Understanding Stents: Types, Benefits, and Risks for Patients

January 18, 2026

Stents play a crucial role in restoring blood flow, stabilizing vessels, and supporting long-term vascular health. Used widely in cardiology, peripheral interventions, and other vascular specialties, stents provide structural reinforcement to narrowed or weakened vessels to prevent life-threatening complications.

For patients and healthcare providers alike, understanding the different types of stents—and their associated benefits and risks—is essential for making informed treatment decisions. For device developers, these insights help guide innovation, safety evaluations, and preclinical study design.

This guide outlines the most common stent types, their clinical applications, and the considerations that influence patient outcomes.

Key Takeaways

Stents are devices used to keep blood vessels open and maintain healthy blood flow.
Options include bare-metal, drug-eluting, bioresorbable, and specialized stents for coronary and peripheral use.
Clinical benefits range from reduced symptoms to improved long-term survival.
Like all medical implants, stents carry risks that must be evaluated through rigorous preclinical and clinical testing.

What Is a Stent?

A stent is a small, expandable device used to support the inside of a blood vessel or duct. Most vascular stents are metallic or polymer-based mesh tubes deployed using a catheter system. Once expanded, the stent remains in place permanently—or, in the case of dissolvable stents, until the material safely resorbs. Stents are primarily used to treat:

Coronary artery disease
Peripheral artery disease
Aneurysms or vessel weakening
Obstructions in large arteries
Vascular injuries or dissections
Blocked urinary pathways, such as a ureter obstructed by a stone or tumor
Narrowed airways in the trachea or bronchi

Stent design varies based on the anatomy, disease state, and mechanical demands of the vessel or duct being treated.

Common Types of Stents

Bare-Metal Stents (BMS)

One of the earliest stent types, bare-metal stents provide mechanical support without drug coatings. Features:

Stainless steel or cobalt-chromium structure
Good radial strength
Lower cost compared to drug-eluting variants

Use: Helpful for patients who cannot tolerate prolonged antiplatelet therapy.

Drug-Eluting Stents (DES)

These stents release medication to reduce the risk of restenosis (vessel re-narrowing). Features:

Polymer coating loaded with antiproliferative drugs
Controlled drug release over weeks to months
Lower restenosis rates compared to BMS

Use: Standard of care for coronary artery disease due to superior long-term outcomes.

Bioresorbable Stents

Designed to gradually dissolve after maintaining vessel support. Features:

Polymer or magnesium-based
Resorb over 1–3 years
Leave behind a fully restored vessel

Use: Potential for younger patients or lesions where long-term metal presence is undesirable.

Peripheral Stents

Engineered for larger vessels in the legs, pelvis, or other peripheral arteries. Features:

Nitinol self-expanding structure
High flexibility to withstand external forces
Designed for dynamic anatomical environments

Use: Treatment for peripheral artery disease and vascular narrowing outside the heart.

Covered (Stent-Graft) Stents

These stents are wrapped in graft material to seal aneurysms or prevent vessel rupture. Features:

Metal scaffold + PTFE or similar graft material
Used for complex vascular pathologies

Use: Aneurysms, dissections, perforations, or vessel trauma.

Non-Vascular Stents

Not every stent sits in a blood vessel. Ureteral stents keep urine flowing from the kidney to the bladder when a stone, tumor, or swelling blocks the ureter. Airway stents hold open a trachea or bronchus narrowed by disease or scarring. Biliary and esophageal stents apply the same principle in the digestive tract. Because these devices sit in fluid-filled or air-filled passages rather than in blood flow, they face different design demands, such as resistance to encrustation, migration, and tissue overgrowth.

How a Stent Is Placed

Most vascular stents are placed through a minimally invasive catheter procedure rather than open surgery.

The physician first makes a small puncture, usually in the groin or wrist, to reach a major artery. A guide catheter is threaded through the vessels to the narrowed area, and contrast dye injected through it makes the blockage visible on X-ray, a step called angiography. A thin guidewire is then passed across the narrowing, and a balloon catheter carrying the compressed stent is advanced over the wire into position.

Inflating the balloon expands the stent against the vessel wall, where it stays to hold the artery open. Self-expanding stents, which are common in peripheral vessels, open on their own as a covering sheath is pulled back. Once placement is confirmed, the balloon, catheter, and wire are removed, and the puncture is closed, often with a vascular closure device. Patients are typically monitored for several hours afterward for bleeding, reactions to the contrast dye, or problems with the stent.

Each of these steps, from how easily the device tracks through the vessels to how evenly it expands, is something preclinical studies evaluate before a new stent reaches patients.

Clinical Benefits of Stent Placement

Stents offer significant benefits for patients with vascular disease, including:

Restoration of blood flow to reduce pain, shortness of breath, or limb ischemia
Prevention of heart attack in coronary artery disease
Reduced need for open surgery due to minimally invasive deployment
Lower restenosis rates with drug-eluting or next-generation platforms
Improved quality of life through sustained vascular patency
Rapid recovery compared to traditional surgical interventions

For many patients, stent placement is a life-saving procedure with long-term protective benefits.

Risks and Potential Complications

Although stents are widely used and generally safe, complications can occur. Understanding these risks helps guide clinical decision-making and device design.

Potential risks include:

Restenosis: Excess tissue growth causing vessel re-narrowing
Thrombosis: Clot formation within the stent, particularly in early healing phases
Stent migration or malposition: More common in peripheral vessels
Allergic or inflammatory response to metals or polymers
Mechanical failure: Fatigue, fracture, or loss of structural integrity

Risk varies based on patient factors, lesion type, device design, and procedural technique.

Importance of Preclinical Testing for Stent Safety

Preclinical evaluation is critical to ensure stent reliability before clinical use. Testing helps determine how well a stent performs under physiological conditions.

Key preclinical assessments include:

Radial strength and expansion testing
Fatigue, bending, and torsion testing
Drug-release kinetics for DES platforms
Biocompatibility and ISO 10993 testing
In vivo assessment of vessel interaction, healing, and endothelialization
Imaging evaluation using fluoroscopy, CT, or ultrasound

These studies support FDA submissions and help identify design improvements early in development.

Advancing Vascular Innovation With IBEX

IBEX provides advanced preclinical vascular models and specialized imaging capabilities to support the development of coronary, peripheral, and novel stent technologies. Our expert surgical teams ensure accurate deployment, comprehensive data collection, and realistic anatomical evaluation.

From early feasibility to full-scale preclinical studies, IBEX delivers high-quality data to support regulatory submissions and accelerate innovation.