Takami Y, Nakazawa T, Makinouchi K, Benkowski R, Glueck J, Nosé Y
Department of Surgery, Baylor College of Medicine, Houston, Texas 77030, USA.
Artif Organs. 1997 Feb;21(2):143-7. doi: 10.1111/j.1525-1594.1997.tb00351.x.
A double pivot bearing system is adopted for the Gyro C1E3 centrifugal blood pump to achieve a completely sealless structure that prevents blood leakage and thrombus formation around the shaft. The double pivot bearing system is also a critical factor for blood trauma and durability of the C1E3 pump. This study focuses on the double pivot bearing material. The pump with the male ceramic and female polyethylene pivots (PE) was compared with the pump with the male ceramic and female ceramic pivots (CRM), pertaining to stability of the impeller spinning motion, hemolysis, and durability. At first, the wear rate of the pivots was recorded after operating the pumps in various rotational speeds. As for hemolysis, in vitro tests were carried out using fresh bovine blood in 2 conditions (5 L/min, 350 mm Hg and 5 L/min, 100 mm Hg). Then, stability of the spinning motion was investigated by evaluating the vibration of the pump. The two pumps with different female pivots were operated identically at 2,700 rpm, and the vibration signals were measured using an accelerometer that was mounted on the top of the pump housing. The following findings were obtained in this study. The wear sites were different between the PE and CRM. Most of the wear occurred at the top female polyethylene pivot in the PE. In contrast, most of the wear occurred at the top male ceramic pivot in the CRM. In addition, the amount of the initial wear was less and the wear rate was lower in the PE than in the CRM. The hemolysis caused by the PE was less than the hemolysis caused by the CRM. The vibration signals of the PE had less amplitude and a narrower range of frequency than the vibration signals of the CRM. In conclusion, the combination of materials male ceramic-female polyethylene are superior to the male ceramic-female ceramic for the double pivot bearing system of the Gyro C1E3 centrifugal pump because of less vibration, less hemolysis, and less wear.
Gyro C1E3离心血泵采用双枢轴轴承系统，以实现完全无密封结构，防止血液在轴周围泄漏和形成血栓。双枢轴轴承系统也是C1E3泵血液损伤和耐用性的关键因素。本研究聚焦于双枢轴轴承材料。将具有雄性陶瓷和雌性聚乙烯枢轴（PE）的泵与具有雄性陶瓷和雌性陶瓷枢轴（CRM）的泵在叶轮旋转运动稳定性、溶血和耐用性方面进行了比较。首先，在以各种转速运行泵后记录枢轴的磨损率。至于溶血，在两种条件（5升/分钟，350毫米汞柱和5升/分钟，100毫米汞柱）下使用新鲜牛血进行体外测试。然后，通过评估泵的振动来研究旋转运动的稳定性。两个具有不同雌性枢轴的泵在2700转/分钟下以相同方式运行，并使用安装在泵壳顶部的加速度计测量振动信号。本研究获得了以下结果。PE和CRM的磨损部位不同。PE中大部分磨损发生在顶部雌性聚乙烯枢轴处。相比之下，CRM中大部分磨损发生在顶部雄性陶瓷枢轴处。此外，PE的初始磨损量较少且磨损率低于CRM。PE引起的溶血比CRM引起的溶血少。PE的振动信号幅度较小且频率范围比CRM的振动信号窄。总之，对于Gyro C1E3离心泵的双枢轴轴承系统，雄性陶瓷 - 雌性聚乙烯材料组合优于雄性陶瓷 - 雌性陶瓷组合，因为其振动更小、溶血更少且磨损更少。
