Magnetic Suspension Technology for Artificial Heart

2015 ◽  
Vol 135 (9) ◽  
pp. 613-616
Author(s):  
Toru MASUZAWA
Keyword(s):  
Artificial Heart ◽  
Magnetic Suspension

Optimal Adaptive Magnetic Suspension Control of Rotary Impeller for Artificial Heart Pump

2021 ◽  
pp. 1-27
Author(s):  
Amjad J. Humaidi ◽  
Saleem Khalefa Kadhim ◽  
Ahmed Sharhan Gataa
Keyword(s):  
Artificial Heart ◽  
Magnetic Suspension ◽  
Heart Pump ◽  
Suspension Control

A Prototype Left Ventricular Assist Artificial Heart Pump: An Integrated Permanent Magnet and Active Magnetic Bearing Suspension System

2014 ◽  
Author(s):  
Paul Allaire ◽  
Wei Jiang ◽  
Arunvel Kailasan ◽  
Timothy Dimond
Keyword(s):  
Artificial Heart ◽  
Permanent Magnets ◽  
Magnetic Bearing ◽  
Left Ventricular ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Active Magnetic Bearing ◽  
Low Flow ◽  
Pump Impeller ◽  
Ventricular Assist

The progress in the development of ventricular assist artificial heart pumps is continuing. This paper describes the magnetic suspension for a unique prototype axial flow pump designed for approximately 6 L/min at 100 mm Hg performance with an operating speed of approximately 7,000 rpm. The integrated magnetic suspension design provides a direct non-contact blood flow path through the pump with no obstructions which might create low flow areas and thrombosis (blood clots). The magnetic suspension is a combination of permanent magnets (PMs) and active magnetic bearings (AMBs). There are two radial AMBs which support the four degrees of freedom at the ends of the axial pump impeller and an axial PM thrust bearing. The axial PM bearing supports the direction of the largest fluid force on the impeller. A major objective of artificial hearts is to have extremely low power consumption. Thus the integrated PM and AMB suspension system has an operating magnetic suspension power of approximately 2 watts. The design, numerical modeling, and testing of the magnetic suspension system to support the fluid loads and the g loads are described in the paper.

Calculation of Dynamic Coefficients for a Magnetically Levitated Artificial Heart Pump Using a CFD Approach

2008 ◽  
Author(s):  
Alexandrina Untaroiu ◽  
Houston G. Wood ◽  
Paul E. Allaire ◽  
Timothy W. Dimond
Keyword(s):  
Artificial Heart ◽  
Operating Conditions ◽  
Magnetic Suspension ◽  
Magnetic Bearings ◽  
Ventricular Assist Devices ◽  
Ventricular Assist ◽  
Fluid Medium ◽  
Fluid Forces ◽  
Operational Life ◽  
Rotating Impeller

The artificial heart community acknowledges the 3rd generation Ventricular Assist Devices (VADs) as the leading technology in mechanical blood pump development. This category consists of rotary pumps with no mechanical or fluid bearings in contact with the fluid medium, usually magnetic or noncontacting hydrodynamic bearings. A magnetic suspension prevents the rotating impeller from contacting the pump’s internal surfaces and reduces regions of stagnant and high shear flow that normally surround a fluid or mechanical bearing. Magnetic bearings have no moving parts in contact and thus do not wear over time; this generally lengthens the operational life of the pumps as compared to those supported by conventional bearings. Employing this 3rd generation technology, the University of Virginia has been developing a ventricular assist device (LifeFlow) with a rotor that is suspended entirely by magnetic bearings. In order to perform the stability analysis, the hydrodynamic effects of the rotating impeller should be included in the calculation. This study describes the method to calculate the stiffness, damping, and mass coefficients, based on the CFD prediction of radial fluid forces exerted on the impeller due to its eccentric position inside the pump housing over a range of operating conditions. In consideration of the suspension design, the fluid forces exerted on the levitated axial impeller were estimated using CFD such that any fluid perturbations would be accounted for and counterbalanced during the suspension and motor design phase.

Operative techniques for implantation of the AbioCor total artificial heart

2002 ◽  
Vol 7 (3) ◽  
pp. 131-139
Author(s):  
Robert D. Dowling ◽  
Steven W. Etoch ◽  
Laman A. Gray
Keyword(s):  
Artificial Heart ◽  
Total Artificial Heart ◽  
Operative Techniques

Case report: Neuropsychological therapy for patient with a total artificial heart

2012 ◽  
Vol 60 (S 01) ◽  
Author(s):  
Y Brocks ◽  
M Schoenbrodt ◽  
M Morshuis ◽  
J Gummert ◽  
K Tigges-Limmer
Keyword(s):  
Case Report ◽  
Artificial Heart ◽  
Total Artificial Heart

Risk factor analysis for survival in CardioWest total artificial heart recipients: A pilot study

2013 ◽  
Vol 61 (S 01) ◽  
Author(s):  
M Dia ◽  
A Zittermann ◽  
E von Rössing ◽  
JF Gummert ◽  
M Morshuis
Keyword(s):  
Factor Analysis ◽  
Risk Factor ◽  
Pilot Study ◽  
Artificial Heart ◽  
Total Artificial Heart ◽  
Risk Factor Analysis

Magnetic suspension mechanism using rotary permanent magnets

2020 ◽  
Vol 64 (1-4) ◽  
pp. 977-983
Author(s):  
Koichi Oka ◽  
Kentaro Yamamoto ◽  
Akinori Harada
Keyword(s):  
Permanent Magnets ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Horizontal Force ◽  
Mechanical Contact ◽  
New Type ◽  
Magnetic Suspension System

This paper proposes a new type of noncontact magnetic suspension system using two permanent magnets driven by rotary actuators. The paper aims to explain the proposed concept, configuration of the suspension system, and basic analyses for feasibility by FEM analyses. Two bar-shaped permanent magnets are installed as they are driven by rotary actuators independently. Attractive forces of two magnets act on the iron ball which is located under the magnets. Control of the angles of two magnets can suspend the iron ball stably without mechanical contact and changes the position of the ball. FEM analyses have been carried out for the arrangement of two permanent magnets and forces are simulated for noncontact suspension. Hence, successfully the required enough force against the gravity of the iron ball can be generated and controlled. Control of the horizontal force is also confirmed by the rotation of the permanent magnets.

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