The requirement of silk suture: 1. During the wound healing process, it can maintain sufficient strength, and it should be able to stretch to adapt to the edema of the wound, and shrink back to the original length as the wound retracts. 2. After wound healing, it can degrade and absorb itself, leaving no foreign body. 3. No inflammation. 4. Non-irritating and carcinogenic. 5. Easy to dye, sterilize and disinfect. 6. Safe and strong knots can be formed. 7. Easy to make, low price and high production.

