What are those bed things that they use in ambulances?

Stretcher

A stretcher is a device used to transport sick or injured people. It is typically made of a metal frame with a canvas or nylon top. Stretchers are often used by emergency medical services (EMS) personnel to transport patients to and from ambulances or other medical facilities. They can also be used to transport patients within a hospital or other healthcare setting.

Stretchers come in a variety of sizes and shapes to accommodate different types of patients. Some stretchers are designed to be collapsible for easy storage and transport. Others are equipped with wheels or tracks to make them easier to move.

Stretchers are an essential piece of equipment for any emergency medical service or healthcare facility. They provide a safe and comfortable way to transport sick or injured people.