Affeld K, Bailleu A, Buss A, Diluweit J, Friedrichsen U, Gadischke J, Hanitsch R, Hetzer R, Huber A, Kähler J
Labor für Biofluidmechanik, Freie Universität, Berlin, Germany.
Artif Organs. 1994 Jul;18(7):479-83. doi: 10.1111/j.1525-1594.1994.tb03363.x.
An energy converting system that can function for years without maintenance is required for the drive of a left ventricular assist device (LVAD). To meet the requirements of safety, the energy converter should have a simple design with few moving elements. The design applied herein has only one moving part and thus has greater inherent safety than competing systems. The only moving part is the rotor unit, comprised of the impeller of a centrifugal pump, the rotor of an electric motor, and the rotor of an electric axial actuator. A reversal of flow of the transmitter fluid can be achieved with an axial shift of this rotor unit. This fluid acts on the outer surface of a blood chamber and enables it to draw in blood and to expel it. Valves direct the flow of blood. The energy converter performs a flow of 12 L/min at a motor speed of 6,000 rpm against a pressure head of 115 mm Hg according to an output of the pulsatile blood pump of 5 L/min.
左心室辅助装置（LVAD）的驱动需要一个无需维护就能运行数年的能量转换系统。为满足安全要求，能量转换器的设计应简单，运动部件少。本文应用的设计只有一个运动部件，因此比竞争系统具有更高的固有安全性。唯一的运动部件是转子单元，它由离心泵的叶轮、电动机的转子和电动轴向致动器的转子组成。通过该转子单元的轴向移动可实现输送流体流动方向的反转。这种流体作用于血腔的外表面，使其能够吸入和排出血液。瓣膜引导血液流动。根据脉动血泵5L/min的输出，能量转换器在电机转速为6000rpm、压头为115mmHg的情况下，流量为12L/min。
