| Controller for an axial flow blood pump. | |
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MedLine Citation:
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PMID: 8817966 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A rotary blood pump inherently provides only one noninvasive "observable" parameter (motor current) and allows for only one "controllable" parameter (pump speed.) To maintain the systemic circulation properly, the pump seed must be controlled to sustain appropriate outlet flows and perfusion pressure while preventing pulmonary damage caused by extremes in preload. Steady-state data were collected at repeated intervals during chronic trials of the Nimbus AxiPump (Nimbus, Inc., Rancho Cordova, California, U.S.A.) in sheep (n = 7) and calves (n = 12). For each data set, the pump speed was increased at increments of 500 rpm until left ventricular and left atrial emptying was observed by left atrial pressure diminishing to zero. The effect of decreasing preload was evaluated perioperatively by inferior vena cava occlusion at a constant pump speed. Fourier analysis established a relationship between changes in the pump preload and the power spectra of the pump current waveform. Based on these results, a control method was devised to avoid ventricular collapse and maintain the preload within a physiologic range. The objective of this controller is the minimization of the second and third harmonic of the periodic current waveform. This method is intended to provide a noninvasive regulation of the pump by eliminating the need for extraneous transducers. |
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Authors:
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H Konishi; J F Antaki; D V Amin; J R Boston; J P Kerrigan; W A Mandarino; P Litwak; K Yamazaki; M Macha; K C Butler; H S Borovetz; R L Kormos |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Artificial organs Volume: 20 ISSN: 0160-564X ISO Abbreviation: Artif Organs Publication Date: 1996 Jun |
Date Detail:
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Created Date: 1996-12-11 Completed Date: 1996-12-11 Revised Date: 2007-11-15 |
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: 618-20 Citation Subset: IM |
Affiliation:
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University of Pittsburgh, Artificial, Heart and Lung Program, School of Medicine, Pennsylvania, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Flow Velocity / physiology Equipment Design / trends Heart-Assist Devices / standards*, trends Hemodynamics / physiology* Quality Control Sheep Ultrasonography |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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