Optimized biomechanical design of a tissue engineered pulsatile Fontan conduit

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Pediatric Cardiology

Background:

• Congenital heart defects (CHDs) survivors face lifelong challenges due to non-physiological Fontan circulation.
• Current surgical palliation for CHDs leads to significant sequelae and reduced lifespan.
• Restoring subpulmonic pumping function is a critical unmet need in pediatric cardiac surgery.

Purpose of the Study:

• To develop an analytically based framework for designing pulsatile conduits using biomechanical principles.
• To optimize conduit performance for pediatric anatomical constraints.
• To demonstrate the clinical potential of a novel pulsatile conduit design.

Main Methods:

• Coupling passive matrix architecture and properties with embedded myofibers.
• Parametric exploration of matrix properties and myofiber orientations.
• Utilizing patient-specific hemodynamic models for performance evaluation.

Main Results:

• Biomechanically feasible pulsatile conduit designs were identified.
• Sensitivity analyses confirmed design robustness and identified critical parameters for biomanufacturing and surgery.
• An optimized pulsatile conduit demonstrated the potential to generate physiologically meaningful pressures and flows, outperforming passive grafts.

Conclusions:

• The developed framework provides a rigorous biomechanical basis for designing functional pulsatile conduits.
• This approach holds promise for improving outcomes in pediatric patients with CHDs.
• Optimized pulsatile conduits represent a significant advancement over current passive grafts for Fontan circulation.