Development and initial performance of a miniature axial flow blood pump using magnetic fluid shaft seal
Development and initial performance of a miniature axial flow blood pump using magnetic fluid shaft seal
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DOI：
10.1007/s10047-022-01330-7
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发表时间：
2022-04-15
影响因子：
1.3
通讯作者：
Mitamura, Yoshinori
中科院分区：
文献类型：
--
作者：
Okamoto, Eiji;Yano, Tetsuya;Mitamura, Yoshinori
在这项研究中，我们开发了一种新的导管安装微型轴流式血泵（MFBP）使用一种新的微型磁流体轴封（MFSS）。导管安装的MFBP的原型具有8 mm的最大直径和50 mm的长度。新的MFSS由钕磁环、铁环和专为MFSS设计的磁性流体组成。新的MFSS的外径和内径分别为4.0 mm和2.6 mm，长度为3.0 mm。使用FEM（有限元法）结果计算出MFSS的密封压力为432 mmHg;因此，MFSS具有足够的密封压力用于导管安装的MFBP。磁悬浮轴承的摩擦损耗包括磁流体粘性引起的摩擦和磁环与环形磁铁之间的磁力。在22，000 - 35，000 rpm的泵运行速度范围内，MFSS的总摩擦损失为0.08-0.09 W。从体外实验结果来看，使用MFSS的导管安装式MFBP在60 mmHg的压差下具有3 L/min的泵输出，并且MFBP的泵特性几乎与Impella 5.0的泵特性相同。
In this study, we developed a new catheter-mounted micro-axial flow blood pump (MFBP) using a new miniature magnetic fluid shaft seal (MFSS). The prototype of the catheter-mounted MFBP had a maximum diameter of 8 mm and a length of 50 mm. The new MFSS composed a neodymium magnet ring, an iron ring, and a magnetic fluid particularly designed for the MFSS. The new MFSS had outer and inner diameters of 4.0 mm and 2.6 mm, respectively, and a length of 3.0 mm. The sealing pressure of the MFSS was calculated to be 432 mmHg using FEM (Finite Element Method) result; therefore, the MFSS had sufficient sealing pressure for the catheter-mounted MFBP. The friction loss of the MFSS included the friction owing to the viscosity of the magnetic fluid and the magnetic force between the iron ring and ring magnet. The total friction loss of the MFSS was 0.08-0.09 W in the pump operational speed range from 22,000 to 35,000 rpm. From the in vitro experimental results, the catheter-mounted MFBP using the MFSS had a pump output of 3 L/min. against a differential pressure of 60 mmHg, and the pump characteristics of the MFBP were almost the same as those of Impella 5.0.