An Anisotropic and Stable-Conductance Patch for Mechanical-Electrical Coupling With Infarcted Myocardium

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Regenerative Medicine

Background:

• Polymeric conductive patches aid myocardial repair by improving electrical conduction and mechanical support.
• Restoring electrical conduction and cardiac function with stable, anisotropic cues in vivo remains challenging.

Purpose of the Study:

• To develop a novel anisotropic conductive patch for infarcted myocardium repair.
• To mimic the hierarchical structure of myocardial fibers for enhanced biocompatibility and function.

Main Methods:

• A weaving-based processing method was used to create a striated polypyrrole conductive coating on oriented elastic fiber bundles.
• The patch's mechanical and electrical properties were precisely controlled using woven molding.
• In vivo efficacy was tested using a rat myocardial infarction (MI) model.

Main Results:

• The patch demonstrated exceptional stretchability (>400% elongation), stable conductance (ΔR/R0 = 0.04 within 20% strain), and fatigue resistance.
• Anisotropic mechanical-electrical coupling with infarcted myocardium was achieved, improving cardiac function and electrical activity long-term.
• The patch inhibited myocardial inflammation and fibrosis while promoting angiogenesis.

Conclusions:

• The developed anisotropic conductive patch shows promise for treating myocardial infarction.
• Woven technology offers a viable approach for processing biomaterials with both rigid and elastic components for biomedical applications.