title: Ripple reduction control of the undulation pump total artificial heart.
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.
authors.affiliation: Research Center for Advanced Science and Technology, Tokyo, Japan. saito@bme.rcast.u-tokyo.ac.jp
authors.forename: Itsuro
authors.initials: I
authors.lastname: Saito
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Chinzei
authors.forename: Shuichi
authors.initials: S
authors.lastname: Mochizuki
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Abe
authors.forename: Takashi
authors.initials: T
authors.lastname: Isoyama
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Iwasaki
authors.forename: Takafumi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Karita
authors.forename: Toshiya
authors.initials: T
authors.lastname: Ono
authors.forename: Akimasa
authors.initials: A
authors.lastname: Kouno
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Ishimaru
authors.forename: Atsushi
authors.initials: A
authors.lastname: Baba
authors.forename: Toshinaga
authors.initials: T
authors.lastname: Ozeki
authors.forename: Takahiro
authors.initials: T
authors.lastname: Tohyama
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Kobayashi Si
authors.forename: Kou
authors.initials: K
authors.lastname: Imachi
mesh_terms: D000818:Animals; D006041:Goats; D006354:Heart, Artificial; D011673:Pulsatile Flow; D012399:Rotation