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Poletti G, Ninarello D, Pennati G. Computational Analysis of the Effects of Fiber Deformation on the Microstructure and Permeability of Blood Oxygenator Bundles. Ann Biomed Eng 2024; 52:1091-1105. [PMID: 38349442 PMCID: PMC10940480 DOI: 10.1007/s10439-024-03446-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 01/07/2024] [Indexed: 03/16/2024]
Abstract
Mechanical loads on the polymeric fibers of oxygenating bundles are commonly present due to bundle press-fitting during device assembly and blood pressure load. However, computational fluid dynamics (CFD) simulations for fiber bundle optimization neglect possible changes in microstructure due to such deformations. The aim of this study is to investigate the impact of fiber deformability on bundle microstructure and fluid dynamics mainly in terms of permeability. Fibers from commercial mats typically used for blood oxygenators were mechanically tested and based on these experimental data, a material model was developed to simulate the structural deformations the fibers undergo under press-fitting and blood pressure loads. Then, CFD simulations were performed on deformed bundle repetitive units to investigate permeability under varying loading conditions. The effects of different bundle geometric parameters on the variation of bundle permeability due to press-fitting were evaluated. Bundle press-fitting results in significant changes in microstructure that are reflected in a bundle permeability more than halved for a 15% press-fitting. This impact on permeability is present in all the simulated fiber bundles and becomes more pronounced as the pitch between fibers and thus bundle porosity decreases. Instead, the analyses on pressurized bundle show only small deformations caused by pressure load, with permeability changes below 1%. While blood pressure effects could be neglected, bundle press-fitting turns out to have a significant impact on bundle microstructure and permeability. Neglecting such microstructure variations during CFD simulations could also lead to incorrect assessment of the local fluid dynamics within the bundle.
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Affiliation(s)
- Gianluca Poletti
- LaBS - Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
| | - Davide Ninarello
- LaBS - Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy
| | - Giancarlo Pennati
- LaBS - Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy
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Strudthoff LJ, Focke J, Hesselmann F, Kaesler A, Martins Costa A, Schlanstein PC, Schmitz-Rode T, Steinseifer U, Steuer NB, Wiegmann B, Arens J, Jansen SV. Novel Size-Variable Dedicated Rodent Oxygenator for ECLS Animal Models-Introduction of the "RatOx" Oxygenator and Preliminary In Vitro Results. MICROMACHINES 2023; 14:800. [PMID: 37421033 DOI: 10.3390/mi14040800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 03/22/2023] [Accepted: 03/24/2023] [Indexed: 07/09/2023]
Abstract
The overall survival rate of extracorporeal life support (ECLS) remains at 60%. Research and development has been slow, in part due to the lack of sophisticated experimental models. This publication introduces a dedicated rodent oxygenator ("RatOx") and presents preliminary in vitro classification tests. The RatOx has an adaptable fiber module size for various rodent models. Gas transfer performances over the fiber module for different blood flows and fiber module sizes were tested according to DIN EN ISO 7199. At the maximum possible amount of effective fiber surface area and a blood flow of 100 mL/min, the oxygenator performance was tested to a maximum of 6.27 mL O2/min and 8.2 mL CO2/min, respectively. The priming volume for the largest fiber module is 5.4 mL, while the smallest possible configuration with a single fiber mat layer has a priming volume of 1.1 mL. The novel RatOx ECLS system has been evaluated in vitro and has demonstrated a high degree of compliance with all pre-defined functional criteria for rodent-sized animal models. We intend for the RatOx to become a standard testing platform for scientific studies on ECLS therapy and technology.
