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Methods for determination of stagnation in pneumatic ventricular assist devices
BACKGROUND: A pneumatic paediatric ventricular assist device developed at the Foundation of Cardiac Surgery Development, Zabrze, equipped with valves based on J. Moll’s design, with later modifications introduced at the Institute of Turbomachinery, Lodz University of Technology, was tested numerical...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
SAGE Publications
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6159782/ https://www.ncbi.nlm.nih.gov/pubmed/30073903 http://dx.doi.org/10.1177/0391398818790204 |
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author | Obidowski, Damian Reorowicz, Piotr Witkowski, Dariusz Sobczak, Krzysztof Jóźwik, Krzysztof |
author_facet | Obidowski, Damian Reorowicz, Piotr Witkowski, Dariusz Sobczak, Krzysztof Jóźwik, Krzysztof |
author_sort | Obidowski, Damian |
collection | PubMed |
description | BACKGROUND: A pneumatic paediatric ventricular assist device developed at the Foundation of Cardiac Surgery Development, Zabrze, equipped with valves based on J. Moll’s design, with later modifications introduced at the Institute of Turbomachinery, Lodz University of Technology, was tested numerically and experimentally. The main aim of those investigations was to detect stagnation zones within the ventricular assist device and indicate advantages and limitations of both approaches. METHODS: In the numerical transient test, a motion of the diaphragm and discs was simulated. Two different methods were used to illustrate stagnation zones in the ventricular assist device. The flow pattern inside the chamber was represented by velocity contours and vectors to validate the results using images obtained in the laser particle image velocimetry experiment. RESULTS: The experimental light-based method implied problems with proper illumination of regions in the wall vicinity. High-resolution flow data and other important parameters as stagnation regions or flow patterns in regions not accessible for light in the particle image velocimetry method are derived in the numerical solution. However, computations of a single case are much more time-consuming if compared to a single experiment conducted on a well-calibrated stand. CONCLUSION: The resulting main vortexes in the central part of the pump chamber and the velocity magnitudes are correlated in both methods, which are complementary and when used together offer better insight into the flow structure inside the ventricular assist device and enable a deeper analysis of the results. |
format | Online Article Text |
id | pubmed-6159782 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-61597822018-10-11 Methods for determination of stagnation in pneumatic ventricular assist devices Obidowski, Damian Reorowicz, Piotr Witkowski, Dariusz Sobczak, Krzysztof Jóźwik, Krzysztof Int J Artif Organs Original Research Articles BACKGROUND: A pneumatic paediatric ventricular assist device developed at the Foundation of Cardiac Surgery Development, Zabrze, equipped with valves based on J. Moll’s design, with later modifications introduced at the Institute of Turbomachinery, Lodz University of Technology, was tested numerically and experimentally. The main aim of those investigations was to detect stagnation zones within the ventricular assist device and indicate advantages and limitations of both approaches. METHODS: In the numerical transient test, a motion of the diaphragm and discs was simulated. Two different methods were used to illustrate stagnation zones in the ventricular assist device. The flow pattern inside the chamber was represented by velocity contours and vectors to validate the results using images obtained in the laser particle image velocimetry experiment. RESULTS: The experimental light-based method implied problems with proper illumination of regions in the wall vicinity. High-resolution flow data and other important parameters as stagnation regions or flow patterns in regions not accessible for light in the particle image velocimetry method are derived in the numerical solution. However, computations of a single case are much more time-consuming if compared to a single experiment conducted on a well-calibrated stand. CONCLUSION: The resulting main vortexes in the central part of the pump chamber and the velocity magnitudes are correlated in both methods, which are complementary and when used together offer better insight into the flow structure inside the ventricular assist device and enable a deeper analysis of the results. SAGE Publications 2018-08-03 2018-10 /pmc/articles/PMC6159782/ /pubmed/30073903 http://dx.doi.org/10.1177/0391398818790204 Text en © The Author(s) 2018 http://www.creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage). |
spellingShingle | Original Research Articles Obidowski, Damian Reorowicz, Piotr Witkowski, Dariusz Sobczak, Krzysztof Jóźwik, Krzysztof Methods for determination of stagnation in pneumatic ventricular assist devices |
title | Methods for determination of stagnation in pneumatic ventricular assist devices |
title_full | Methods for determination of stagnation in pneumatic ventricular assist devices |
title_fullStr | Methods for determination of stagnation in pneumatic ventricular assist devices |
title_full_unstemmed | Methods for determination of stagnation in pneumatic ventricular assist devices |
title_short | Methods for determination of stagnation in pneumatic ventricular assist devices |
title_sort | methods for determination of stagnation in pneumatic ventricular assist devices |
topic | Original Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6159782/ https://www.ncbi.nlm.nih.gov/pubmed/30073903 http://dx.doi.org/10.1177/0391398818790204 |
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