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- W2033945793 abstract "Under development of rotary blood pump LVAD, a controller is one of the major problems. Although clinically LVAD flow is a good indicator for regulating circulatory conditions, rotary blood pump flow changes depending on preload and afterload of the pump. Many investigators try to estimate the pump flow by using motor current. However there are some pitfalls in in-vitro experimental settings. (Materials & Methods) By using a mock loop with a pneumatically driven LV chamber and centrifugal pump as an LVAD, the pump flow and defferential pressure was monitored to evaluate a pump performance curve (HQ curve). (Results) In a pulsatile LV setting, HQ curve showed a loop, but it changed depending on the setting of LV contraction. And this type of LV chamber cannot mimic the Starling phenomenon, so the developed LV pressure does not change according to the preload of LV. (Conclusions) Flow estimation of rotary blood pump is the most effective method for controller. However, at first in pulsatile condition, the HQ curve shows the loop and secondly it changes under various LV contractility. That makes it complicated to get a liner equation for calculating flow. Thirdly, there is a limitation to mimic LV contractility under Starling law. This leads to a misunderstanding of analyzing HQ curve under pulsatile condition. We are now developing a pattern analysis of HQ curve as a flow estimation controller.Figure" @default.
- W2033945793 created "2016-06-24" @default.
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- W2033945793 date "2000-03-01" @default.
- W2033945793 modified "2023-09-25" @default.
- W2033945793 title "PITFALLS OF DEVELOPMENT FOR ROTARY BLOOD PUMP CONTROLLER" @default.
- W2033945793 doi "https://doi.org/10.1097/00002480-200003000-00020" @default.
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