PLGA, also known as polyhydroxyacetic acid, is a novel biodegradable material that can be completely degraded into non-toxic glycolic acid within 4-6 months in the body. It has high mechanical strength and biocompatibility, and is commonly used in absorbable surgical sutures, drug carriers, and tissue engineering scaffolds. According to the ratio of lactide and ethyl ester, they are divided into types such as 50:50, 75:25, 25:75, etc.