Carboxymethyl chitosan Methacryloyl (CMCSMA) is methacrylated carboxymethyl chitosan with properties as a 3D printing ink. A composite hydrogel made of Carboxymethyl chitosan Methacryloyl can effectively accelerate bone healing in an infectious microenvironment after implantation in a rat model of Staphylococcus aureus-infected femoral defect^[1].