The BioStent: novel concept for a viable stent structure.

Area of Science:

• Biomaterials Science
• Vascular Tissue Engineering
• Medical Device Innovation

Background:

• Percutaneous stenting of small peripheral vessels has unsatisfactory patency rates due to in-stent restenosis.
• Current stenting techniques often fail to maintain long-term patency in challenging vascular anatomies.

Purpose of the Study:

• To introduce the BioStent concept for overcoming in-stent restenosis in small-caliber vessels.
• To create a stented vascular graft with a functional endothelial cell layer by integrating a stent within engineered tissue.

Main Methods:

• Fabrication of small-caliber BioStents (Ø=6 mm) using a nitinol stent cast within a fibrin/vascular smooth muscle cell mixture.
• Luminal endothelial cell seeding and bioreactor conditioning to promote tissue integration.
• Histological analysis and scanning electron microscopy to evaluate tissue remodeling and endothelial coverage.

Main Results:

• The BioStent demonstrated non-cytotoxicity and no adverse effects on cell proliferation.
• Complete integration of the nitinol stent within a viable, engineered tissue structure was confirmed.
• A smooth, confluent luminal endothelial cell lining was achieved and maintained after crimping and release.

Conclusions:

• The BioStent represents a platform technology for generating viable, self-expanding stent structures.
• This approach offers a novel solution for improving vascular graft patency by providing a functional endothelial lining.
• The technology is adaptable for various applications requiring specific luminal cell linings.