The patient was moved to a padded cell for his own safety.
padded cell
idiomA room in a mental hospital lined with padding on the walls, and often a cushioned floor, in order to prevent occupants from injuring themselves.
The doctors decided to place the agitated patient in a padded cell to prevent him from hurting himself during the night.
After the patient began striking the walls in a fit of distress, the staff had no choice but to transfer him to a padded cell for his protection.