Fiber-reinforced zwitterionic elastomer composites for artificial heart valves

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Polymer Chemistry

Background:

• Valvular heart disease (VHD) poses significant health risks, driving the need for improved prosthetic solutions.
• Current polymeric heart valves (PHVs) face challenges including thrombosis, calcification, and inflammation.
• Existing antifouling coatings for PHVs often lack stability and mechanical compatibility.

Purpose of the Study:

• To develop a novel fiber-reinforced zwitterionic elastomer composite for advanced polymeric heart valves.
• To achieve both effective antifouling properties and enhanced mechanical robustness in PHVs.
• To create a biomaterial that mimics natural heart valve structure and function.

Main Methods:

• Fabrication of a zwitterionic elastomer composite with in situ surface generation.
• Incorporation of orthogonally aligned electrospun fibers for mechanical reinforcement.
• Assessment of anticoagulant, antifouling, mechanical integrity, and in vivo biocompatibility.

Main Results:

• The composite demonstrated excellent anticoagulant and antifouling characteristics.
• Anisotropic mechanical properties were achieved, mimicking natural valve leaflets.
• The material maintained integrity over 60 days of serum immersion and 100 million fatigue cycles.
• In vivo studies showed significant anti-inflammatory and anti-calcification effects.

Conclusions:

• The developed fiber-reinforced zwitterionic elastomer composite represents a promising advancement for polymeric heart valves.
• This material addresses key limitations of current PHVs, offering improved biocompatibility and durability.
• The findings suggest potential for reduced VHD-related morbidity and mortality through enhanced prosthetic valve performance.