Final answer:
A portable moving device for carrying a patient in a sitting position is called a stair chair, designed for navigating stairs and narrow spaces safely.
Step-by-step explanation:
A portable moving device used to carry a patient in a sitting position is known as a stair chair. This device is specifically designed to help transport patients down stairs and through narrow corridors where traditional stretchers may not be able to pass. Unlike an ambulance cot or a wheeled stretcher, which is used for patients in a lying down position, or a scoop stretcher, which is used for patients who need to be scooped up with minimal movement, a stair chair is equipped with tracks or skids that allow for easy movement down stairs with the patient seated securely. It ensures safety and comfort for the patient during the transfer.