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Related Experiment Video

Updated: Jun 14, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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Polycaprolactone-based shape memory foams as self-fitting vaginal stents.

Ashley J Hicks1, Courteney Roberts2, Andrew Robinson1

  • 1Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712, United States.

Acta Biomaterialia
|August 30, 2024
PubMed
Summary
This summary is machine-generated.

A novel self-fitting vaginal stent made from shape-memory polymer foam can prevent vaginal stenosis after pelvic treatments. This innovative stent compresses for insertion and expands to fit patients, improving quality of life.

Keywords:
Emulsion templatingShape memory polymersVaginal stenosis

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Gynecological Devices

Background:

  • Vaginal stenosis is a debilitating complication following pelvic radiation therapy and reconstructive surgery.
  • Existing treatments for vaginal stenosis are often invasive and lack patient-centered design.
  • There is a critical need for effective, patient-friendly solutions to prevent vaginal stenosis.

Purpose of the Study:

  • To develop and evaluate a self-fitting vaginal stent using shape-memory polymer (SMP) foam.
  • To engineer a stent capable of compressed insertion and subsequent expansion to conform to individual patient anatomy.
  • To address the clinical need for preventing vaginal stenosis post-pelvic treatments.

Main Methods:

  • Fabrication of high-porosity SMP foams using photocurable polycaprolactone (PCL) macromers (star-PCL-tetraacrylate and linear-PCL-diacrylate).
  • Investigation of foam architecture and macromer type to optimize shape fixity and shape recovery at physiological temperatures.
  • Development of a custom mold and curing system for stent fabrication, followed by crimping and deployment testing in a benchtop pelvic model.

Main Results:

  • Star-PCL-tetraacrylate foams exhibited reduced melting temperature and demonstrated significant shape recovery (∼84%) at 37 °C.
  • Fabricated stents showed excellent shape fixity (>95%) in a crimped state and near-complete shape recovery (∼100%).
  • The SMP vaginal stent rapidly expanded within 5 minutes in a simulated pelvic model and maintained vaginal caliber under physiological pressures with <10% decrease.

Conclusions:

  • Shape-memory polymer foams offer a promising platform for developing self-fitting vaginal stents to prevent stenosis.
  • The developed stent design and open-source tools facilitate iterative design for gynecological devices.
  • This patient-forward approach has the potential to significantly improve outcomes and quality of life for patients undergoing pelvic treatments.