论文部分内容阅读
目的提出一种磁耦合驱动搏动式血泵结构并验证其可行性。方法基于磁场传递往复作用力模型以及推拉互挽式结构设计磁耦合驱动搏动血泵,通过建立磁力驱动模型,计算耦合力大小,制作样机并对样机进行体外循环模拟试验,获得压力和流量实验数据。结果采用生理盐水作为循环介质,固定后负荷,增加前负荷,血泵输出量减少,没有明显线性趋势;固定前负荷,增加后负荷,血泵输出量减少,且具有一定线性趋势。设置驱动频率为75次/min时,调节前、后负荷改变范围分别为0.665~3.990 k Pa(5~30 mm Hg)和5.320~11.970 k Pa(5~30 mm Hg),可使输出量在保证线性关系条件下达到2.0~3.1 L/min。结论该搏动式血泵流体力学特性基本满足体外膜肺循环的需要,仍需进一步研究和改进;研究结果具有重要的应用前景,尤其对替代目前临床体外膜肺氧合设备的血泵装置具有重要意义。
Objective To propose a magnetic coupling drive pulse pump structure and verify its feasibility. Methods Based on the magnetic field reciprocating force model and the magnetic coupling driven pulsatile blood pump with the push-pull and pull-pull structure design, the magnetic force driving model was established to calculate the coupling force. The prototype was made and simulated by extracorporeal circulation to obtain the experimental data of pressure and flow . Results With normal saline as the circulating medium, the postload was fixed, the preload was increased, and the output of blood pump was decreased. There was no obvious linear trend. The pre-fixation load, post-load increase and blood pump output decreased with a certain linear trend. When the driving frequency is 75 times / min, the load range before and after adjustment is 0.665 ~ 3.990 kPa (5 ~ 30 mm Hg) and 5.320 ~ 11.970 kPa (5 ~ 30 mm Hg), respectively, To ensure that the linear relationship to reach 2.0 ~ 3.1 L / min. Conclusion The pulsatile blood pump fluid mechanics basically meets the requirement of extracorporeal membrane pulmonary circulation, which needs further study and improvement. The results of the study have important application prospects, especially for the replacement of blood pump devices in clinical extracorporeal membrane oxygen device .