NDLI: Magnetic levitation design for the PediaFlow ventricular assist device

Content Provider	IEEE Xplore Digital Library
Author	Noh, M.D. Antaki, J.E. Ricci, M. Gardiner, J. Prem, E. Borovetz, H.S. Paden, B.E.
Copyright Year	2005
Description	Author affiliation: Dept. of Mechatronics Eng., Chungnam Nat. Univ., Daejeon (Noh, M.D.)
Abstract	Over the past few decades, we have seen a tremendous progress in the development of implantable ventricular assist devices (VAD). However, these devices are mainly developed for adult patients. For the patients under age 5 who have chronic heart failures, physicians must resort to extracorporeal circulatory support devices which often result in infection, thromboembolism, or excessive blood transfusions. In this paper, we describe a design process for a pediatric ventricular assist device (PVAD). The central part of the device is a magnetically levitated rotating pump which creates a pressure rise (~100 mmHg) at a required flow rate (~0.5 L/min) suitable for infants and small children. We have considered several different pump topologies, of which an axial mixed-flow pump configuration was chosen for further development. The pump impeller is supported by two radial permanent-magnet passive bearings. The rotor-dynamics analysis of the pump shows that the critical speeds of the pump are affected by the radial and yaw stiffnesses of the PM bearings. Hence, analytical expressions for the stiffnesses are derived and verified through FEA. In contrast to the radial suspension, the axial motion of the impeller is actively controlled using a voice-coil actuator. A toroidally-wound motor drives the pump with high efficiency and little additional negative radial stiffness. The design process relies heavily on optimization at the component-level and system-level. The preliminary results of the design optimization are presented in this paper
Starting Page	1077
Ending Page	1082
File Size	257242
Page Count	6
File Format	PDF
ISBN	0780390474
DOI	10.1109/AIM.2005.1511153
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic levitation Process design Pediatrics Impellers Design optimization Heart Blood Magnetic devices Toroidal magnetic fields Topology
Content Type	Text
Resource Type	Article

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