Novel fully bioabsorbable salicylate-based sirolimus-eluting stent

Area of Science:

• Cardiovascular Research
• Biomaterials Science
• Medical Device Engineering

Background:

• Permanent metallic stents can lead to late stent thrombosis.
• Biodegradable stents offer a potential solution to mitigate these risks.
• A novel fully bioabsorbable sirolimus-eluting stent (SES) was developed using a unique salicylic acid polymer.

Purpose of the Study:

• To evaluate the safety and efficacy of a new fully bioabsorbable SES in a clinically relevant animal model.
• To assess the mechanical performance, vascular compatibility, and degradation profile of the stent.
• To investigate the healing response of the arterial wall following stent implantation.

Main Methods:

• Forty-five biodegradable balloon-expandable stents were implanted in porcine coronary arteries.
• Quantitative coronary angiography (QCA) and intravascular ultrasound (IVUS) were used to assess stent deployment and apposition.
• Histological analysis and optical coherence tomography (OCT) were performed at various time points (7-180 days) to evaluate healing and degradation.

Main Results:

• Successful stent deployment with good apposition was achieved in all cases.
• Angiographic and IVUS/OCT assessments showed minimal stenosis and good vessel healing.
• Histology confirmed favorable stent incorporation into the arterial wall without significant thrombotic or inflammatory reactions.
• In vitro studies showed sirolimus elution over 30 days and complete stent degradation over 12 months.

Conclusions:

• The novel salicylate-based SES exhibits favorable vascular compatibility and efficacy.
• The stent demonstrates good mechanical performance and long-term vessel wall apposition.
• These encouraging preclinical results support further investigation in advanced preclinical and early clinical studies.