Computational modelling of flow and tip variations of aortic cannulae in cardiopulmonary bypass procedure

2nd International Conference on Computational Fluid Dynamics in Research and Industry

力学;计算机科学;工业技术

Thomas, Siti A^1 ; Empaling, Shirly^1 ; Darlis, Nofrizalidris^2 ; Osman, Kahar^3,4 ; Dillon, Jeswant^5 ; Taib, Ishkrizat^6 ; Md Khudzari, Ahmad Zahran^1,4

Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, Johor

81310, Malaysia^1

Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor

86400, Malaysia^2

Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, Johor

81310, Malaysia^3

IJN-UTM Cardiovascular Engineering Centre, Institute of Human Centered Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, Johor

81310, Malaysia^4

Institut Jantung Negara, Jalan Tun Razak, Kuala Lumpur

50400, Malaysia^5

Flow Analysis Simulation and Turbulence Research Group, Faculty of Mechanical and Manufacturing, Universiti Tun Hussein Onn, Parit Raja, Johor

86400, Malaysia^6

关键词: Cardiopulmonary bypass;    Cardiovascular function;    Computational modelling;    Maximum velocity;    Open-heart surgery;    Outflow velocities;    Patient condition;    Wall shear stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/243/1/012021/pdf
DOI  :  10.1088/1757-899X/243/1/012021

来源: IOP

【 摘 要 】

Aortic cannulation has been the gold standard for maintaining cardiovascular function during open heart surgery while being connected onto the heart lung machine. These cannulation produces high velocity outflow which may lead to adverse effect on patient condition, especially sandblasting effect on aorta wall and blood cells damage. This paper reports a novel design that was able to decrease high velocity outflow. There were three design factors of that was investigated. The design factors consist of the cannula type, the flow rate, and the cannula tip design which result in 12 variations. The cannulae type used were the spiral flow inducing cannula and the standard cannula. The flow rates are varied from three to five litres per minute (lpm). Parameters for each cannula variation included maximum velocity within the aorta, pressure drop, wall shear stress (WSS) area exceeding 15 Pa, and impinging velocity on the aorta wall were evaluated. Based on the result, spiral flow inducing cannulae is proposed as a better alternatives due to its ability to reduce outflow velocity. Meanwhile, the pressure drop of all variations are less than the limit of 100 mmHg, although standard cannulae yielded better result. All cannulae show low reading of wall shear stress which decrease the possibilities for atherogenesis formation. In conclusion, as far as velocity is concerned, spiral flow is better compared to standard flow across all cannulae variations.