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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
Summary
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.
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.
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