Hybrid textile heart valve prosthesis: preliminary in vitro evaluation

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Textile Engineering

Background:

• Transcatheter aortic valve implantation (TAVI) commonly uses biological tissues, but concerns exist regarding material degradation and long-term durability.
• The limitations of biological tissues drive the development of synthetic alternatives for TAVI devices.
• Textile polyester (PET) offers good folding and strength, but elasticity is needed to mitigate hemodynamic issues.

Purpose of the Study:

• To investigate the in vitro mechanical and hydrodynamic performance of a novel hybrid elastic textile valve for TAVI.
• To compare the properties of a hybrid valve (PET and polyurethane yarns) with a non-elastic textile valve.

Main Methods:

• Fabrication of a hybrid elastic textile valve incorporating non-deformable PET and elastic polyurethane (PU) yarns.
• In vitro mechanical testing to evaluate material properties and fatigue resistance.
• In vitro hydrodynamic testing to assess valve performance during simulated blood flow.

Main Results:

• The hybrid elastic textile valve demonstrated enhanced hydrodynamic properties compared to the non-elastic valve.
• Under fatigue testing, the interaction between PU and PET yarns negatively impacted the overall durability of the hybrid valve.
• The elastic component showed potential for improving valve function but introduced challenges for long-term material integrity.

Conclusions:

• Hybrid elastic textile valves show promise for improved hydrodynamic function in TAVI applications.
• Further material engineering is required to overcome durability limitations caused by yarn interactions under fatigue.
• The study highlights the trade-offs between elasticity, hydrodynamic performance, and long-term durability in synthetic TAVI valve development.