| Performance of a continuous flow ventricular assist device: magnetic bearing design, construction, and testing. | |
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MedLine Citation:
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PMID: 9650668 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A new centrifugal continuous flow ventricular assist device, the CFVAD III, which is fully magnetic bearing suspended, has been developed. It has only one moving part (the impeller), has no contact (magnetic suspension), is compact, and has minimal heating. A centrifugal impeller of 2 inch outer diameter is driven by a permanent magnet brushless DC motor. This paper discusses the design, construction, testing, and performance of the magnetic bearings in the unit. The magnetic suspension consists of an inlet side magnetic bearing and an outlet side magnetic bearing, each divided into 8 pole segments to control axial and radial displacements as well as angular displacements. The magnetic actuators are composed of several different materials to minimize size and weight while having sufficient load capacity to support the forces on the impeller. Flux levels in the range of 0.1 T are employed in the magnetic bearings. Self sensing electronic circuits (without physical sensors) are employed to determine the impellar position and provide the feedback control signal needed for the magnetic bearing control loops. The sensors provide position sensitivity of approximately 0.025 mm. A decentralized 5 axis controller has been developed using modal control techniques. Proportional integral derivative controls are used for each axis to levitate the magnetically supported impeller. |
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Authors:
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P Allaire; E Hilton; M Baloh; E Maslen; G Bearnson; D Noh; P Khanwilkar; D Olsen |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Artificial organs Volume: 22 ISSN: 0160-564X ISO Abbreviation: Artif Organs Publication Date: 1998 Jun |
Date Detail:
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Created Date: 1998-09-08 Completed Date: 1998-09-08 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 7802778 Medline TA: Artif Organs Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 475-80 Citation Subset: IM |
Affiliation:
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Mechanical, Aerospace, and Nuclear Engineering, University of Virginia, Charlottesville 22901, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Computer Simulation Electric Power Supplies Electricity Electronics, Medical / instrumentation Feedback Heart-Assist Devices* Hemorheology Hot Temperature Humans Magnetics* Materials Testing Prosthesis Design* Surface Properties |
| Grant Support | |
ID/Acronym/Agency:
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1R43HL55807/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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