Firstly, it is necessary to ensure necessary disinfection and cleaning before use to prevent further contamination of the injured wound. After determining the selection, type, and appropriate length of the hemostatic band, find a suitable position to wrap the band above the bleeding area. Taking the arm as an example, the band should be wrapped around the thicker muscle area of the arm. Be careful not to wrap too tightly or too loosely to avoid affecting the hemostatic effect or causing other injuries.

Next, the tourniquet should be slowly and steadily tightened to maintain appropriate tension. During this process, the patient's physical reaction and hemostatic effect should be closely observed. Once discomfort or uncontrolled bleeding is detected, the use of the tourniquet should be immediately adjusted or stopped. At the same time, for any open arterial wounds or deeper incisions, tourniquets should not be the only treatment method, and medical attention should be sought as soon as possible and more comprehensive treatment measures should be taken.

In short, the correct use of tourniquets is of great significance for controlling severe bleeding and protecting the safety of patients' lives. However, attention should also be paid to the potential risks and side effects that may arise during use. Therefore, before use, it is necessary to fully understand its usage methods and precautions, and to operate under the guidance of professional medical personnel as much as possible. In emergency situations, if it is not possible to seek medical attention in a timely manner, one should first learn and prepare through self judgment or through channels such as the internet to ensure effective emergency treatment can be provided before professional medical personnel arrive.