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Computational design and analysis of biocompatible shape memory polymer-based self-expandable stent

  • Avadesh Yadav ORCID logo EMAIL logo , Akanksha Singh and Satish Kumar ORCID logo
Published/Copyright: January 1, 2026
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Journal of Polymer Engineering
From the journal Journal of Polymer Engineering Volume 46 Issue 3

Abstract

Cardiovascular stents restore lumen patency, yet balloon-expandable designs may expand non-uniformly and traumatize vessels. A self-expandable, biodegradable stent is designed and computationally evaluated from shape-memory polymers (SMPs): poly(L-Lactic acid) (PLLA) and poly(lactic-co-glycolic acid) (PLGA). A hexagonal-nested lattice (Ø4 mm, length 40 mm, thickness 0.4 mm; rib width 0.5 mm; rib angle 120.39°; connector length 1 mm) was modeled in SOLIDWORKS and analyzed by finite elements. Physiological internal pressure (150 mmHg ≈ 0.02 MPa) assessed radial response and foreshortening across circumferential cell counts of 5, 6, and 7. Thermo-mechanical deployment followed the SMP sequence, heat to Tg, cool, crimp, holding time, reheat (Tg-PLLA ≈ 64 °C), to evaluate shape fixity and recovery. Reducing cells from 7 to 5 lowered peak von Mises stress (PLLA: ∼1.33 MPa–0.89 MPa), so the five-cell design was chosen for deployment. PLLA achieved high shape fixity (95 %) and near-complete recovery (>99 %) with negligible expansion stresses (10−6 MPa), indicating controlled self-deployment. PLGA showed inferior shape-memory metrics and was not advanced to detailed stress comparison. SMP-based biodegradable stents can combine low deployment stress with adequate radial support, and the presented workflow provides a reproducible computational basis for subsequent prototyping and in vitro validation.

Keywords: stent; self-expandable; design; biocompatible; deployment
Corresponding author: Avadesh Yadav, Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, 211004, Uttar Pradesh, India, E-mail:
A. Yadav et al.: Computational design of SMP-based self-expandable stent.

Acknowledgment

Special thanks to the MNNIT Allahabad, Prayagraj, for providing the required computational facility. The first author sincerely recognises MHRD India for providing financial (PhD Fellowship) support.

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The authors state no conflict of interest.

  6. Research funding: None declared.

  7. Data availability: The data that support the findings of this study are available from the corresponding author, AY, upon reasonable request.

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Supplementary Material

This article contains supplementary material (https://doi.org/10.1515/polyeng-2025-0134).

Received: 2025-08-18
Accepted: 2025-11-18
Published Online: 2026-01-01
Published in Print: 2026-03-26

© 2025 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Preparation and Assembly
  3. Recent progress in flexible sensor research in recent five years
  4. Manufacturing and characterization of natural zeolite-filled TPU composites: influence of loading ratio and calcination of zeolite
  5. Fabrication and characterization of high-performance heat-resistant acrylonitrile–butadiene–styrene (ABS) composites reinforced with carbon fibers
  6. Preparation and performance evaluation of dextrin-modified slow-release hydration heat inhibitor
  7. Post-treatment of polysulfone/zeolite-templated carbon mixed matrix membranes by heating and surface coating for enhanced gas separation performance
  8. Engineering and Processing
  9. Computational design and analysis of biocompatible shape memory polymer-based self-expandable stent
  10. Utilizing electrospun cellulose adsorption nanofilters derived from mangrove roots and polyacrylonitrile for desalination
https://doi.org/10.1515/polyeng-2025-0134
Keywords for this article
stent; self-expandable; design; biocompatible; deployment

Articles in the same Issue

  1. Frontmatter
  2. Preparation and Assembly
  3. Recent progress in flexible sensor research in recent five years
  4. Manufacturing and characterization of natural zeolite-filled TPU composites: influence of loading ratio and calcination of zeolite
  5. Fabrication and characterization of high-performance heat-resistant acrylonitrile–butadiene–styrene (ABS) composites reinforced with carbon fibers
  6. Preparation and performance evaluation of dextrin-modified slow-release hydration heat inhibitor
  7. Post-treatment of polysulfone/zeolite-templated carbon mixed matrix membranes by heating and surface coating for enhanced gas separation performance
  8. Engineering and Processing
  9. Computational design and analysis of biocompatible shape memory polymer-based self-expandable stent
  10. Utilizing electrospun cellulose adsorption nanofilters derived from mangrove roots and polyacrylonitrile for desalination
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