Triangular needles and circular needles are surgical needles used clinically to suture tissues. In general, the difference between circular needles and triangular needles are mainly the following: First, the difference in appearance, the tip of the cone is more rounded and blunt, the damage to the tissue is smaller, and can be divided into large triangular needles and small triangular needles according to the model. While the tip of the triangular needle is triangular, the tip is very sharp. Triangular needle can also be divided into large triangular needle and small triangular needle. Second, the difference in use, because the tip of the triangular needle is sharper, mainly used for interrupted suturing of tough tissues such as skin and skin reduction sutures. Third, the tip of the triangular needle is more rounded, less damage to the tissue, so the triangular needle is widely used for intra-abdominal intestinal anastomosis, repair of digestive tract perforations, closure of the peritoneum, ligation of blood vessels, etc. Depending on the tissue to be sutured, different models of different sizes can be selected.