Hydraulic Refinement of An Intraarterial Microaxial Blood Pump
Hydraulic Refinement of An Intraarterial Microaxial Blood Pump
复制标题
动脉内微轴血泵的水力精化
DOI：
10.1177/039139889501800506
复制
发表时间：
1995
影响因子：
1.7
通讯作者：
Günter Rau
中科院分区：
文献类型：
--
作者：
T. Siess;Helmut Reul;Günter Rau
血管内操作的微轴泵已被引入临床，证明是心脏辅助的有用工具 (1-4)。然而，文献中报道了与体外电机和柔性驱动轴电缆相关的许多并发症 (5,6)。本文提出了一种新的泵概念，该概念在开发过程中在机械和液压方面得到了完善。驱动轴电缆已被近端集成的微型电动机和体外电源 (7) 取代。泵和电源之间的导管仅由导管内的电力电缆组成，从而形成一种不受扭结和小曲率半径影响的装置。由于泵外径较大，预计会出现插入困难，因此采用了两步法，即初始 6.4mm 泵版本和辅助 5.4mm 版本。两种泵均满足压差为 80–100mmHg 时至少 2.5I/min 的液压要求。实现预期目标所需的水力改进基于对泵内流动的持续流体动力学研究。 10:1 比例模型以及 1:1 比例泵的流量可视化显着改善了泵的整体水力性能。 6.4mm 泵说明了这种基于流量可视化的几何变化的迭代开发过程的一个例子。
Intravascularly operating microaxial pumps have been introduced clinically proving to be useful tools for cardiac assist (1–4). However, a number of complications have been reported in literature associated with the extra-corporeal motor and the flexible drive shaft cable (5,6). In this paper, a new pump concept is presented which has been mechanically and hydraulically refined during the developing process. The drive shaft cable has been replaced by a proximally integrated micro electric motor and an extra-corporeal power supply (7). The conduit between pump and power supply consists of only an electrical power cable within the catheter resulting in a device which is indifferent to kinking and small curvature radii. Anticipated insertion difficulties, as a result of a large outer pump diameter, led to a two-step approach with an initial 6,4mm pump version and a secondary 5,4mm version. Both pumps meet the hydraulic requirement of at least 2.5I/min at a differential pressure of 80–100mmHg. The hydraulic refinements necessary to achieve the anticipated goal are based on ongoing hydrodynamic studies of the flow inside the pumps. Flow visualization on a 10:1 scale model as well as on 1:1 scale pumps have yielded significant improvements in the overall hydraulic performance of the pumps. One example of this iterative developing process by means of geometrical changes on the basis of flow visualization is illustrated for the 6.4mm pump.