Absorbable sutures are divided into single-strand absorbable sutures and multi-strand absorbable sutures according to their physical form, and natural sutures and synthetic sutures according to the source of raw materials. Natural sutures are prepared from healthy mammalian collagen, or synthetic polymers, including animal tendon sutures, sheep intestine, silk and cotton silk sutures, and are degraded by digestion with relevant enzymes in the body. Synthetic absorbable sutures include nylon, polyethylene, polypropylene, and metal tantalum threads, etc. The most popular and widely used are polylactic acid, polyglycolic acid, poly(lactic acid) ethanoate, and poly(p-dioxanone), etc., which are implanted in the body by virtue of their biocompatibility and can be completely degraded and absorbed by the body through hydrolysis over a period of time, so that patients do not need to remove the sutures and can reduce pain. The patient does not need to have the stitches removed, which reduces pain.