Which device is primarily used for transporting patients while ensuring stability?

The basket stretcher is specifically designed for transporting patients, particularly in difficult terrains or during technical rescues, as it provides stability and support in various scenarios. It is typically used when a patient needs to be moved over rough terrain or from a location that is not easily accessible with standard stretchers.

The short board serves a similar purpose but is often used for patients with suspected spinal injuries. It stabilizes the spine during transport, ensuring that the patient remains immobile while still being able to move them.

The flexible stretcher, while versatile and useful for moving patients in confined spaces, does not provide the same level of structural support as the basket stretcher or short board.

Considering the context of the safety and stability during patient transport, all of these devices play a role, depending on the specific circumstances of the rescue. That's why the answer includes all options, as each device has its unique advantage in ensuring patient stability during transport while adapting to various situations.