The presence of thrombus on the surface of blood-contacting biomaterials in clinical practice can significantly impact both the longevity of the biomaterials and the overall survival prognosis of patients. The administration of anticoagulant and antiplatelet medications may heighten the risk of systemic bleeding. Developing biomaterials with anti-thrombogenetic properties and enabling localized anti-thrombosis may offer a solution to these challenges. The development strategies for anti-thrombogenetic biomaterials can be categorized into three main approaches based on the mechanisms of thrombus formation on biomaterial surfaces: altering physical and chemical properties, designing coatings containing or releasing active substances, and promoting endothelialization. However, due to the intricate and interconnected nature of these mechanisms, biomaterials constructed using a single approach may not effectively prevent thrombus formation. The collaborative intervention of various mechanisms can facilitate the development of biomaterials with enhanced blood compatibility.
Objective The advantages, mechanisms, and advances in nanocomposites for delivering bioactive substances in bone tissue engineering were systematically reviewed. MethodsThis review provides a comprehensive analysis by conducting an in-depth retrieval of relevant literature and integrating it with related work from our research team. ResultsCapitalizing on their inherent size effects and tunable structures, nanocomposites exhibit high drug-loading capacity and controlled/targeted delivery, allowing for the co-delivery of diverse molecules. This smart delivery capability, responsive to specific pathological or external cues, facilitates on-demand precision release to execute multiple therapeutic functions, including osteogenesis, antibacterial action, and immunomodulation. ConclusionNanocomposites demonstrate high delivery efficiency and controlled release kinetics, with the potential for future clinical translation of their multi-signal responsive and spatiotemporally precise drug release capabilities.