2017 Volume 55Annual Issue 4AM-Abstract Pages 270
An implantable type ventricular assist device becomes mainstream, but an extracorporeal type pump has advantage in case of short term assistance. However, in the case of extracorporeal type device, it is expected that the assist flow is affected by cannula diameter and length. In this study, the influence of diameter and length of the cannula on assist flow was investigated and compensation method by pump control was proposed.The HQ curves combining cannula with pump was obtained. The model expressing HQ curve was identified from measured data and the slope of HQ curve at any drive point was evaluated. In result, although the same assist flow was actualized in small diameter by high pump speed, the slope of HQ curve around driving point became steep. Besides, the result indicated that the steepness was compensated by dynamic rotational speed control such as co-pulse mode control.
