A magnetically levitated (maglev) centrifugal blood pump (CBP), intended for use as a ventricular assist device, needs to be highly durable and reliable for long-term use without any mechanical failure. Furthermore, maglev CBPs should be small enough to be implanted into patients of various size and weight. We have developed a compact maglev CBP employing a two-degree-of-freedom controlled magnetic bearing, with a magnetically suspended impeller directly driven by an internal brushless direct current (DC) motor. The magnetic bearing actively controls the radial motion of the impeller and passively supports axial and angular motions using a permanent magnet embedded in the impeller. The overall dimensions of the maglev CBP are 65 mm in diameter and 40 mm in height. The total power consumption and pump efficiency for pumping 6 L/min against a head pressure of 105 mm Hg were 6.5 W and 21%, respectively. To evaluate the characteristics of the maglev CBP when subjected to a disturbance, excitation of the base, simulating the movement of the patient in various directions, and the sudden interception of the outlet tube connected with the pump in a mock circulatory loop, simulating an unexpected kink and emergent clamp during a heart surgery, were tested by monitoring the five-degree-of-freedom motion of the impeller. Furthermore, the hemolytic characteristics of the maglev CBP were compared with those of the Medtronic Biomedicus BPX-80, which demonstrated the superiority of the maglev CBP.
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Hemocompatibility-Related Outcomes in the MOMENTUM 3 Trial at 6 Months: A Randomized Controlled Study of a Fully Magnetically Levitated Pump in Advanced Heart Failure.
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From University of Chicago School of Medicine and Medical Center, IL (N.U., V.J.); Columbia University College of Physicians and Surgeons and New York Presbyterian Hospital, New York, NY (P.C.C.); University of Colorado School of Medicine, Denver (J.C.C.); Integris Baptist Medical Center, Oklahoma City, OK (J.W.L.); St. Vincent Heart Center, Indianapolis, IN (C.S.); Montefiore Einstein Center for Heart and Vascular Care, Bronx, NY (D.J.G.); Duke Heart Center, Duke University, Durham, NC (C.B.P.); Washington University School of Medicine, St. Louis, MO (G.A.E.); Advocate Christ Medical Center, Chicago, IL (A.J.T.); Florida Hospital, Orlando (S.C.S.); University of Minnesota Medical Center, Minneapolis (R.J.); Tampa General Hospital, FL (C.C.); Thomas Jefferson University, Philadelphia, PA (A.J.B.); Abbott, Pleasanton, CA (K.S.S.); Abbott, Burlington, MA (P.S.); and Brigham and Women's Hospital Heart and Vascular Center and Harvard Medical School, Boston, MA (M.R.M.).
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View Article and Find Full Text PDFA compact highly efficient and low hemolytic centrifugal blood pump with a magnetically levitated impeller.
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Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan.
A magnetically levitated (maglev) centrifugal blood pump (CBP), intended for use as a ventricular assist device, needs to be highly durable and reliable for long-term use without any mechanical failure. Furthermore, maglev CBPs should be small enough to be implanted into patients of various size and weight. We have developed a compact maglev CBP employing a two-degree-of-freedom controlled magnetic bearing, with a magnetically suspended impeller directly driven by an internal brushless direct current (DC) motor.
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