Wheelchair stair stretcher, also known as a stair chair or evacuation chair, is a specialized medical device for safely transporting patients who cannot walk up or down stairs. It combines features of a wheelchair and a stretcher, typically made from lightweight yet strong materials like aluminum alloy, and features wheels for flat surfaces, belts for patient safety, and a folding design for easy storage and transport. Some models may also use a crawler belt system or a motor for easier stair navigation by a single operator.