1. Texture: According to the texture, sutures can be divided into two categories: natural fibers and synthetic fibers (mainly chemical fibers);
2. Diameter: Based on the worsted thread, whether the suture is single-strand or multi-strand, it can be assumed that its cross-section is regarded as a circle, and a parameter for approximately estimating the diameter;
3. Direction of rotation: It is a parameter introduced to increase the suture strength and sewing regularity, which can be divided into left and right rotation. The simple way to distinguish is to pinch the suture with one hand and keep it still, and twist the hanging part with the other hand. The direction of twisting is the direction of rotation of the thread (left-handed thread is more commonly used);
4. Twist: Sutures are usually made of two or more fibers twisted in one direction. If the twist is large, the strength will increase, and the stability of sewing will be correspondingly weakened. increase;
5. Number of strands: refers to the number of clusters that make up the suture.
