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Test Controller Design, Implementation, and Performance for a Magnetic Suspension Continuous Flow Ventricular Assist Device
Author(s) -
Hilton Edgar F.,
Allaire Paul E.,
Wei Naihong,
Baloh Michael J.,
Bearnson Gill,
Olsen Don B.,
Khanwilkar Pratap
Publication year - 1999
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.1999.06424.x
Subject(s) - impeller , magnetic bearing , suspension (topology) , electromagnetic suspension , centrifugal pump , pulsatile flow , controller (irrigation) , actuator , pid controller , engineering , mechanical engineering , control theory (sociology) , computer science , materials science , electrical engineering , control (management) , medicine , temperature control , agronomy , mathematics , artificial intelligence , homotopy , biology , pure mathematics , cardiology , magnet
A new continuous flow ventricular assist device using full magnetic suspension has been designed, constructed, and tested. The magnetic suspension centers the centrifugal pump impeller within the clearance passages in the pump, thus avoiding any form of contact. The noncontact operation is designed to give very high expected mechanical reliability, large clearances, low hemolysis, and a relatively small size compared to current pulsatile devices. A unique configuration of magnetic actuators on the inlet side and exit sides of the impeller provides full 5 axis control and suspension of the impeller. The bearing system is divided into segments which allow for 3 displacement axes and 2 angular control axes. The controller chosen for the first suspension tests consists of a decentralized set of 5 proportional integral derivative (PID) controllers. This document describes both the controller and an overview of some results pertaining to the magnetic bearing performance. The pump has been successfully operated in both water and blood under design conditions suitable for use as a ventricular assist device.