Research on 1-DOF controlled magnetically suspended centrifugal pump for implantable artificial kidney

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03841
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18040:Machine elements and tribology-related
• Research Institution: Nippon Institute of Technology
• Principal Investigator: Zhang Xiaoyou 日本工業大学, 基幹工学部, 教授 (30431985)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 磁気軸受 / 遠心ポンプ / 人工腎臓

Outline of Final Research Achievements

In this research, to improve the quality of life of kidney disease patients, a one-degree-of-freedom controlled magnetic bearing for compact centrifugal pumps is developed. The dimensions of the fabricated magnetic bearing are 90mm in diameter, 120mm in height, and its mass is 1.51kg. When the rotor is levitated from an axial displacement of 0.3 mm, the required coil current is 2.5A. The vibration of the rotor is within approximately ±2μm during levitation.
Moreover, to rotate the impeller of the centrifugal pump, a motor is designed. The motor can rotate the rotor up to 2000 rpm. Furthermore, simulations are performed for the flow of blood in the centrifugal pump, and the inlet flow velocity of blood and impeller rotational speed are optimized. When the rotational speed exceeded 2750 rpm and the blood inlet flow velocity is 1.2 m/s, the separation efficiency of blood cell components is about 45%

Free Research Field

工学

Academic Significance and Societal Importance of the Research Achievements

体内に埋込み可能な人口腎臓に応用できる，コンパクトかつ低エネルギー消費型磁気浮上遠心ポンプの実現を目指すことができる．磁気浮上の無摩擦・無摩耗の特徴を生かし，高耐久性および血栓・溶血低減可能な，体内埋込み型人口腎臓の実現を目指せる．
世界中に約200万人以上の腎臓病患者が血液透析治療を受けているが，透析治療に用いる機器は大型であり，システムが複雑である．このため，患者は毎週３回通院し，毎回４時間程度の治療を受けなければならない．体内埋込式磁気浮上人工腎臓の実現により，腎臓病患者の生活の質を劇的に向上することができる．