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Updated: Jun 11, 2025

Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release
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Novel temperature responsive polymer based sealant for embolization.

Ali E Dabiri1, Ravin Narain2, Yi-Yang Peng2

  • 13DTholdings, San Diego, CA, USA.

Science and Technology of Advanced Materials
|October 7, 2024
PubMed
Summary
This summary is machine-generated.

A novel hydrogel sealant offers improved catheter-based treatments with efficient delivery and no harmful byproducts. This tunable poly(N-isopropylacrylamide) (PNIPAM) material is safe, cost-effective, and suitable for lymphatic leakage embolization and left atrial appendage exclusion.

Keywords:
Glueatrial fibrillationinjectable hydrogellymphatic leakageself-healing hydrogel

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Medical Device Engineering

Background:

  • Current catheter-based treatments face limitations in delivery efficiency, in situ polymerization, byproduct safety, and cost.
  • There is a need for advanced sealant materials that are tunable, safe, and effective for various medical applications.

Purpose of the Study:

  • To develop and characterize a novel hydrogel sealant based on poly(N-isopropylacrylamide) (PNIPAM) with improved properties for catheter-based interventions.
  • To evaluate the material's suitability for specific applications such as lymphatic leakage embolization and left atrial appendage (LAA) exclusion.

Main Methods:

  • Utilized model-based development and material testing to optimize a thermo-responsive PNIPAM hydrogel.
  • Characterized the hydrogel for tunable transition temperature, radiopacity, mechanical properties for 3Fr catheter delivery, and cohesive strength.
  • Assessed the safety profile and potential for in situ polymerization and harmful byproducts.

Main Results:

  • Developed a hydrogel sealant with a customized transition temperature, suitable radiopacity, and appropriate mechanical properties for catheter delivery.
  • Demonstrated sufficient cohesion to resist migration under physiological pressures and an improved safety profile.
  • Identified potential applications in lymphatic leakage embolization and LAA exclusion to mitigate thromboembolic events.

Conclusions:

  • The developed PNIPAM-based hydrogel sealant offers significant improvements over existing technologies.
  • The material's tunable properties, safety, and efficacy make it a promising candidate for diverse healthcare applications beyond the studied examples.