In Vitro and Vivo Evaluation of Tongxin LVAD
Background Tongxin left ventricular assist device (LVAD),an implantable magnetic suspending VAD developed in Chinaheart Biomedical Incorporation aiming for clinical use,weighs about 350g and can deliver 6 L/min for pressures of 145 mm Hg at 2,500 rpm.Objective This study aimed to investigate the implantation possibility,hemolysis and hemocompatibility of the LVAD before clinic use.Methods The tests of implantation possibility,hemolysis and hemocompatibility to the LVAD were completed by fitting study,hemolysis test and in vivo experiments respectively.Meanwhile the hemolysis was evaluated by the amount of free hemoglobin in plasma and studied using the normalized index of hemolysis (NIH).Results The fitting study showed that the blood pump could be implanted in the sheep heart chambers without squeezing the surrounding organs by comparing the preoperative and the postoperative chest X-ray.the NIH value of Tongxin LVAD was 0.0075±0.0017g/100L in vitro hemolysis test.Two sheep in vivo experiments showed the hemolysis in vivo was below 7.5 mg/dL.Hematologic and biochemical test results were within normal limits during the study period.There were no significant complications.Postmortem examination of the explanted organs revealed no evidence of microemboli,ischemia or infarction.The pump’s inflow and outflow conduits were free of thrombus.Conclusions These results indicated that the implantable magnetic suspending LVAD showed exceptional implantation possibility,hemolysis and hemocompatibility,which are crucial to the clinical success of this implantable LVAD..
ventricular assist device magnetic suspending blood pump implantation possibility hemocompatibility in vivo experiment.
C.Y. Lin G.H. Wu X.T. Hou H.Y. Li X.J. Liu C.Y. Xu J.Wang C.Chen
Biomedical engineering department, Capital University of Medical Sciences,Beijing Anzhen Hospital, B China Heart Biomedical Incorporation,Suzhou, Jiangsu Province 215125, China
国际会议
World Congress on Medical Physics and Biomedical Engineering (2012年医学物理及生物医学工程国际会议(IFMBE))
北京
英文
63-66
2012-05-26（万方平台首次上网日期，不代表论文的发表时间）