Suction detection on an axial blood pump using BEMF data
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United States of America Patent
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Nov 15, 2016
Grant Date -
Apr 10, 2014
app pub date -
Jul 25, 2013
filing date -
Jan 21, 2011
priority date (Note) -
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Abstract
The presence or absence of a suction condition in an implantable blood pump is determined at least in part based on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. A local extreme of the parameter representing the minimum flow during ventricular diastole in an earlier interval is used to establish a threshold value. A value of the parameter representing the minimum flow during ventricular diastole in a later interval is compared to this threshold. If the comparison indicates a substantial decline in the minimum flow between the earlier and later intervals is associated with a suction condition. During the absence of a suction condition, the threshold is continually updated, so that the system does not indicate presence of a suction condition if the flow decreases gradually.
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