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Flow visualization of the Baylor/Miwatec centrifugal artificial heart revealed an eccentric vortex and a minimum shear rate around the bottom pivot of 650/s, exceeding the threshold for thrombus formation.
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Flow visualization of the Baylor/Miwatec centrifugal pump demonstrates that its eccentric inlet port generates shear rates sufficient to potentially prevent thrombus formation.
Flow visualization analysis was applied to the Baylor/Miwatec centrifugal artificial heart to evaluate its fluid dynamic characteristics regarding antithrombogenicity. An eccentric vortex was found both in the upper and the lower gaps of the impeller, which is supposed to be caused by the eccentric inlet port. Therefore, one-way flow toward the outlet is formed and washes the pivot. The combination of an eccentric vortex and a pivot bearing that is washed is unique to the Baylor/Miwatec pump. For the male pivots exposed to periodic wash, the minimum shear rate around the bottom pivot was estimated to be 650/s, which is higher than the threshold for thrombus formation shown by other studies. The wall shear rate at the impeller bottom surface was found to be larger in the top contact mode than in the bottom contact mode.
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Yamane et al. (2004) studied this question. Baylor/Miwatec centrifugal artificial heart was evaluated on Fluid dynamic characteristics regarding antithrombogenicity (shear rate). Flow visualization of the Baylor/Miwatec centrifugal artificial heart revealed an eccentric vortex and a minimum shear rate around the bottom pivot of 650/s, exceeding the threshold for thrombus formation.
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