First, read the English article below.

Sterile saline, such as that found in first aid kits, is the ideal substance for flushing a contaminated wound. The physical act of washing removes the bacteria and debris, while the saline is so similar to the pH of the body tissues that it causes minimal tissue damage. The trick to using saline is to use large volumes and keep washing until the area looks clean. For a very dirty wound with lots of mud or gravel in it, an alternative is to boil water and then let it cool. Use this water to literally wash the area clean. There is a slight risk using water that it will damage the exposed tissue bed, as it does not have the same composition as body fluids and therefore draws fluid out of damaged tissue. However, medical studies have shown that using tap water to irrigate a wound does not have a huge impact on whether the wound eventually gets infected. Salt water has natural disinfectant properties and is a good standby for cleaning a cat's wound. To make a salt water solution boil the kettle, measure out a cup of water,and add half a teaspoon of salt. Then stir to dissolve and leave to cool. This salt water is also around the same composition as tears and body fluids, so it is less damaging to exposed tissue than commercial disinfectant solutions or water alone. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Mua dung dịch muối vô trùng. Đun sôi nước và để nguội trước khi rửa vết thương. Pha nước muối.