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Affiliation(s)
- Lasse J Strudthoff
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Jannis Focke
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Felix Hesselmann
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Andreas Kaesler
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Ana Martins Costa
- Department of Biomechanical Engineering, Faculty of Engineering Technologies, University of Twente, 7522 LW Enschede, The Netherlands
| | - Peter C Schlanstein
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Thomas Schmitz-Rode
- Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Ulrich Steinseifer
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Niklas B Steuer
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
| | - Bettina Wiegmann
- Department for Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, 30625 Hanover, Germany
- Lower Saxony Center for Biomedical Engineering, Implant Research and Development (NIFE), 30625 Hanover, Germany
- German Center for Lung Research (DLZ), 30625 Hanover, Germany
| | - Jutta Arens
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
- Department of Biomechanical Engineering, Faculty of Engineering Technologies, University of Twente, 7522 LW Enschede, The Netherlands
| | - Sebastian V Jansen
- Institute of Applied Medical Engineering, Department of Cardiovascular Engineering, Medical Faculty, RWTH Aachen University, 52074 Aachen, Germany
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Martins Costa A, Halfwerk F, Wiegmann B, Neidlin M, Arens J. Trends, Advantages and Disadvantages in Combined Extracorporeal Lung and Kidney Support From a Technical Point of View. FRONTIERS IN MEDICAL TECHNOLOGY 2022; 4:909990. [PMID: 35800469 PMCID: PMC9255675 DOI: 10.3389/fmedt.2022.909990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 05/25/2022] [Indexed: 11/13/2022] Open
Abstract
Extracorporeal membrane oxygenation (ECMO) provides pulmonary and/or cardiac support for critically ill patients. Due to their diseases, they are at high risk of developing acute kidney injury. In that case, continuous renal replacement therapy (CRRT) is applied to provide renal support and fluid management. The ECMO and CRRT circuits can be combined by an integrated or parallel approach. So far, all methods used for combined extracorporeal lung and kidney support present serious drawbacks. This includes not only high risks of circuit related complications such as bleeding, thrombus formation, and hemolysis, but also increase in technical workload and health care costs. In this sense, the development of a novel optimized artificial lung device with integrated renal support could offer important treatment benefits. Therefore, we conducted a review to provide technical background on existing techniques for extracorporeal lung and kidney support and give insight on important aspects to be addressed in the development of this novel highly integrated artificial lung device.
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Affiliation(s)
- Ana Martins Costa
- Engineering Organ Support Technologies Group, Department of Biomechanical Engineering, University of Twente, Enschede, Netherlands
- *Correspondence: Ana Martins Costa
| | - Frank Halfwerk
- Engineering Organ Support Technologies Group, Department of Biomechanical Engineering, University of Twente, Enschede, Netherlands
- Department of Cardiothoracic Surgery, Thorax Centrum Twente, Medisch Spectrum Twente, Enschede, Netherlands
| | - Bettina Wiegmann
- Lower Saxony Center for Biomedical Engineering, Implant Research and Development, Hannover Medical School, Hanover, Germany
- Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Hanover, Germany
- German Center for Lung Research, BREATH, Hannover Medical School, Hanover, Germany
| | - Michael Neidlin
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Jutta Arens
- Engineering Organ Support Technologies Group, Department of Biomechanical Engineering, University of Twente, Enschede, Netherlands
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Membranes for extracorporeal membrane oxygenator (ECMO): history, preparation, modification and mass transfer. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.05.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Hesselmann F, Arnemann D, Bongartz P, Wessling M, Cornelissen C, Schmitz-Rode T, Steinseifer U, Jansen SV, Arens J. Three-dimensional membranes for artificial lungs: Comparison of flow-induced hemolysis. Artif Organs 2021; 46:412-426. [PMID: 34606117 DOI: 10.1111/aor.14081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 08/11/2021] [Accepted: 09/22/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND Membranes based on triply periodic minimal surfaces (TPMS) have proven a superior gas transfer compared to the contemporary hollow fiber membrane (HFM) design in artificial lungs. The improved oxygen transfer is attributed to disrupting the laminar boundary layer adjacent to the membrane surface known as main limiting factor to mass transport. However, it requires experimental proof that this improvement is not at the expense of greater damage to the blood. Hence, the aim of this work is a valid statement regarding the structure-dependent hemolytic behavior of TPMS structures compared to the current HFM design. METHODS Hemolysis tests were performed on structure samples of three different kind of TPMS-based designs (Schwarz-P, Schwarz-D and Schoen's Gyroid) in direct comparison to a hollow fiber structure as reference. RESULTS The results of this study suggest that the difference in hemolysis between TPMS membranes compared to HFMs is small although slightly increased for the TPMS membranes. There is no significant difference between the TPMS structures and the hollow fiber design. Nevertheless, the ratio between the achieved additional oxygen transfer and the additional hemolysis favors the TPMS-based membrane shapes. CONCLUSION TPMS-shaped membranes offer a safe way to improve gas transfer in artificial lungs.
