Microlab
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STAR User Manual
Page 22 of 225 610766/02
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In addition to pressure-based clot detection, the ML STAR is equipped with capacitance-
based clot detection, too. This detection approach works for an aspiration with capacitance
liquid level detection switched on. The system measures the conductive signal when the tip
leaves the liquid after aspiration. Due to the air gap between tip and liquid, the capacitance
signal will vanish once a given height is reached (the “clot retract height”, which is specified
within the liquid class). If a clot is present, it bridges the distance and the signal will remain,
resulting in an error message. A typical clot retract height is 2-5 mm. This is illustrated below.
This clot detection is independent of pressure-based monitoring.
Clot Retract Height
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