Document Detail


Modeling and control of a magnetic bearing system for the magnetically suspended centrifugal blood pump.
MedLine Citation:
PMID:  11075899     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We have developed a centrifugal blood pump with a magnetically suspended impeller to reduce the hemolysis level for long-term use. The main advance we have made was simplifying the traditional 5 axes controlled magnetic bearing system, since the total device should ultimately be small enough to implant into a human body. A simplified magnetic bearing system with only 3 actively controlled axes was designed to levitate the impeller. The state equations of the magnetic bearing plant were established using Lagrange's methods, and using the results, a linear quadratic optimal controller was designed to regulate the position of the impeller. Flow rate and differential pressure of 5L/min and 300 mmHg, respectively at a motor speed of 2750 rpm was achieved from a mock circulation setup. These results show satisfactory performance as a cardiopulmonary bypass device. The lowering of pumping efficiency as the clearance between the impeller and pump housing increased was negligible. Thus for power efficiency, the smallest gap not leading to a hemolysis level rise can be determined as a feasible operation clearance.
Authors:
H Kim; H C Kim
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The International journal of artificial organs     Volume:  23     ISSN:  0391-3988     ISO Abbreviation:  Int J Artif Organs     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2001-02-28     Completed Date:  2001-03-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7802649     Medline TA:  Int J Artif Organs     Country:  ITALY    
Other Details:
Languages:  eng     Pagination:  689-96     Citation Subset:  IM    
Affiliation:
Interdisciplinary Program, Graduate School, Seoul National University, Korea.
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Centrifugation
Equipment Design
Heart-Assist Devices*
Hemolysis
Humans
Magnetics
Rheology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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