Artif. organs; 44(8): 779-784, Aug. 2020. ilus., graf.
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| SES-SP, SES SP - Instituto Dante Pazzanese de Cardiologia, SES-SP | ID: biblio-1121430
This study presents an assessment for longterm use of the apical aortic blood pump (AABP), focusing on wear reduction in the bearing system. AABP is a centrifugal left ventricle assist device initially developed for bridge to transplant application. To analyze AABP performance in longterm applications, a durability test was performed. This test indicated that wear in the lower bearing pivot causes device failure in longterm. A wear test in the bearing system was conducted to demonstrate the correlation of the load in the bearing system with wear. Results from the wear test showed a direct correlation between load and wear at the lower bearing pivot. In order to reduce load, thus reducing wear, a new stator topology has been proposed. In this topology, a radial stator would replace the axial stator previously used. Another durability test with the new stator has accounted twice the time without failure when compared with the original model.