Development of the crank-motor vibrating flow pump for the left ventricular assist system

S. Kobayashi, K. Imachi, Y. Abe, T. Isoyama, S. Nitta, T. Yambe

Research output: Contribution to journalArticlepeer-review


A new type of crank-motor actuator was used to improve the vibrating flow pump (VFP). The linear-motor actuator has the advantage of a flexible driving frequency and driving stroke, but it makes the total system heavy due to its low driving force within the target frequency (∼10-40 Hz). The crank-motor structure has an advantage in that it enables an effective driving force within the target frequency, but it has a linear relationship between driving frequency and pumping output because of the fixed stroke of the crank. This linear relationship restricts the driving conditions. The newly designed crank-motor VFP is developed as a left ventricular assist system. It's driving condition was scheduled as 100 mm Hg/5 L min-1/∼20-25 Hz. A study determined that a driving stroke of 5 mm and a diameter of 10 mm were needed to drive the vibrating central tube. The trial crank-motor VFP was made to these specifications. The new VFP is 100 × 50 × 72 mm (L × W × H) and weighs 320 g. This pump almost satisfied the required pumping performance for left ventricular assistance. The new type crank-motor VFP may become a good pump with careful revision of its design and may be used in experiments for the studies of oscillated blood flow and impedance of the circulatory system.

Original languageEnglish
Pages (from-to)351-353
Number of pages3
JournalJournal of Congestive Heart Failure and Circulatory Support
Issue number4
Publication statusPublished - 2000
Externally publishedYes


  • Crank-motor actuator
  • Left ventricular assistance
  • Oscillated blood flow
  • Vibrating flow pump

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Cardiology and Cardiovascular Medicine


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