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Blood Flow

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.

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Mechanically-foldable axial flow blood pump: response-surface-based structural optimization and hemolytic performance

Tairan Ji¹, Teng Jing¹, Jianan Cheng¹

¹National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu, China.

Frontiers in Physiology

|January 5, 2026

Summary

This summary is machine-generated.

This study introduces a foldable blood pump designed to reduce hemolysis by allowing lower rotational speeds. The optimized design improves head pressure by 6.9% and reduces hemolysis by 17.9%.

Keywords:

LVAD cage filament computational hemodynamics foldable blood pump parametricoptimization response surface methodology

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Area of Science:

Biomedical Engineering
Cardiovascular Devices
Fluid Dynamics

Background:

Traditional percutaneous ventricular assist devices (PVADs) require high rotational speeds, leading to significant hemolysis due to elevated shear stress.
Design limitations of existing PVADs necessitate improvements for enhanced clinical applicability and reduced blood trauma.

Purpose of the Study:

To design and optimize a foldable axial-flow blood pump with improved hydraulic efficiency and reduced hemolysis.
To systematically analyze the influence of structural parameters on pump performance and blood trauma using numerical simulations.

Main Methods:

Utilized numerical simulations and response surface methodology (RSM) with Box-Behnken Design (BBD) for parametric optimization.
Analyzed the impact of key parameters including impeller and diffuser angles, and impeller-diffuser gap on pump head and hemolysis index (HI).

Main Results:

Identified five critical structural parameters influencing pump head and HI.
Achieved a 6.9% increase in head pressure and a 17.9% reduction in HI compared to the initial design through optimization.
Demonstrated that increasing tip clearance reduces hemolysis with a moderate decrease in head.

Conclusions:

Developed and optimized a foldable axial-flow blood pump for transaortic implantation with enhanced performance.
The optimized pump configuration achieved a head of 2.346 m and an HI of $1.081 \times 1 0^{- 2} %$ .
Further adjustments in tip clearance can offer additional hemolysis reduction without significantly compromising pressure head, indicating potential for further clinical refinement.