child's memory and in another it injured the body and left the descendant in the Astral Plane for over a year.
Still more teens are assumed to be or have been keep in stasis far longer that recommended.