“…Various hemostatic agents (e.g., powder and hydrogels) have been widely designed for the wound hemorrhage. − In some cases, bleeding after tissue puncture with syringe needles could cause psychological fear in patients, especially for children. Further, it increases the risk of local or systemic complications (e.g., subcutaneous bruises, swelling, nerve damage, and uncontrolled bleeding) in patients suffering from hemophilia, Von Willebrand disease, vitamin K deficiency, rat poisoning, warfarin poisoning, and disseminated intravascular coagulation. , Recently, a self-sealing hemostatic needle coated with catechol-conjugated chitosan has been reported for antibleeding after tissue puncture via solid-to-gel phase transition of catechol-functionalized chitosan. , However, the preparation process of hemostatic needles either involved complex modification of polymers or an oxidative preincubation process of 3 days to achieve hemostatic functions. Sodium alginate and CaCl 2 have been also used to decorate hypodermic needles, which also exhibit hemostasis during tissue puncture. , Nevertheless, the coating detached from the needle surface only serves as a physical barrier to prevent bleeding without affording antibacterial activity, while infection occurs more often at punctured sites and obstructs the healing of the punctured tissue.…”