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The large intestine cancer patients right after the surgery cannot change their body position alone.
Angel wings becomes a flat mat if we only have the same amount of air in the both air pockets. Once it contains the air slowly on the one side, it also sneaks away slowly on the other side.
The one side which contains air, pushes the body of the patient, and the other sneak-way one makes a room for the arms and shoulder, so patients get to feel more comfortable.
Additionally, they can also turn over their bodies peacefully, since the air tube and the medical tubes around the waist can all entered into the mattress.