Indirect flow rate estimation of the NEDO PI gyro pump for chronic BVAD experiments

Daisuke Ogawa, Makoto Yoshizawa, Akira Tanaka, Ken Ichi Abe, Paul Olegario, Tadashi Motomura, Hisashi Okubo, Takeshi Oda, Toshiya Okahisa, Stephen R. Igo, Yukihiko Nosé

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In totally implantable ventricular assist device systems, measuring flow rate of the pump is necessary to ensure proper operation of the pump in response to the recipient's condition or pump malfunction. To avoid problems associated with the use of flow probes, several methods for estimating flow rate of a rotary blood pump used as a ventricular assist device have been studied. In the present study, we have performed a chronic animal experiment with two NEDO PI gyro pumps as the biventricular assist device for 63 days to evaluate our estimation method by comparing the estimated flow rate with the measured one every 2 days. Up to 15 days after identification of the parameters, our estimations were accurate. Errors increased during postoperation days 20 to 30. Meanwhile, their correlation coefficient r was higher than 0.9 in all the acquired data, and estimated flow rate could simulate the profile of the measured one.

Original languageEnglish
Pages (from-to)266-271
Number of pages6
JournalASAIO Journal
Issue number3
Publication statusPublished - 2006 May

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering


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