NDLI: Sensorless measurement of the pulsatile flow through an implantable maglev centrifugal blood pump during ventricular assistance

Content Provider	IEEE Xplore Digital Library
Author	Chi Nan Pai Shinshi, T. Shimokohbe, A.
Copyright Year	2009
Description	Author affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan (Chi Nan Pai) \|\| Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Japan (Shinshi, T.; Shimokohbe, A.)
Abstract	We developed a centrifugal blood pump (CBP), incorporating a radial-controlled magnetic bearing (MB) and a brushless DC motor to assist the failing heart ventricle. To control the flow through the CBP, real-time measurement of pulsatile flow is required. However, the use of conventional flow sensors is not desirable due to issues of compactness and durability. The radial thrust acting on a magnetically levitated impeller depends on the pump flow. In this study, we present a method for estimating pulsatile flow during ventricular assistance, based on the radial thrust estimated by a disturbance force observer of the MB. To design this observer, parameters of the dynamic model of a magnetically levitated impeller were identified under different flow conditions, assuming the density and viscosity of water to be constant. The disturbance force observers were designed based on linear models that were obtained for a given rotational speed. The relationship between pump flow and radial thrust was first identified experimentally under non-pulsatile flow conditions. Then, using this relationship and the measured radial thrust, the pump flow was estimated under pulsatile flow conditions and a high correlation was achieved between the measured and the estimated flows.
Starting Page	3335
Ending Page	3338
File Size	368804
Page Count	4
File Format	PDF
ISBN	9784907764340
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-18
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	SICE
Subject Keyword	Fluid flow measurement Magnetic levitation Blood Impellers Brushless DC motors Heart ventricles Sensorless control Magnetic sensors Force sensors Viscosity Pulsatile flow Centrifugal blood pump Magnetic bearing entricular assist device Sensorless measurement Radial thrust
Content Type	Text
Resource Type	Article

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