Bioresorbable stent

A bioresorbable stent implanted in a blood vessel

Pronunciation
Other names	Bioabsorbable stent, biodegradable stent
Medical specialty	Cardiology, Vascular surgery
Uses
Complications
Approach
Types
Recovery time
Other options
Frequency

A bioresorbable stent, also known as a bioresorbable vascular scaffold (BVS), is a type of stent used in interventional cardiology to treat narrowed or blocked coronary arteries. Unlike traditional metal stents, bioresorbable stents are designed to be absorbed by the body over time, leaving behind a natural vessel.

Design and Composition

Bioresorbable stents are typically made from materials such as polylactic acid (PLA) or poly-L-lactic acid (PLLA), which are biodegradable polymers. These materials are chosen for their ability to provide temporary support to the artery while gradually dissolving into naturally occurring substances in the body, such as carbon dioxide and water.

Mechanism of Action

The primary function of a bioresorbable stent is to provide mechanical support to a narrowed artery, allowing it to remain open and restore adequate blood flow. Over time, as the artery heals and remodels, the stent is absorbed by the body, reducing the risk of long-term complications associated with permanent stents, such as stent thrombosis and in-stent restenosis.

Advantages

Bioresorbable stents offer several potential advantages over traditional stents:

• Reduced Long-term Complications: By being absorbed, they eliminate the risk of late stent thrombosis and reduce the incidence of restenosis.
• Restoration of Natural Vessel Function: Once absorbed, the vessel can regain its natural vasomotion and flexibility.
• Improved Imaging: The absence of a permanent metallic structure allows for better imaging with non-invasive imaging techniques such as MRI.

Challenges and Limitations

Despite their advantages, bioresorbable stents face several challenges:

• Thicker Struts: To provide adequate support, bioresorbable stents often have thicker struts compared to metallic stents, which can affect deliverability and increase the risk of early thrombosis.
• Longer Absorption Time: The complete absorption process can take several years, during which time the risk of complications remains.
• Limited Data: Long-term data on the safety and efficacy of bioresorbable stents is still being collected, and their use is not yet as widespread as traditional stents.

Current Use and Research

Bioresorbable stents are currently used in select patients and are the subject of ongoing research to improve their design and performance. Studies are focused on optimizing the materials used, reducing strut thickness, and enhancing the drug-eluting capabilities of these stents to improve outcomes.

Related pages

• Stent
• Coronary artery disease
• Interventional cardiology
• Polylactic acid