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In vivo biocompatibility evaluation of a new resilient, hard-carbon, thin-film coating for ventricular assist devices.

机译:一种新的用于心室辅助装置的弹性硬碳薄膜涂层的体内生物相容性评估。

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摘要

The purpose of this study was to evaluate in vivo the biocompatibility of BioMedFlex (BMF), a new resilient, hard-carbon, thin-film coating, as a blood journal bearing material in Cleveland Heart's (Charlotte, NC, USA) continuous-flow right and left ventricular assist devices (RVADs and LVADs). BMF was applied to RVAD rotating assemblies or both rotating and stator assemblies in three chronic bovine studies. In one case, an LVAD with a BMF-coated stator was also implanted. Cases 1 and 3 were electively terminated at 18 and 29 days, respectively, with average measured pump flows of 4.9 L/min (RVAD) in Case 1 and 5.7 L/min (RVAD) plus 5.7 L/min (LVAD) in Case 3. Case 2 was terminated prematurely after 9 days because of sepsis. The sepsis, combined with running the pump at minimum speed (2000 rpm), presented a worst-case biocompatibility challenge. Postexplant evaluation of the blood-contacting journal bearing surfaces showed no biologic deposition in any of the four pumps. Thrombus inside the RVAD inlet cannula in Case 3 is believed to be the origin of a nonadherent thrombus wrapped around one of the primary impeller blades. In conclusion, we demonstrated that BMF coatings can provide good biocompatibility in the journal bearing for ventricular assist devices.
机译:这项研究的目的是评估BioMedFlex(BMF)的生物相容性,BioMedFlex(BMF)是一种新的有弹性,硬碳的薄膜涂层,可作为克利夫兰心脏(美国北卡罗来纳州夏洛特)连续流的血液日记材料。左右心室辅助设备(RVAD和LVAD)。在三个长期的牛研究中,BMF被应用于RVAD旋转组件或旋转组件和定子组件。在一种情况下,还植入了带有BMF涂层定子的LVAD。情况1和3分别在第18天和第29天被终止,情况1的平均测量泵流量为4.9 L / min(RVAD),情况为3.7 L / min(RVAD)加情况下为5.7 L / min(LVAD)。案例2因败血症在9天后过早终止。败血症结合以最低速度(2000 rpm)运行泵,提出了最坏情况下的生物相容性挑战。血液接触的轴颈轴承表面的植入后评估显示,四个泵中的任何一个都没有生物沉积。在案例3中,RVAD入口套管内的血栓被认为是缠绕在主叶轮叶片之一上的不粘连血栓的起源。总之,我们证明BMF涂层可以在心室辅助设备的轴颈轴承中提供良好的生物相容性。

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