Hematocrit measurement - a high precision on-line measurement system based on impedance spectroscopy for use in hemodialysis machines

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Authors
Trebbels, Dennis
Zengerle, Roland
Author (Corporation)
Publication date
2009
Typ of student thesis
Course of study
Type
04B - Conference paper
Editors
Editor (Corporation)
Supervisor
Parent work
IFMBE Proceedings
Special issue
DOI of the original publication
Link
Series
Series number
Volume
25/7
Issue / Number
Pages / Duration
247-250
Patent number
Publisher / Publishing institution
Place of publication / Event location
München
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
This paper presents a unique technical approach to measure the proportion of blood volume occupied by red blood cells, the hematocrit value (HCT) on-line and in-line. A practical method has been developed to measure without the need for extracting blood samples out of an existing extracorporeal blood circulation system. The new sensor is based on Impedance Spectroscopy and measures electrical properties of the blood at various frequencies. In order to achieve the required precision resolution the sensor geometry has been optimized by Finite Element Analysis. For sensor readout a digital measurement circuitry based on cheap standard components is developed and allows practical implementation of HCT-sensor devices for the first time. Special care has been taken in order to compensate for the temperature effects.
Keywords
impedance spectroscopy, on-line measurement, hematocrit measurement, hemodialysis, extracor- poral blood flow
Subject (DDC)
600 - Technik, Medizin, angewandte Wissenschaften
Project
Event
World Congress on Medical Physics and Biomedical Engineering
Exhibition start date
Exhibition end date
Conference start date
07.09.2009
Conference end date
12.07.2009
Date of the last check
ISBN
9783642038846
9783642038853
ISSN
1680-0737
1433-9277
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
Citation
TREBBELS, Dennis, Roland ZENGERLE und David HRADETZKY, 2009. Hematocrit measurement - a high precision on-line measurement system based on impedance spectroscopy for use in hemodialysis machines. In: IFMBE Proceedings. München. 2009. S. 247–250. ISBN 9783642038846. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46725