A Uni-Directional Biodegradable Stent for Systematic Modulation in Biliary Diseases

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Engineering

Background:

• Metal stents pose risks like secondary removal and limited adjustability for biliary diseases.
• Current treatments necessitate controllable, degradable, and adjustable stent solutions for precise clinical application.

Purpose of the Study:

• To develop a high-performance biodegradable stent using a uni-material and uni-process strategy.
• To systematically address the demands of multiple biliary diseases with an adjustable stent.
• To precisely regulate the degradation behavior of poly-L-lactic acid (PLLA) stents.

Main Methods:

• Utilized high modulus, high orientation poly-L-lactic acid (PLLA) monofilament.
• Employed electron beam sterilization (EBS) technology to adjust degradation behavior.
• Conducted in vitro experiments in bile and Phosphate-buffered saline (PBS) environments.

Main Results:

• Tailored degradation cycles of PLLA stents by regulating molecular weight through varying EBS doses.
• Established a controlled relationship between material degradation in bile and PBS.
• Demonstrated the potential for precise control over stent degradation for specific clinical needs.

Conclusions:

• The developed PLLA stent offers adjustable degradation profiles for diverse biliary disease treatments.
• Electron beam sterilization provides a precise method for tuning stent performance.
• This research lays a foundation for advanced biodegradable biliary stents.