The Progress in the Novel Pediatric Rotary Blood Pump Sputnik Development

Area of Science:

• Biomedical Engineering
• Cardiovascular Devices
• Fluid Dynamics

Background:

• Pediatric heart failure necessitates advanced circulatory support.
• Implantable rotary blood pumps (RPBs) offer a potential solution for pediatric patients.
• Understanding pump hemodynamics is crucial for minimizing adverse effects like thrombosis and hemolysis.

Purpose of the Study:

• To design, prototype, and evaluate the Sputnik pediatric rotary blood pump (PRBP).
• To investigate the fluid dynamics, including backflow and stagnation regions, at various operating points.
• To assess the interaction of the PRBP with a mock circulatory system simulating cardiovascular physiology.

Main Methods:

• Numerical simulations (Computational Fluid Dynamics) were used to model the PRBP's 3D geometry and analyze flow patterns.
• Head pressure-flow rate (H-Q) curves were calculated at different rotor speeds (10,000–14,000 rpm).
• A mock circulatory system (MCS) was employed to simulate cardiovascular conditions and test PRBP-cardiovascular interactions.

Main Results:

• The Sputnik PRBP demonstrated minimal backflow and stagnation at flow rates of 3–5 L/min and 75–80 mm Hg.
• Shear stress levels remained below the critical threshold of 150 Pa, indicating a low risk of blood cell damage.
• The PRBP achieved full left ventricular support at 10,000 rpm and induced a suction state at 14,000 rpm.

Conclusions:

• The Sputnik PRBP is a promising device for pediatric patients (BSA > 0.6 m², weight > 12 kg).
• Operating the pump between 3–5 L/min is judicious, ensuring efficient flow and minimizing adverse hemodynamic regions.
• The study validates the PRBP's potential for improving clinical outcomes in pediatric mechanical circulatory support.