Most surgical instruments are made of stainless steel, but other materials such as titanium, silver, and heavy metals such as tungsten carbide. The grades of stainless steel used are generally 400 and 300 stainless steel.　

1. Carefully check whether the instrument is damaged, such as fracture, deformation, damage, etc., if there is damage, it should be replaced in time.　

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Prepare surgical instruments and sutures: Before surgery, you need to prepare the required surgical instruments and sutures. Needle sutures usually consist of a needle and one or more threads, with one end of the needle with a barb for easy threading through the tissue, while the other end of the thread can be knotted or attached to a sutter.