中文摘要：

直接心室辅助通过在心脏外侧柔性挤压心脏，帮助虚弱的心脏恢复功能。它能够避免人工器件与血液接触引发的血栓、血感染等问题，是人工心脏辅助器件研究与开发的重要领域之一。直接心室辅助的致动器，决定了器件的结构、形状、及其性能，是整个辅助器件关键中的关键，致动器上的任何突破有可能对直接心室辅助器件产生革命性影响。因此，本文从致动原理的角度，分析、探讨了直接心室辅助的致动方法及其存在问题，这对探索与开发满足要求的下一代直接心室辅助致动器有一定的帮助作用。

英文摘要：

To assist a weakened or failing heart, direct cardiac assist devices wrap around the epicardial surface and gently squeeze the blood out of the heart. This kind research and development are important because it can avoid thromboembolic events and blood infection, which are common to the current heart assist devices. The actuators determine the structure, shape, and performances of direct cardiac assist devices, and therefore is the key for development. Any breakthrough in the actuator technology could potentially have revolutionary influence on the device development. Therefore, this paper reviews the actuator technologies of direct cardiac assist devices and their problems. These analyses will be helpful for the exploration of next - generation direct cardiac assist devices