Ta ion implanted nanoridge-platform for enhanced vascular responses

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Surface Science

Background:

• Bare metal stents are crucial in interventional cardiology but can cause neointimal hyperplasia due to poor vascular affinity.
• Developing advanced stent surfaces is key to improving outcomes and preventing restenosis.

Purpose of the Study:

• To develop a novel nanoengineered surface for bare metal stents using a target-ion-induced plasma sputtering (TIPS) technique.
• To evaluate the potential of this nanostructured surface to improve endothelialization and reduce neointimal hyperplasia.

Main Methods:

• Fabrication of a tantalum (Ta) ion-implanted nanoridged surface on cobalt-chromium (Co-Cr) stents using TIPS.
• In vitro assessment of cellular responses, including endothelialization, platelet activation, and blood coagulation.
• In vivo evaluation in a rabbit iliac artery model to assess re-endothelialization and neointima formation.

Main Results:

• The TIPS technique successfully created a Ta-implanted nanoridged surface with good structural integrity and mechanical stability.
• In vitro studies showed rapid endothelialization and low thrombogenicity on the treated surfaces.
• In vivo results demonstrated accelerated re-endothelialization and significantly reduced neointima formation compared to bare stents.

Conclusions:

• The Ta ion-implanted nanoridge platform fabricated via TIPS shows significant potential for preventing in-stent restenosis.
• This nanoengineering approach offers a viable strategy for enhancing the long-term patency of bare metal stents.