Interface Engineering of Fully Metallic Stents Enabling Controllable H₂O₂ Generation for Antirestenosis

Area of Science:

• Biomaterials Engineering
• Cardiovascular Research
• Medical Device Innovation

Background:

• Restenosis, driven by smooth muscle cell accumulation, limits the clinical success of bare metal stents (BMSs).
• Existing metallic stent designs face challenges in preventing post-implantation neointima formation.

Purpose of the Study:

• To develop a novel metallic stent strategy that actively prevents restenosis.
• To utilize controlled hydrogen peroxide (H2O2) generation for targeted inhibition of smooth muscle cells.

Main Methods:

• Fabrication of a hybrid stent using nitinol (NiTi) and biodegradable magnesium-zinc (Mg-Zn) alloys.
• Optimizing H2O2 release through biodegradability engineering and controlled immersion time.
• Surface engineering with patterned Mg coating on NiTi stents for interface stability.

Main Results:

• Successfully fabricated a fully metallic stent with inherent antirestenotic functionality.
• Demonstrated selective inhibition of smooth muscle cell proliferation and function by H2O2.
• Ensured stable NiTi-Mg interface during stent expansion via surface patterning.

Conclusions:

• A hybrid inert metal/degradable metal system based on galvanic coupling offers a new approach to BMSs.
• Biodegradability engineering and surface patterning are key to creating functional and stable antirestenotic stents.
• This strategy shows high feasibility for clinical application in preventing restenosis.