20318 非接触型小型軸流式血液ポンプの研究 : ふれまわり運動を有する羽根車に作用する流体力の推定(人工臓器と医用工学(4),OS.8 人工臓器と医用工学)

概要

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A magnetic or fluid suspension prevents the rotating impeller from contacting the internal surfaces of the pump and reduces regions of stagnant and high shear flow that surround mechanical bearings. In the present study, fluid forces acting on the impeller were examined during eccentric excursions of the impeller. In consideration of the suspension design, the fluid forces exerted on the rotor were estimated using an experimental system in which fluid perturbations would be counterbalanced. The eccentric impeller positions were implemented by shifting the impeller/rotor axis with the ranges of eccentric value of 0.0, 0.3 and 0.4mm.The estimation of fluid forces revealed that the larger the eccentric values of the impeller position, the larger the force on the impeller. The maximum radial fluid force was found to be approximately 1.22N. When the eccentric values of the impeller increased, hydraulic characteristics improved with the maximum increase in performance value of approximately 22%.The result of this study is useful in design of a compact, efficient, bio-compatible, mechanically non-contact magnetically or hydrodynamically levitated rotary blood pumps to support circulation of pediatric patients.
社団法人日本機械学会の論文
2009-03-05