NDLI: Magnetically actuated heart assist pump

Content Provider	IEEE Xplore Digital Library
Author	Kovacs, S. Johnson, T. Weber, D. Yarnoz, M.
Copyright Year	1965
Abstract	Magnetic actuation, requiring no moving, mechanical parts, as a direct magnetic-to-hydraulic energy conversion system for producing pulsatile pumping for a left ventricular assist device (LVAD), was investigated and proven. An axi-symmetric, ellipsoidal pump was built using the three magnetic actuators mounted 120° around the ellipsoidal bladder. Each actuator consists of a variable rate dc-pulsed electromagnet opposite a like polarity rare-earth cobalt permanent magnet attached to the bladder. The ellipsoidal pump geometry imposed two severe design constraints: magnetic force vector alignment and limitation of effective area available for magnetic pumping force application. Efforts to increase the flux density of the electromagnet led to the development of several advanced passive techniques for flux enhancement, e.g., use of smaller permanent magnets critically located in the electromagnet core, shaped core geometry, and flux shell geometry. These have virtually doubled dynamic flux density to values exceeding 0.8 web/m2, with no additional power consumption. Preliminary data indicate that shaped, hollow cores, such as prolate spheroids, providing core weight reductions to 60% will enable in excess of 95% solid core flux.
Sponsorship	IEEE Magnetics Society
Starting Page	1068
Ending Page	1070
Page Count	3
File Size	299390
File Format	PDF
ISSN	00189464
Volume Number	16
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1980-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heart Magnetic flux Electromagnets Geometry Magnetic cores Magnetic devices Actuators Bladder Permanent magnets Energy conversion
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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