新型左心辅助装置动力性主动脉瓣的探索性研究

Preliminary Study of a New Concept for Left Veniricular Assistance Dynamic Aortic Valve

提出左心机械辅助的一种新设想动力性主动脉瓣，在主动脉瓣的位置设置一可主动旋转的螺旋桨式机械性瓣叶（叶轮）。瓣叶由置于升主动脉腔内的支架笼中心的一对轴承支承。支架笼通过其外周的编织瓣裙与主动脉瓣环缝合固定。笼内有可自由旋转的转子体，笼架支承主动脉壁从而防止转子与动脉壁接触。转子体与旋转瓣叶通过一共同轴联接并传递动力。将筒状的定子置于主动脉壁外，其功能与普通的电机相同。当接通电源时，定子产生的磁场将驱动叶轮转子体旋转推动血液由心室进入主动脉，达到心室卸负荷的目的。本文对该设想进行了模型研究，结果表明原理正确可行，有必要进一步探索。

Dynamic aortic valve, a novel design for left ventricular assistance is proposed. An impeller similar to the airscrew is placed in the position of aortic valve. The impeller is held by a pair of bearings in the center of a cylindrical supporting cage which is located in the lumen of the aorta ascendens. The supporting cage is attached to the valve annulus by a sewing ring of textile cuff around the outside of the cage. A rotor is fitted into the cage and connected to the impeller with a common shaft. The cage supports the aortic wall,thus prevents the rotor from fouching the wall and allows the rotor to rotate freely. A stator, functioning as that of the electric motor, is located outside the aortic wall. When actuated, the magnetic field generated by the stator would drive the rotor to turning, and the axial flow of blood from ventricular to the aorta would be produced, resulting in the reduction of the ventricular load. We studied this concept in a simulating model. The result suggests that this design be reasonable. Further exploration of this concept is justified.