Japanese Journal of Extra-Corporeal Technology

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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.

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.

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