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Related Experiment Video

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A Tissue-Compliant Shape-Memory Composite Membrane for Cardiac Occluders.

Yuqi Li1,2, Yafeng Zou2, Xinyi Yang2

  • 1Hangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China.

Bioengineering (Basel, Switzerland)
|May 4, 2026
PubMed
Summary

This study introduces a new composite membrane for ventricular septal defect (VSD) occluders, using a poly(vinyl alcohol) grid within a poly(glycerol dodecanedioate) matrix to improve mechanical properties and reduce complications.

Keywords:
polymer-based occludershape-memory polymerventricular septal defect

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Area of Science:

  • Biomaterials Science
  • Medical Device Engineering
  • Polymer Chemistry

Background:

  • Current ventricular septal defect (VSD) occluders use nitinol frameworks, leading to mechanical mismatch and potential long-term complications.
  • There is a need for improved occluder materials that offer better tissue compliance and biocompatibility.

Purpose of the Study:

  • To develop and evaluate a novel tissue-compliant composite membrane for VSD occluders.
  • To investigate the mechanical properties, biocompatibility, and degradation of a poly(vinyl alcohol) (PVA) reinforced poly(glycerol dodecanedioate) (PGD) composite.

Main Methods:

  • Fabrication of a composite membrane by embedding a 3D-printed PVA grid within a PGD matrix, with varied grid spacing.
  • Characterization using FTIR, mechanical testing (tensile modulus, fracture strength), swelling studies, finite-element analysis, and benchtop occlusion testing.
  • In vitro biocompatibility assays (cytotoxicity, hemolysis) and a 12-week pilot degradation study in PBS.

Main Results:

  • The PGD-PVA composite demonstrated enhanced tensile modulus and fracture strength compared to PGD alone, with PVA incorporation via physical interlocking.
  • Finite-element analysis and occlusion testing showed reduced deformation and strain localization in the PGD-PVA composite.
  • In vitro assays confirmed low cytotoxicity and hemolysis, and the composite showed acceptable degradation over 12 weeks with an encapsulated design.

Conclusions:

  • The reinforced PGD-PVA composite membrane offers improved mechanical properties and biocompatibility for potential use in polymeric occluders.
  • This strategy addresses limitations of current nitinol-based occluders, paving the way for safer and more effective VSD treatment.
  • Further studies are warranted to validate the long-term performance and clinical efficacy of these novel occluders.