A new design for polyurethane heart valves

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Medical Device Design

Background:

• Synthetic tri-leaflet heart valves show promise for improved hydrodynamic and biomechanical performance.
• Previous limitations in synthetic heart valves were due to polyurethane biostability issues.
• Advancements in biostable polyurethanes and design knowledge offer new clinical solutions.

Purpose of the Study:

• To describe the design, hydrodynamic, and biomechanical performance of a novel polyurethane heart valve.
• To compare the function and durability of this new design against porcine bioprosthetic and mechanical heart valves.

Main Methods:

• Design characteristics of a new polyurethane heart valve were detailed.
• Hydrodynamic and biomechanical performance was evaluated.
• Comparison with AorTech porcine bioprosthetic and Björk-Shiley Monostrut (BSM) mechanical valves was conducted.

Main Results:

• The polyurethane valve exhibited significantly lower pressure gradients than porcine and BSM valves at higher flow rates.
• It demonstrated a greater effective orifice area, reduced regurgitation, and lower total energy loss.
• The valve design achieved over 360 million cycles in durability testing without failure.

Conclusions:

• The novel polyurethane heart valve design offers superior hydrodynamic function compared to porcine bioprosthetic and BSM mechanical valves.
• Lower total energy loss suggests improved patient benefit.
• Demonstrated durability using medical-grade polyurethane highlights its clinical potential.