Horikawa Oswaldo, de Andrade Aron José Pazin, da Silva Isaías, Bock Eduardo Guy Perpetuo
Department of Mechatronics Engineering, Escola Politécnica of São Paulo University, EPUSP-PMR, São Paulo, Brazil.
Artif Organs. 2008 Apr;32(4):334-41. doi: 10.1111/j.1525-1594.2008.00551.x.
This work presents results of preliminary studies concerning application of magnetic bearing in a ventricular assist device (VAD) being developed by Dante Pazzanese Institute of Cardiology-IDPC (São Paulo, Brazil). The VAD-IDPC has a novel architecture that distinguishes from other known VADs. In this, the rotor has a conical geometry with spiral impellers, showing characteristics that are intermediate between a centrifugal VAD and an axial VAD. The effectiveness of this new type of blood pumping principle was showed by tests and by using it in heart surgery for external blood circulation. However, the developed VAD uses a combination of ball bearings and mechanical seals, limiting the life for some 10 h, making impossible its long-term use or its use as an implantable VAD. As a part of development of an implantable VAD, this work aims at the replacement of ball bearings by a magnetic bearing. The most important magnetic bearing principles are studied and the magnetic bearing developed by Escola Politécnica of São Paulo University (EPUSP-MB) is elected because of its very simple architecture. Besides presenting the principle of the EPUSP-MB, this work presents one possible alternative for applying the EPUSP-MB in the IDPC-VAD.
这项工作展示了关于磁轴承在由巴西圣保罗但丁·帕扎内塞心脏病学研究所（IDPC）研发的心室辅助装置（VAD）中的应用的初步研究结果。IDPC-VAD具有一种与其他已知VAD不同的新颖架构。在该架构中，转子具有带螺旋叶轮的锥形几何形状，呈现出介于离心式VAD和轴流式VAD之间的特性。通过测试以及在心脏手术中用于体外血液循环，证明了这种新型血液泵送原理的有效性。然而，已研发的VAD使用了滚珠轴承和机械密封的组合，将其使用寿命限制在约10小时，这使得其无法长期使用或用作植入式VAD。作为植入式VAD研发的一部分，这项工作旨在用磁轴承取代滚珠轴承。研究了最重要的磁轴承原理，并选用了圣保罗大学理工学院研发的磁轴承（EPUSP-MB），因其架构非常简单。除了介绍EPUSP-MB的原理外，这项工作还展示了将EPUSP-MB应用于IDPC-VAD的一种可能方案。
