A Tailorable In-Situ Light-Activated Biodegradable Vascular Scaffold

Area of Science:

• Biomaterials Engineering
• Cardiovascular Research
• Polymer Science

Background:

• Metallic drug-eluting stents (DES) have limitations in treating obstructive atherosclerotic cardiovascular disease.
• Biodegradable vascular scaffolds (BVS) are emerging as a promising alternative.
• The mechanical properties of bioabsorbable polymers are critical for BVS clinical translation.

Purpose of the Study:

• To engineer an in situ light-activated vascular scaffold (ILVS).
• To evaluate the mechanical properties and drug-delivery capabilities of the ILVS.
• To assess the translational potential of the ILVS for vascular applications.

Main Methods:

• Fabrication of ILVS using methacrylated poly-diol citrate (mPDC) and nitric oxide-releasing chitosan (chitoNO).
• In vitro mechanical testing, including radial compression strength.
• In vitro nitric oxide release studies.
• Ex vivo implantation in porcine arteries using a custom catheter.

Main Results:

• ILVS mechanical properties met or exceeded those of commercial bare metal stents (BMS).
• ILVS exhibited higher radial compression strength than BMS, even after 7 months of degradation.
• ILVS with chitoNO demonstrated sustained supraphysiologic nitric oxide release.
• Successful ex vivo implantation in porcine arteries confirmed translational potential.

Conclusions:

• The developed ILVS offers tunable mechanical properties suitable for vascular applications.
• The ILVS platform provides effective drug-delivery capabilities with sustained nitric oxide release.
• Methacrylated poly-diol citrate (mPDC) is a promising material for novel BVS development.