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Biodegradable stents with elastic memory.
Subbu S Venkatraman1, Lay Poh Tan, Joe Ferry D Joso
1School of Materials Engineering, Nanyang Technological University, N4.1-1-30 Nanyang Avenue, Singapore 639798, Singapore. assubbu@ntu.edu.sg
Biomaterials
|September 27, 2005
Summary
Researchers developed a novel biodegradable stent that self-expands at body temperature using elastic memory. This innovation addresses challenges with fully polymeric stents, offering a promising advancement in medical devices.
Area of Science:
- Biomaterials Science
- Polymer Engineering
- Medical Device Development
Background:
- Fully biodegradable polymeric stents face challenges with elastic recoil after balloon expansion.
- Self-expansion at body temperature is crucial for effective deployment of polymeric stents.
Purpose of the Study:
- To develop a fully biodegradable polymeric stent with self-expansion capabilities at body temperature (37°C).
- To investigate the role of elastic memory in achieving stent self-expansion.
- To analyze the impact of layer thickness and composition on stent performance.
Main Methods:
- Fabrication of bi-layered biodegradable stent prototypes using poly-L-lactic acid (PLLA) and poly glycolic acid (PLGA).
- Imparting elastic memory through temperature conditioning.
- Evaluating self-expansion rates at 37°C and stent collapse strengths.
Main Results:
- Successful development of a biodegradable stent exhibiting self-expansion at 37°C.
- Demonstrated that stent layer thickness and composition critically influence self-expansion rate and collapse strength.
- Identified a maximum self-expansion rate correlated with specific layer thicknesses.
- Noted that the glass transition temperature (Tg) of the outer layer significantly affects expansion.
Conclusions:
- The developed bi-layered biodegradable stent effectively utilizes elastic memory for self-expansion at body temperature.
- Optimizing layer thickness and considering the Tg of the outer layer are key for enhancing stent performance.
- This technology presents a significant advancement for biodegradable stent applications.