The Motion of Levitated Impeller at Maglev Cascade Pump for Thin Ventricular Assist Device

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  • 薄小型補助人工心臓用磁気浮上カスケードポンプのインペラ浮上特性
  • ハクコガタ ホジョ ジンコウ シンゾウヨウ ジキ フジョウ カスケードポンプ ノ インペラ フジョウ トクセイ

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<p>We have developed a small, thin, maglev ventricular assist device that can be implanted under the thorax muscle layer like a pacemaker. A cascade pump with inlet and outlet ports in the same plane and a radial type self-bearing motor are used to reduce the axial thickness of the device. The radial position of a levitated impeller and its rotation are actively controlled by the radial type self-bearing motor. Axial position and tilt motion are stabilized passively with self-restoring permanent magnets. Motion of the levitated impeller is measured by using two eddy current sensors, and three laser displacement sensors are used to evaluate the motion. Transient computational fluid dynamics analysis was conducted to estimate the hydrodynamic force on the levitated impeller. The motion of the levitated impeller is small in comparison with the range of motion. Estimated hydrodynamic force is also small. It was confirmed that device levitation did not fail due to hydrodynamic force. The axial position and tilt motion of the levitated impeller are adequately supported in passive stability.</p>

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