Dynamic characteristic modeling of left ventricular assist devices based on hysteresis effects

• Published in: Computers in biology and medicine 2023-05, Vol.157, p.106737-106737, Article 106737
• Main Authors: Li, Shulei, Jin, Donghai, Gui, Xingmin
• Format: Article
• Language: English
• Subjects: Axial flow pumps; Benchmarks; Cardiovascular system; Centrifugal pumps; Computational fluid dynamics; Computer applications; Computer Simulation; Design; Dynamic characteristic modeling; Dynamic characteristics; Flow control; Fluid dynamics; Heart; Heart-Assist Devices; Hydrodynamics; Hysteresis; Hysteresis effect; Hysteresis models; Inertia; Left ventricular assist device; Mathematical models; Methods; Models, Cardiovascular; Preliminary designs; Prototypes; Simulation; Turbomachinery; Unsteady characteristic loop; Velocity; Ventricle; Ventricular assist devices
• ISSN: 0010-4825; 1879-0534
• DOI: 10.1016/j.compbiomed.2023.106737

The purpose of this study is to develop a new model for the dynamic characteristics of left ventricular assist devices (LVADs) interacting with the cardiovascular system under constant-speed modes. A new hysteresis model is established on the basis of the hysteresis effect and turbomachinery principles. The simulation results from the hysteresis model were compared with the inertia model. The in-vitro experiment results of a centrifugal pump (from literature) and the unsteady computational fluid dynamics (CFD) simulation results of an axial pump were used as the benchmarks. Compared with the inertia model, at the partial support mode, the relative estimation error of the time to the maximum and minimum pump flow (Q) in the hysteresis model decreased at least 16.3% cardiac cycle (Tc) in the centrifugal pump and at least 1.9% Tc in the axial pump, indicating its ability to simulate more realistic Q fluctuations. Moreover, the hysteresis model could predict an accurate time distribution of different Q. The hysteresis model provides a general calculation method for simulating the dynamic characteristics of constant-speed LVADs under interaction with the cardiovascular system. It is more accurate than the inertia model. The hysteresis model is helpful for the rapid estimation of unsteady dynamic characteristics in absence of a physical pump prototype at the preliminary design stage. •Developed a new dynamic characteristic model of LVADs interacting with the cardiovascular system.•Provided a general calculation method of constant-speed LVADs based on hysteresis effect and turbomachinery principles.•Simulated pump flow fluctuations are in good accordance with in-vitro and unsteady CFD results.•Helpful for the rapid estimation of unsteady dynamic characteristics at the preliminary design stage.