Formation of microcapsules by ultrasound stimulation for use in remote-controlled drug-eluting stents

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Coronary Heart Disease (CHD) remains a global health crisis, with drug-eluting stents (DESs) as a primary intervention.
• In-stent restenosis (ISR) and late stent thrombosis are significant limitations of current DES technology.
• Effective drug delivery systems are crucial for improving DES efficacy and patient outcomes.

Purpose of the Study:

• To develop and evaluate a novel nanoparticle-based drug delivery system for DESs.
• To investigate the use of gold nanoparticles and ultrasonic stimulation for controlled drug release.
• To assess the potential of this system in delaying smooth muscle cell growth and promoting endothelial regeneration.

Main Methods:

• Microcapsules were fabricated using a layer-by-layer technique.
• Gold nanoparticles were incorporated as a shell within the microcapsules.
• Rhodamine 6G dye served as a model anti-restenotic drug to evaluate release kinetics.
• Ultrasonic stimulation was applied to trigger drug release.

Main Results:

• Gold nanoparticles significantly enhanced the efficiency of ultrasonically induced dye release.
• The presence of gold nanoparticles increased the sensitivity of microcapsules to ultrasonic stimulation.
• The developed system demonstrated controlled release of the model drug.

Conclusions:

• Gold nanoparticle-enhanced microcapsules offer a promising platform for controlled drug delivery in DESs.
• Ultrasonic stimulation provides a remote trigger for drug release, potentially improving treatment precision.
• This technology could mitigate ISR and thrombosis, improving outcomes for coronary heart disease patients.