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Affiliation(s)
- Felix Hesselmann
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Helmholtz Institute, RWTH Aachen University, Aachen, Germany
| | - Daniel Arnemann
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Helmholtz Institute, RWTH Aachen University, Aachen, Germany
| | - Patrick Bongartz
- Chair of Chemical Process Engineering, RWTH Aachen University, Aachen, Germany
| | - Matthias Wessling
- Chair of Chemical Process Engineering, RWTH Aachen University, Aachen, Germany.,DWI-Leibniz Institute for Interactive Materials, RWTH Aachen University, Aachen, Germany
| | - Christian Cornelissen
- Department of Pneumology and Internal Intensive Care Medicine, Medical Clinic V, RWTH Aachen University Hospital, Aachen, Germany
| | - Thomas Schmitz-Rode
- Institute of Applied Medical Engineering, Helmholtz Institute, RWTH Aachen University, Aachen, Germany
| | - Ulrich Steinseifer
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Helmholtz Institute, RWTH Aachen University, Aachen, Germany
| | - Sebastian Victor Jansen
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Helmholtz Institute, RWTH Aachen University, Aachen, Germany
| | - Jutta Arens
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Helmholtz Institute, RWTH Aachen University, Aachen, Germany.,Chair of Engineering Organ Support Technologies, Department of Biomechanical Engineering, Faculty of Engineering, Technology University of Twente, Twente, The Netherlands
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Tang TQ, Hsu SY, Dahiya A, Soh CH, Lin KC. Numerical modeling of pulsatile blood flow through a mini-oxygenator in artificial lungs. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2021; 208:106241. [PMID: 34247118 DOI: 10.1016/j.cmpb.2021.106241] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/12/2021] [Indexed: 06/13/2023]
Abstract
While previous in vitro studies showed divergent results concerning the influence of pulsatile blood flow on oxygen advection in oxygenators, no study was done to investigate the uncertainty affected by blood flow dynamics. The aim of this study is to utilize a computational fluid dynamics model to clarify the debate concerning the influence of pulsatile blood flow on the oxygen transport. The computer model is based on a validated 2D finite volume approach that predicts oxygen transfer in pulsatile blood flow passing through a 300-micron hollow-fiber membrane bundle with a length of 254 mm, a building block for an artificial lung device. In this study, the flow parameters include the steady Reynolds number (Re = 2, 5, 10 and 20), Womersley parameter (Wo = 0.29, 0.38 and 0.53) and sinusoidal amplitude (A = 0.25, 0.5 and 0.75). Specifically, the computer model is extended to verify, for the first time, the previously measured O2 transport that was observed to be hindered by pulsating flow in the Biolung, developed by Michigan Critical Care Consultants. A comprehensive analysis is carried out on computed profiles and fields of oxygen partial pressure (PO2) and oxygen saturation (SO2) as a function of Re, Wo and A. Based on the present results, we observe the positive and negative effects of pulsatile flow on PO2 at different blood flow rates. Besides, the SO2 variation is not much influenced by the pulsatile flow conditions investigated. While being consistent with a recent experimental study, the computed O2 volume flow rate is found to be increased at high blood flow rates operated with low frequency and high amplitude. Furthermore, the present study qualitatively explains that divergent outcomes reported in previous in vitro experimental studies could be owing to the different blood flow rates adopted. Finally, the contour analysis reveals how the spatial distributions of PO2 and SO2 vary over time.
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Affiliation(s)
- Tao-Qian Tang
- Department of Internal Medicine, E-Da Hospital/I-Shou University, Kaohsiung 82445, Taiwan; School of Medicine, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan; International Intercollegiate Ph.D. Program, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Sheng-Yen Hsu
- Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
| | - Anurag Dahiya
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chang Hwei Soh
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Kuang C Lin
- International Intercollegiate Ph.D. Program, National Tsing Hua University, Hsinchu 30013, Taiwan; Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan; Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu 30013, Taiwan.
