Evaluation of the appropriate cool-seal system settings in EVAHEART<sup>®</sup> blood pump shutdown-restart events

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  • Tanaka Yuma
    Department of Clinical Engineering, Osaka University Hospital
  • Nakamura Yuki
    Department of Clinical Engineering, Osaka University Hospital
  • Minematsu Yusuke
    Department of Clinical Engineering, Osaka University Hospital
  • Kusumoto Shigetaka
    Department of Clinical Engineering, Osaka University Hospital
  • Yoshida Kiyoshi
    ‌大阪大学大学院　医学系研究科保健学専攻　未来医療寄附講座 ‌滋慶医療科学大学　医療科学部　臨床工学科
  • Takashina Masaki
    Department of Clinical Engineering, Osaka University Hospital

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Other Title
  • EVAHEART<sup>®</sup>の血液ポンプ停止再起動事象におけるクールシールシステムの適切な設定方法の実験的検討

Abstract

<p>Methods to improve the EVAHEART® blood pump stop-restart event include increasing the filter outlet pressure （FPout） of the cool-seal unit （CSU）, increasing the pressure in the CSU reservoir （pressurized supplementary fluid）, and installing a pressure-boosting clip. The effects of these methods on the sliding surface pressure were investigated to determine the appropriate setting method.</p><p>A simulated pump cable and a manometer were connected to the CSU, and the sliding surface pressure was measured when changing the FPout and CSspeed while installing the pressurized supplementary fluid liquid and the pressure-boosting clip （metal and plastic clips）. We also measured the change in the sliding surface pressure with the decrease in the cool-seal liquid when installing the pressurized supplementary fluid liquid and the metal clip. Consequently, the sliding surface pressure increased linearly with the decrease in CSspeed in the pressurized supplemental fluid and metal clips. For the plastic clip, the sliding surface pressure increased exponentially with each tightening of the clip ratchet. The sliding surface pressure decreased with the decrease in cool-seal liquid in the pressurized supplementary fluid liquid, but remained constant in the metal clip case. These results indicate that it is helpful to set the target value of CSspeed by increasing the FPout and pressurized rehydration and adjusting the CSspeed using the metal clip.</p>

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