Ripple reduction control of the undulation pump total artificial heart

Itsuro Saito, Tsuneo Chinzei, Shuichi Mochizuki, Yusuke Abe, Takashi Isoyama, Kiyotaka Iwasaki, Takafumi Suzuki, Tatsuro Karita, Toshiya Ono, Akimasa Kouno, Mitsuhiko Ishimaru, Atsushi Baba, Toshinaga Ozeki, Takahiro Tohyama, Shin Ichi Kobayashi, Kou Imachi

Research output: Contribution to journalArticlepeer-review

Abstract

An undulation pump total artificial heart (UPTAH) in which the revolutions of the motor are converted to undulation motion of a disk has been developed. In an experiment, a goat using the UPTAH survived for 54 days. However, a large ripple was observed in the device's output pressure and flow waveform. In calculating the spectrum of the ripple, we found that the ripple mainly comprised 2 frequency sine waves: 1 having the same frequency as and 1 having double the frequency of the motor revolutions. To reduce the ripple, 2 sine waves, 1 having the same frequency as and 1 having double the frequency of the motor revolutions, were provided to the motor current to modulate the pulse width of the pulse width modulation controlling the motor revolutions. This ripple control method reduced the pressure ripple by 90% in a mock circulation and by 70% in animal experiments. These results revealed that the ripple generated in the UPTAH could be controlled through the use of motor control software.

Original languageEnglish
Pages (from-to)40-44
Number of pages5
JournalArtificial Organs
Volume26
Issue number1
DOIs
Publication statusPublished - 2002 Mar 25

Keywords

  • Ripple reduction control
  • Total artificial heart
  • Undulation pump

ASJC Scopus subject areas

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

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