リニア振動アクチュエータ駆動による電磁式補助人工心臓の開発

概要

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The main purpose of this study is to develop a new direct electromagnetic ventricular assist device(DEM-VAD)with a linear oscillatory actuator(LOA). The DEM-VAD is a pulsatile pump with a pusher-plate, and the pusher-plate is driven directly by the mover of the LOA. The LOA provides the back-and-forth motion required for the basic operation of the VAD without using any movement converter such as a roller screw or a hydraulic system. To drive the VAD in the systolic phase, a large force is necessary. However, a small force is sufficient to drive VAD in the diastolic phase. The principal feature of our LOA is the non-symmetrical thrust characteristics that result from the unique structure of the stator-yoke. The pump housings have been designed using three-dimensional computer aided design software and fabricated with the aid of computer aided manufacturing technology. The DEM-VAD is 101mm in diameter and 47mm thick with a mass of 0.77kg and a volume of 300mL. An in vitro test(afterload 100mm Hg; preload 15mmHg; input power 9.2W)demonstrated 7.3L/min maximum output and 20.6%maximum efficiency at 190(180)bpm.
2003-10-15