PLLA(Poly-L-lactic acid) is a biodegradable material with good bio-absorbability and bio-compatibility. After degradation in the body, PLLA products are excreted by metabolism and thus has no harmful side effects to the human body. It is for these reasons that PLLA products are currently widely used in the field of medicine, such as for one-time infusion equipment, medical surgical suture, drug delivery carriers, tissue engineering scaffolds, bone anchors, injectable microcapsules, microspheres, implants, elastomermaterials for organ support, etc.