Coronary Stents: History, Design, and Construction

Area of Science:

• Cardiovascular Medicine
• Biomedical Engineering
• Interventional Cardiology

Background:

• Percutaneous coronary intervention (PCI) has undergone substantial technological evolution over the past four decades.
• Early balloon angioplasty faced challenges like abrupt vessel closure and recoil.
• The development of balloon-expandable metal alloy stents became the standard, followed by drug-eluting stents (DES) to address in-stent restenosis.

Purpose of the Study:

• To review the technological advancements in the development, design, and construction of coronary stents.
• To emphasize the progress in balloon-expandable stents within percutaneous coronary intervention.
• To cover key aspects including stent properties, metal alloys, bioresorbable vascular scaffolds, drug elution, and polymers.

Main Methods:

• This is a review article, synthesizing existing literature and technological developments.
• Focuses on the historical progression and innovations in stent technology.
• Discusses advancements in materials science, polymer technology, and stent design.

Main Results:

• Technological progress has transformed PCI from high-risk procedures to safer interventions.
• Drug-eluting stents (DES) have become crucial in managing in-stent restenosis.
• Current generation DES feature thin struts, improved deliverability, and advanced polymer coatings (biocompatible or absorbable) with excellent safety and efficacy.

Conclusions:

• The evolution of coronary stents, particularly DES, has dramatically improved PCI outcomes.
• Continued innovation in stent design, materials, and drug delivery systems is advancing cardiovascular treatment.
• Future directions likely involve further refinement of bioresorbable scaffolds and enhanced drug-eluting technologies.