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Zhu L, Yu Q, Yu L, Wang L, Yang Y, Shen P, Fan Y. Optimizing the design of axial flow pump blades based on fluid characteristics. Comput Methods Biomech Biomed Engin 2024:1-10. [PMID: 38444287 DOI: 10.1080/10255842.2024.2318011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/15/2023] [Indexed: 03/07/2024]
Abstract
Non-physiological blood flow conditions in axial blood pumps lead to some complications, including hemolysis, platelet activation, thrombosis, and embolism. The high speed of the axial blood pump destroys large amounts of erythrocytes, thereby causing hemolysis and thrombosis. Thus, this study aims to reduce the vortices and reflux in the flow field by optimizing the axial blood pump. The axial blood pump and arterial flow field were modeled by the finite element method. The blood was assumed to be incompressible, turbulent, and Newtonian. The SST k-ω turbulence model was used. The frozen rotor method was also used to calculate the snapshot of motion. Many vortices and reflux exist in the flow field of the blood pump without optimization. The improved flow field had almost no vortex and reflux, thereby reducing the exposure time of blood. The optimized blood pump had little influence on the pressure field and shear stress field. The optimized blood pump mainly reduced the vortex, reflux, and the risk of thrombosis in the flow field. The flow field characteristics of an axial blood pump were studied, and the results showed the risk of thrombosis and hemolysis in the blood pump. In accordance with the relationship between the blade shape and the flow field, the blade of the blood pump was optimized, reducing the vortex and reflux of the flow field, as well as the risk of thrombosis.
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Affiliation(s)
- Lin Zhu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Qifeng Yu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- Shanghai NewMed Medical Co., Ltd, Shanghai, China
| | - Lu Yu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Lizhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yuncong Yang
- Shanghai NewMed Medical Co., Ltd, Shanghai, China
| | - Peng Shen
- Shanghai NewMed Medical Co., Ltd, Shanghai, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- School of Biological Science and Medical Engineering, Beihang University, Beijing, China
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Adji A, Shehab S, Jain P, Robson D, Jansz P, Hayward CS. Arterial Compliance and Continuous-Flow Left Ventricular Assist Device Pump Function. ASAIO J 2022; 68:925-931. [PMID: 35544445 DOI: 10.1097/mat.0000000000001768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Durable continuous-flow left ventricular assist devices (cfLVADs) demonstrate superior survival, cardiac functional status, and overall quality of life compared to medical therapy alone in advanced heart failure. Previous studies have not considered the impact arterial compliance may have on pump performance or developed arterial pressure. This study assessed the impact of alterations in arterial compliance, preload, and afterload on continuous-flow pump function and measured hemodynamics using an in-vitro pulsatile mock circulatory loop. Decreased arterial compliance was associated with a significant increase in arterial pressure pulsatility which was not evident in the flow pulsatility, as displayed in pump flow waveforms. There were marked changes in the pump flow waveforms due to the significant alteration in the aortoventricular gradient during diastole according to the changes in compliance. This study demonstrates that changes in systemic blood pressure, afterload, and left ventricular contractility each significantly affects the flow waveform. The association of hypertension with lower aortic compliance results in markedly decreased diastolic flow rates which may be important in contributing to a greater risk of adverse events under cfLVAD support.
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Affiliation(s)
- Audrey Adji
- From the Heart Failure and Transplant Unit, Cardiology Department, St Vincent's Hospital, Sydney, Australia
- Mechanical Circulatory Support Laboratory, Victor Chang Cardiac Research Institute, Sydney, Australia
- St Vincent's Clinical School, UNSW Medicine and Health, Sydney, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, Australia
| | - Sajad Shehab
- Mechanical Circulatory Support Laboratory, Victor Chang Cardiac Research Institute, Sydney, Australia
| | - Pankaj Jain
- From the Heart Failure and Transplant Unit, Cardiology Department, St Vincent's Hospital, Sydney, Australia
| | - Desiree Robson
- From the Heart Failure and Transplant Unit, Cardiology Department, St Vincent's Hospital, Sydney, Australia
| | - Paul Jansz
- From the Heart Failure and Transplant Unit, Cardiology Department, St Vincent's Hospital, Sydney, Australia
- Mechanical Circulatory Support Laboratory, Victor Chang Cardiac Research Institute, Sydney, Australia
- St Vincent's Clinical School, UNSW Medicine and Health, Sydney, Australia
- School of Medicine, University of Notre Dame, Sydney, Australia
| | - Christopher S Hayward
- From the Heart Failure and Transplant Unit, Cardiology Department, St Vincent's Hospital, Sydney, Australia
- Mechanical Circulatory Support Laboratory, Victor Chang Cardiac Research Institute, Sydney, Australia
- St Vincent's Clinical School, UNSW Medicine and Health, Sydney, Australia
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