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Sensorless Controlling Method for a Continuous Flow Left Ventricular Assist Device
Author(s) -
Oshikawa M.,
Araki K.,
Endo G.,
Anai H.,
Sato M.
Publication year - 2000
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.2000.06585.x
Subject(s) - preload , afterload , contractility , cardiology , medicine , ventricular pressure , ventricular assist device , diastole , biomedical engineering , hemodynamics , heart failure , blood pressure
We originated a novel control strategy for a continuous flow left ventricular assist device (LVAD). We examined our method by acute animal experiments to change the left ventricular (LV) contractility or LV end‐diastolic pressure (LVEDP). To estimate the pump pulsatility without any specific sensor, we calculated the index of current amplitude (ICA) from motor current waveform. The ICA had a peak point (t‐i point) that corresponded closely with the turning point from partial to total assistance, and a trough (s‐i point) that corresponded with the beginning point of ventricular collapse. The pump flow at the t‐i point (Qt‐i) had no component of flow regurgitation. In the evaluation of the effects of preload LVEDP, afterload (mAoP), and contractility (max LV dp/dt), we found that preload was the only parameter that significantly influenced Qt‐i. We concluded that our method could well control continuous flow LVAD by preventing reversed flow and ventricular collapse.