Parameter Estimation and Actuator Characteristics of Hybrid Magnetic Bearings for Axial Flow Blood Pump Applications

Lim, Teck Meng; Cheng, Shanbao; Chua, Leok Poh

doi:10.1111/j.1525-1594.2009.00732.x

Cited by 9 publications

(9 citation statements)

References 21 publications

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“…Tau Meng Lim et al. (29) of Nanyang Technological University, Singapore reported on the design, levitated responses, and parameter estimation of the dynamic characteristics of a compact hybrid magnetic bearing (HMB) system for axial flow blood pump applications. Experimental estimation showed that the dynamic characteristics of the HMB system are dominated by the frequency‐dependent stiffness coefficients.…”

Section: Cardiac Support and Blood Pumpsmentioning

confidence: 99%

Artificial Organs 2009: A Year in Review

Malchesky¹

2010

Artificial Organs

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In this editor's review, all articles published in 2009 are organized by category and briefly summarized. As Artificial Organs continues in the original mission of its founders "to foster communications in the field of artificial organs on an international level," we strive to publish the very best developments and clinical applications of artificial organ technologies in this broad and expanding field. In this editor's review, we aim to provide a reflection of the currently available worldwide knowledge that is intended to advance and improve human life while providing insight for continued application of technologies and methods of organ replacement, recovery, and regeneration. APHERESISClaudia Stefanutti et al. (1) of the University of Rome, Rome, Italy studied lowering lipoprotein Lp(a) using a reusable low density lipoprotein (LDL)-adsorber that allowed the removal of both LDL and Lp(a) from plasma. Two male patients with hyper-Lp(a) lipoproteinemia, without elevation of LDL-cholesterol, who had not responded to diet and medication were submitted to 50 LDL Lp(a) aphereses at weekly and biweekly intervals. Total cholesterol, LDL cholesterol, triglycerides, and Lp(a) plasma levels fell significantly. High density lipoprotein (HDL) cholesterol concentrations in plasma did not show a statistically significant change. Clinically, all sessions were well tolerated and no undesired reactions were reported. The adsorber's reusability for several sessions was confirmed.Claudia Stefanutti et al.(2) also reported on a multicenter study of therapeutic exchange (TPE) in patients with severe hypertriglyceridemia (sHTG). Seventeen patients who had not responded to conventional medical therapy (fat-free diet plus pharmaceutical interventions) were referred for TPE. Two hundred and seventeen TPE sessions were performed, and therapy is ongoing for 29.4% of the patients. After treatment, the mean plasma TG and total cholesterol concentrations were significantly reduced. The removal of triglyceride-richlipoproteins prevented relapses of acute pancreatitis. TPE provides a therapeutic option for preventing life-threatening sHTG. BLOOD SUBSTITUTESSabura Neya et al.(3) of Chiba University, Inage-Yayoi, Chiba, Japan evaluated the biological function of the core modified porphyrin isomers such as porphycene, corrphycene, and hemiporphycene. The iron complexes stoichiometrically coupled with apomyoglobin afford stable holoproteins. The oxygen affinity of the reconstituted myoglobins (Mb) changed over a 60 000-fold range depending on the

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Section: Cardiac Support and Blood Pumpsmentioning

confidence: 99%

Artificial Organs 2009: A Year in Review

Malchesky¹

2010

Artificial Organs

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“…They work satisfactorily at high shaft speeds, while at lower speeds the sealing fluid is not kept in place and in the static condition the seal does not support any pressure at all. Other difficulties associated with conventional centrifugal seals include problems related to fluid leakage, limited lifetime due to the wear of elastomer seal, high torque, and high static friction, which result from the use of elastomeric auxiliary seals [56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

New Designs of Centrifugal Magnetic Fluid Seals for Rotating Shafts in Marine Technology

Matuszewski

2019

Polish Maritime Research

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The centrifugal magnetic fluid seals have important advantage over the conventional centrifugal seals. They maintain very good sealing capacity at static, medium and high speeds of shaft rotation, with the increased seal lifetime, and minimum torque and static friction. These seals are particularly useful in cases when the angular shaft velocity varies and sometimes decreases to nearly or exactly zero, such as in flywheel applications, ship propeller main shafts, etc. Unique properties of the magnetic fluid give rare opportunities for application in marine design, where perfect sealing together with reliable lubrication are required. The paper presents a typical design and operation principle of a centrifugal magnetic fluid shaft seal, along with new design solutions. Not only in ocean technology and underwater robotics. Some cases of application of centrifugal magnetic fluid seals in modern sealing technology are included.

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“…Actuators are important for the performance of blood pumps and are intrinsically connected to the operation of the equipment. Several topologies have been proposed over the years in area of artificial organs and VADs …”

Section: Introductionmentioning

confidence: 99%

A strategy for designing of customized electromechanical actuators of blood pumps

et al. 2019

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Congestive heart failure is a pathology of global incidence that affects more than 20 millions of people worldwide. It is largely categorized and consists of a progressive clinical state when the heart weakens and fails to pump blood at physiological rates commensurate with the requirements of tissues. Thus, two main alternatives for treatment are cardiac transplant and therapies associated with ventricular assist devices (VADs). 1,2 The implantable centrifugal blood pump (ICBP) is a VAD for long-term assistance initially designed for bridge to transplant (BTT) in conjunction with several research institutions. 3,4 Actuators are important for the performance of blood pumps and are intrinsically connected to the operation of the equipment. Several topologies have been proposed over the years in area of artificial organs and VADs. 5-14 This article presents a design strategy for development of a customized electromagnetic actuator for ICBP elaborated

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Parameter Estimation and Actuator Characteristics of Hybrid Magnetic Bearings for Axial Flow Blood Pump Applications

Cited by 9 publications

References 21 publications

Artificial Organs 2009: A Year in Review

Artificial Organs 2009: A Year in Review

New Designs of Centrifugal Magnetic Fluid Seals for Rotating Shafts in Marine Technology

A strategy for designing of customized electromechanical actuators of blood pumps

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