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    
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.
H Kim; H C Kim
Related Documents :
8204809 - Assisted circulation without systemic heparinization.
7127679 - Isolated cat trabeculae in a simulated feline heart and arterial system. contractile ba...
17651119 - Effects of tongue position and base circle diameter on the performance of a centrifugal...
3035669 - Hemodynamic mechanisms in cpr: a theoretical rationale for resuscitative thoracotomy in...
10886069 - Paradoxical effects of viscosity on the ventrassist rotary blood pump.
12116129 - Electroosmotic pumping in microchips with nonhomogeneous distribution of electrolytes.
9203889 - The effect of single-handed cricoid pressure on neck movement after applying manual in-...
10501749 - Comparison of systemic and regional effects of dobutamine and dopexamine in norepinephr...
8866899 - Ambulatory blood pressure normality: results from the pamela study.
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    
Interdisciplinary Program, Graduate School, Seoul National University, Korea.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Equipment Design
Heart-Assist Devices*

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

Previous Document:  A feedback controller for the maintenance of FRC during tidal liquid ventilation: theory, implementa...
Next Document:  In vivo and in vitro experience with the PUCA-II, a single-valved pulsatile catheter-pump.