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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Single Axis Controlled Hybrid Magnetic Bearing for Left Ventricular Assist Device: Hybrid Core and Closed Magnetic Circuit

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Author(s):
da Silva, Isaias [1] ; Horikawa, Oswaldo [2] ; Cardoso, Jose R. [2] ; Camargo, Fernando A. [2] ; Andrade, Aron J. P. [3] ; Bock, Eduardo G. P. [3]
Total Authors: 6
Affiliation:
[1] Univ Fed Sao Paulo, Dept Exact Sci & Earth, BR-09972270 Diadema, SP - Brazil
[2] Univ Sao Paulo, Escola Politecn, BR-05508 Sao Paulo - Brazil
[3] Inst Dante Pazzanese Cardiol, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ARTIFICIAL ORGANS; v. 35, n. 5, p. 448-453, MAY 2011.
Web of Science Citations: 2
Abstract

In previous studies, we presented main strategies for suspending the rotor of a mixed-flow type (centrifugal and axial) ventricular assist device (VAD), originally presented by the Institute Dante Pazzanese of Cardiology (IDPC), Brazil. Magnetic suspension is achieved by the use of a magnetic bearing architecture in which the active control is executed in only one degree of freedom, in the axial direction of the rotor. Remaining degrees of freedom, excepting the rotation, are restricted only by the attraction force between pairs of permanent magnets. This study is part of a joint project in development by IDPC and Escola Politecnica of Sao Paulo University, Brazil. This article shows advances in that project, presenting two promising solutions for magnetic bearings. One solution uses hybrid cores as electromagnetic actuators, that is, cores that combine iron and permanent magnets. The other solution uses actuators, also of hybrid type, but with the magnetic circuit closed by an iron core. After preliminary analysis, a pump prototype has been developed for each solution and has been tested. For each prototype, a brushless DC motor has been developed as the rotor driver. Each solution was evaluated by in vitro experiments and guidelines are extracted for future improvements. Tests have shown good results and demonstrated that one solution is not isolated from the other. One complements the other for the development of a single-axis-controlled, hybrid-type magnetic bearing for a mixed-flow type VAD. (AU)

FAPESP's process: 06/58773-1 - Implantable electromagnetic propulsion systems for uni and biventricular or artifical heart blood circulatory assist devices
Grantee:José Roberto Cardoso
Support Opportunities: Research Projects - Thematic Grants