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Drug-delivery coatings for medical devices represent a specialized class of functionalized biomaterials engineered to serve as localized reservoirs for the controlled release of therapeutic agents directly at the site of clinical intervention. These advanced surface modifications typically consist of a polymer matrix—either durable or biodegradable—or a polymer-free topographical architecture designed to encapsulate active pharmaceutical ingredients such as anti-proliferative, anti-thrombogenic, or antimicrobial agents. By modulating the physicochemical properties of the coating interface, these systems achieve precise elution kinetics that maintain therapeutic concentrations within the target tissue while minimizing systemic toxicity and off-target effects. In clinical practice, these coatings are integral to the performance of intravascular stents, drug-coated balloons, and orthopedic implants, where they function to suppress inflammatory responses, prevent restenosis, or inhibit biofilm formation, thereby significantly enhancing the long-term biocompatibility and therapeutic efficacy of the underlying medical hardware.
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