Interface Engineering of Fully Metallic Stents Enabling Controllable H2O2 Generation for Antirestenosis
- Interface Engineering of Fully Metallic Stents Enabling Controllable H2O2 Generation for Antirestenosis
- 석현광; 김유찬; 옥명렬; 전호정; 한형섭; 박지민; 서현선; 최종훈; 김은실; 서영민; 김경수; 정연욱; 황혜원; 정고은
- stent; restenosis; reactive oxygen species; hydrogen peroxide; NiTi
- Issue Date
- VOL 35, NO 10-3642
- Despite significant advances in the design of metallic materials for bare metal stents (BMSs), restenosis induced by the accumulation of smooth muscle cells (SMCs) has been a major constraint on improving the clinical efficacy of stent implantation. Here, a new strategy for avoiding this issue by utilizing hydrogen peroxide (H2O2) generated by the galvanic coupling of nitinol (NiTi) stents and biodegradable magnesium– zinc (Mg– Zn) alloys is reported. The amount of H2O2 released is carefully optimized via the biodegradability engineering of the alloys and by controlling the immersion time to selectively inhibit the proliferation and function of SMCs without harming vascular endothelial cells. Based on demonstrations of its unique capabilities, a fully metallic stent with antirestenotic functionality was successfully fabricated by depositing Mg layers onto commercialized NiTi stents. The introduction of surface engineering to yield a patterned Mg coating ensured the maintenance of a stable interface between Mg and NiTi during the process of NiTi stent expansion, showing high feasibility for clinical application. This new concept of an inert metal/degradable metal hybrid system based on galvanic metal coupling, biodegradability engineering, and surface patterning can serve as a novel way to construct functional and stable BMSs for preventing restenosis.
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