Novel connecting conduit-free and bypass circuit-less mini LVADs for reducing thrombosis risk
All existing left ventricular assist devices(LVADs) need inlet and outlet connecting conduits and the assist pumping blood flows through the bypass circuit from left ventricle to aorta. It will result in some most likely sites of thrombosis and brings about physiological disturbance to natural circulation, as well as additional need for anatomic occupation in chest. The author developed a trans-apical and cross-valvular intra-ventricular axial pump and an aortic valvo-pump to solve these problems. The intra-ventricular pump weighing 53g has a length of 115mm and its largest O.D. is 13mm. The motor is 60mm long and the pump 55mm. In both sides of motor, special designed needle bearings are devised and a purge system keeps the motor together with bearings working in saline. The device is inserted into the ventricle by trans-apex and then into the aorta by cross-valve. It is used for recovery therapy. The bearing-less valvo-pump has an outer diameter of 21mm, 23mm or 25mm for patients with different body weights. The weight of the device is 27g, 31g or 40g respectively. Used for destination therapy it can be easily sewed onto the aortic valve annulus, delivers blood from ventricle to aorta directly. These two novel mini LVADs may reduce thrombosis risk in clinical applications.
mini LVADs physiological disturbance anatomic occupation recovery or destination therapies
Kun-xi Qian Teng Jing
Institute of BME Jiangsu University. Zhen-jiang, China,212013 Institute of BME Jiangsu University Zhen-jiang, China,212013
国际会议
上海
英文
1326-1328
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）