Real-time Studies of the Pivot Bearings in the NEDO Gyro PI-710 Centrifugal Blood Pump

: 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 levi...

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Bibliographic Details
Published in:Artificial organs 2004-10, Vol.28 (10), p.899-903
Main Authors: Asai, Toshimasa, Watanabe, Kuniyoshi, Ito, Seiichi, Tsujimura, Shinichi, Motomura, Tadashi, Shinohara, Toshiyuki, Glueck, Julia A., Nosé, Yukihiko
Format: Article
Language:English
Subjects:
Assisted Circulation - instrumentation
Biomedical Engineering
Blood Circulation
Blood Flow Velocity
Centrifugal pump
Ceramic
Female
Heart, Artificial
Heart-Assist Devices - standards
Humans
Long-term ventricular assist device
Male
Pivot bearing
Time Factors
Ultrahigh molecular weight polyethylene
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Summary:: 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.
ISSN:0160-564X
1525-1594
DOI:10.1111/j.1525-1594.2004.00074.x