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Related Experiment Video

Updated: May 1, 2026

Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release
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Magnetoactive elastomer-based dynamic urethral support device for stress urinary incontinence.

Seelay Tasmim1, Asha Baten1, Manivannan Sivaperuman Kalairaj1

  • 1Texas A&M University, Department of Biomedical Engineering, College Station, TX, United States.

Acta Biomaterialia
|November 24, 2024
PubMed
Summary

A novel magnetoactive elastomer sling dynamically adjusts urethral support to treat stress urinary incontinence (SUI). This externally controlled device offers a promising, less invasive alternative to traditional SUI treatments.

Keywords:
Magnetoactive elastomersMedical devicesShapechanging polymersStress urinary incontinence

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Area of Science:

  • Biomaterials Science
  • Urology
  • Medical Devices

Background:

  • Stress urinary incontinence (SUI) affects many adult women, with current sling treatments lacking adjustability.
  • Existing adjustable devices often involve invasive surgery or complex components.

Purpose of the Study:

  • To design and evaluate a soft magnetoactive elastomer (MAE) device for adjustable urethral support in SUI treatment.
  • To assess the MAE device's shape-changing capabilities and performance in a simulated lower urinary tract model.

Main Methods:

  • MAE devices were embedded in agar gels of varying stiffness to test shape change under magnetic fields (up to 200 mT).
  • An in vitro lower urinary tract model was used to measure flow time and bladder pressure before and after MAE sling activation.
  • Device stability was assessed under accelerated oxidative and hydrolytic conditions.

Main Results:

  • MAE devices in 100 kPa agar gel showed a 4.7% ± 1.1% change in height.
  • Silica-coated MAE devices exhibited minimal mass loss (2.36% ± 1.55% oxidative, 0.58% ± 0.25% hydrolytic).
  • The MAE sling significantly reduced normalized flow time from 1.56 ± 0.18 to 1.11 ± 0.16 at 60 cm-H2O, demonstrating adjustable urethral support.

Conclusions:

  • A dynamic, magnetically controlled MAE sling can modulate urethral support in a lower urinary tract model.
  • This proof-of-concept device offers a less invasive, adjustable treatment for SUI, potentially preventing complications and improving patient quality of life.