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Multi-functional adhesive hydrogel as bio-interface for wireless transient pacemaker.

Qiang Zhang1, Guangyao Zhao1, Zhiyuan Li1

  • 1Department of Biomedical Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong, China.

Biosensors & Bioelectronics
|July 26, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel interface hydrogel to improve wireless, bioresorbable transient pacemakers. This new material enhances tissue-device bonding, electrical performance, and infection resistance for safer cardiac pacing.

Keywords:
Bioelectrical-tissue interfaceCardiac rhythmElectrical stimulationMultifunctional hydrogelTemporary cardiac pacemaker

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Area of Science:

  • Biomaterials Science
  • Biomedical Engineering
  • Cardiology

Background:

  • Traditional temporary cardiac pacemakers (TCPs) have limitations including rigidity, battery dependence, and the need for surgical retrieval, leading to complications.
  • Existing wireless and bioresorbable transient pacemakers face challenges with tissue-device interface, including poor adhesion, mismatched mechanical properties, and infection risks.

Purpose of the Study:

  • To develop a multifunctional interface hydrogel (MIH) to overcome the limitations of current transient pacemakers.
  • To improve the electrical performance, mechanical compatibility, adhesion, and antibacterial properties of the tissue-device interface.

Main Methods:

  • A novel multifunctional interface hydrogel (MIH) was synthesized and characterized.
  • The MIH was integrated with a leadless, battery-free, wireless transient pacemaker.
  • The mechanical properties, adhesion strength, electrical performance, and bactericidal effects of the MIH were evaluated.
  • The performance of the integrated pacemaker system on beating heart tissue was assessed.

Main Results:

  • The developed MIH demonstrated superior electrical performance for efficient energy exchange.
  • The hydrogel exhibited mechanical strength comparable to natural heart tissue (tensile strength: ~30 kPa, shear strength: ~30 kPa).
  • Robust adhesion properties were achieved (peel-off strength: ~85 kPa), ensuring stable device-tissue fixation.
  • The MIH showed a significant bactericidal effect, suppressing bacterial growth and reducing infection risks.

Conclusions:

  • The multifunctional interface hydrogel effectively addresses key limitations in transient pacemaker technology.
  • The integrated wireless transient pacemaker system shows stable, conformal adhesion and precise cardiac stimulation.
  • This innovation holds significant potential for next-generation implantable medical devices and bioelectronic-tissue interfaces.