Key result
Animal experiments up to 90 days revealed no noticeable depth increase in the top female bearing of the NEDO Gyro PI-710 centrifugal pump, with an estimated in vitro life of 3 to 7 years.
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The pivot bearings of the NEDO Gyro PI-710 centrifugal blood pump showed durability in animal models up to 90 days and an estimated lifespan of 3 to 7 years in vitro.
The NEDO Gyro PI-710 centrifugal pump (Gyro PI-710 pump) incorporates a double pivot bearing system of which the male pivot and female bearings are fabricated from Al2O3 ceramic and ultrahigh molecular weight polyethylene. The top female bearing is a critical component because the impeller is levitated by hydraulic force and is maintained in the top contact position. A long-term in vitro examination of the pivot bearings was conducted using a biventricular assist model. In 7 animal experiments, the depth change of the top female bearing was examined. Animal experiments up to 90 days revealed that there was no noticeable depth increase in the top female bearing. According to the in vitro study, the life of the pivot bearings of the left and right pump was estimated to be approximately 3 and 7 years, respectively. Further improvement of this pivot bearing system is currently underway.
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Asai et al. (2004) studied this question. NEDO Gyro PI-710 centrifugal pump was evaluated on Depth change of the top female bearing and estimated life of the pivot bearings. Animal experiments up to 90 days revealed no noticeable depth increase in the top female bearing of the NEDO Gyro PI-710 centrifugal pump, with an estimated in vitro life of 3 to 7 years.
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