Capacitive on-line hematocrit sensor design based on impedance spectroscopy for use in hemodialysis machines
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2009
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04B - Conference paper
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2009 annual international conference of the IEEE engineering in medicine and biology society
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IEEE
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Minneapolis, Minnesota, USA
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Abstract
This paper presents a new design for an on-line
and in-line hematocrit (HCT) sensor. Special feature of the
sensor is the capability to measure the hematocrit of a blood
sample inside standard plastic tubing widely used in medical
equipment. No blood sample has to be extracted out of existing
extracorporeal blood circulation systems such as hemodialysis
machines or heart-lung machines. The sensor principle is based
on electrical impedance spectroscopy. Dielectric properties of
the blood and the plastic tubing are measured at various
frequencies. In order to optimize the sensitivity, a unique
electrode configuration is developed and optimized by Finite
Element Simulation. The new electrode design optimizes the
overall sensitivity of the sensor towards a change in dielectric
properties of the blood caused by the HCT value and therefore
decreases the sensitivity to side effects caused by temperature
drift and component tolerances. As a result of the optimized
overall sensor performance the complexity of a sensor readout
circuitry can be reduced to a minimum which leads to an
unmatched price-performance ratio for a complete measurement
system.
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31st Annual International Conference of the IEEE EMBS
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02.09.2009
Conference end date
06.09.2009
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English
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No
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Published
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Citation
Trebbels, D., Hradetzky, D., & Zengerle, R. (2009). Capacitive on-line hematocrit sensor design based on impedance spectroscopy for use in hemodialysis machines. In IEEE (Ed.), 2009 annual international conference of the IEEE engineering in medicine and biology society. IEEE. https://doi.org/10.1109/iembs.2009.5332420