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Tabesh H, Rafiei F, Mottaghy K. In silico simulation of the liquid phase pressure drop through cylindrical hollow‐fiber membrane oxygenators using a modified phenomenological model. ASIA-PAC J CHEM ENG 2021. [DOI: 10.1002/apj.2633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hadi Tabesh
- Department of Life Science Engineering, Faculty of New Sciences and Technologies University of Tehran Tehran Iran
| | - Fojan Rafiei
- Department of Life Science Engineering, Faculty of New Sciences and Technologies University of Tehran Tehran Iran
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8
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Karagiannidis C, Strassmann S, Larsson A, Brodie D. The Hemovent Oxygenator: A New Low-Resistance, High-Performance Oxygenator. ASAIO J 2020; 67:e59-e61. [PMID: 32433307 DOI: 10.1097/mat.0000000000001190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Affiliation(s)
- Christian Karagiannidis
- From the Department of Pneumology and Critical Care Medicine, Cologne-Merheim Hospital, ARDS and ECMO Centre, Kliniken der Stadt Köln gGmbH, Witten/Herdecke University Hospital, Cologne, Germany
| | - Stephan Strassmann
- From the Department of Pneumology and Critical Care Medicine, Cologne-Merheim Hospital, ARDS and ECMO Centre, Kliniken der Stadt Köln gGmbH, Witten/Herdecke University Hospital, Cologne, Germany
| | - Anders Larsson
- Hedenstierna Laboratory, Anesthesiology and Intensive Care, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Daniel Brodie
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine and Center for Acute Respiratory Failure, Columbia University College of Physicians and Surgeons/New York-Presbyterian Hospital, New York
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Steuer NB, Hugenroth K, Beck T, Spillner J, Kopp R, Reinartz S, Schmitz-Rode T, Steinseifer U, Wagner G, Arens J. Long-Term Venovenous Connection for Extracorporeal Carbon Dioxide Removal (ECCO 2R)-Numerical Investigation of the Connection to the Common Iliac Veins. Cardiovasc Eng Technol 2020; 11:362-380. [PMID: 32405926 PMCID: PMC7385029 DOI: 10.1007/s13239-020-00466-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 05/02/2020] [Indexed: 02/06/2023]
Abstract
Purpose Currently used cannulae for extracorporeal carbon dioxide removal (ECCO2R) are associated with complications such as thrombosis and distal limb ischemia, especially for long-term use. We hypothesize that the risk of these complications is reducible by attaching hemodynamically optimized grafts to the patient’s vessels. In this study, as a first step towards a long-term stable ECCO2R connection, we investigated the feasibility of a venovenous connection to the common iliac veins. To ensure its applicability, the drainage of reinfused blood (recirculation) and high wall shear stress (WSS) must be avoided. Methods A reference model was selected for computational fluid dynamics, on the basis of the analysis of imaging data. Initially, a sensitivity analysis regarding recirculation was conducted using as variables: blood flow, the distance of drainage and return to the iliocaval junction, as well as the diameter and position of the grafts. Subsequently, the connection was optimized regarding recirculation and the WSS was evaluated. We validated the simulations in a silicone model traversed by dyed fluid. Results The simulations were in good agreement with the validation measurements (mean deviation 1.64%). The recirculation ranged from 32.1 to 0%. The maximum WSS did not exceed 5.57 Pa. The position and diameter of the return graft show the highest influence on recirculation. A correlation was ascertained between recirculation and WSS. Overall, an inflow jet directed at a vessel wall entails not only high WSS, but also a flow separation and thereby an increased recirculation. Therefore, return grafts aligned to the vena cava are crucial. Conclusion In conclusion, a connection without recirculation could be feasible and therefore provides a promising option for a long-term ECCO2R connection.
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Affiliation(s)
- N B Steuer
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany.
| | - K Hugenroth
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - T Beck
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - J Spillner
- Clinic for Cardiothoracic Surgery, University Hospital RWTH Aachen, Aachen, Germany
| | - R Kopp
- Department of Anesthesiology, University Hospital RWTH Aachen, Aachen, Germany
| | - S Reinartz
- Department of Radiology, University Hospital RWTH Aachen, Aachen, Germany
| | - T Schmitz-Rode
- Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - U Steinseifer
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - G Wagner
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - J Arens
- Department of Cardiovascular Engineering, Institute of Applied Medical Engineering, Medical Faculty, RWTH Aachen University, Aachen, Germany.,Chair in Engineering Organ Support Technologies, Department of Biomechanical Engineering, Faculty of Engineering Technologies, University of Twente, Enschede, The Netherlands
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