Development of a pivot bearing supported sealless centrifugal pump for ventricular assist

Tadashi Nakazawa, Kenzo Makinouchi, Yasuhisa Ohara, Satoshi Ohtsubo, Koji Kawahito, Kimitaka Tasai, Takatugu Shimono, Robert Benkowski, George Damm, Yoshiyuki Takami, Julie Glueck, George P. Noon, Yukihiko Nosé

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Abstract

Since 1991, in our laboratory, a pivot bearing-supported, sealless, centrifugal pump has been developed as an implantable ventricular assist device (VAD). For this application, the configuration of the total pump system should be relatively small. The C1E3 pump developed for this purpose was anatomically compatible with the small-sized patient population. To evaluate antithrombogenicity, ex vivo 2-week screening studies were conducted instead of studies involving an intracorporeally implanted VADs using calves. Five paracorporeal LVAD studies were performed using calves for longer than 2 weeks. The activated clotting time (ACT) was maintained at approximately 250 s using heparin. All of the devices demonstrated trouble-free performances over 2 weeks. Among these 5 studies, 3 implantations were subjected to 1-month system validation studies. There were no device-induced thrombus formations inside the pump housing, and plasma-free hemoglobin levels in calves were within the normal range throughout the experiment (35, 34, and 31 days). There were no incidents of system malfunction. Subsequently, the mass production model was fabricated and yielded a normalized index of hemolysis of 0.0014, which was comparable to that of clinically available pumps. The wear life of the impeller bearings was estimated at longer than 8 years. In the next series of in vivo studies, an implantable model of the C1E3 pump will be fabricated for longer term implantation. The pump-actuator will be implanted inside the body; thus the design calls for substituting plastic for metallic parts.

Original languageEnglish
Pages (from-to)485-490
Number of pages6
JournalArtificial Organs
Volume20
Issue number5
DOIs
Publication statusPublished - 01-01-1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Medicine (miscellaneous)
  • Biomaterials
  • Biomedical Engineering

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  • Cite this

    Nakazawa, T., Makinouchi, K., Ohara, Y., Ohtsubo, S., Kawahito, K., Tasai, K., Shimono, T., Benkowski, R., Damm, G., Takami, Y., Glueck, J., Noon, G. P., & Nosé, Y. (1996). Development of a pivot bearing supported sealless centrifugal pump for ventricular assist. Artificial Organs, 20(5), 485-490. https://doi.org/10.1111/j.1525-1594.1996.tb04469.x