Electrocardiogram and Impedance Pneumography Measurement Module Design for Textile-Integrated Solution
Tuohimäki, Katariina Emilia (2016)
2016
Sähkötekniikan koulutusohjelma
Tieto- ja sähkötekniikan tiedekunta - Faculty of Computing and Electrical Engineering
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Hyväksymispäivämäärä
2016-08-17
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201608014347
https://urn.fi/URN:NBN:fi:tty-201608014347
Tiivistelmä
A wearable electronics is a quickly broadening category in sport, wellbeing and entertainment products. Also a fully textile-integrated electronics is used increasingly to improve the user experience. The medical industry is interested to exploit especially the latter technology for a supported long-term home care. The problem is, there are only wellbeing promoting textile-integrated electronics at the moment. These products recommend for example how to prevent an injury, but do not provide the actual diagnostic value. Purpose of this master´s thesis was to increase knowledge of the biomedical instrumentation about diagnostics textile-integrated electronics – especially designed for long-term home monitoring of the elderly.
For achieving this matter, into shirt integrated an electrocardiography (ECG) and impedance pneumography (IP) measurement module will be developed as a part of the Disappearing Sensors (DISSE) project. Preparation, like technical designing and functionality testing, have been made during this thesis for fulfilling described target. The functionality testing was implemented from three point of views: electrodes, measurement position, and measuring techniques for the ECG and IP. As electrodes were used commercial disposable electrodes, textile electrodes, and printed electrodes. Different measurement positions were laying, sitting, standing and walking slow and fast. As measurement techniques, 2- and 4-electrode measuring methods were compared by using commercial evaluation board. The work also considered a choose of the shirt and its final form in the prototype, which textile-integrated version will be completed during Autumn 2016.
From electrodes the most stable results were gathered with disposal ones. However, the skin irritation caused by these electrodes is not suitable for a long-term monitoring. For the textile and printed electrodes skin irritation did not seem to be a problem. Random instabilities of the textile electrodes were reason why the printed electrodes were chosen to be the best alternative. Measuring positions, excluding walking, fulfilled the minimum goal to detect pulse and breathing. In walking tests heart and respiration rates can be detected, despite occasional errors, only with disposal electrodes. In order to achieve the this with printed electrodes, the skin-electrode-contact should be improved. From two measuring techniques the 4-electrode measuring method had worse signal quality, but pulse and breathing were detected with more accuracy compared to 2-electrode measuring method.
For achieving this matter, into shirt integrated an electrocardiography (ECG) and impedance pneumography (IP) measurement module will be developed as a part of the Disappearing Sensors (DISSE) project. Preparation, like technical designing and functionality testing, have been made during this thesis for fulfilling described target. The functionality testing was implemented from three point of views: electrodes, measurement position, and measuring techniques for the ECG and IP. As electrodes were used commercial disposable electrodes, textile electrodes, and printed electrodes. Different measurement positions were laying, sitting, standing and walking slow and fast. As measurement techniques, 2- and 4-electrode measuring methods were compared by using commercial evaluation board. The work also considered a choose of the shirt and its final form in the prototype, which textile-integrated version will be completed during Autumn 2016.
From electrodes the most stable results were gathered with disposal ones. However, the skin irritation caused by these electrodes is not suitable for a long-term monitoring. For the textile and printed electrodes skin irritation did not seem to be a problem. Random instabilities of the textile electrodes were reason why the printed electrodes were chosen to be the best alternative. Measuring positions, excluding walking, fulfilled the minimum goal to detect pulse and breathing. In walking tests heart and respiration rates can be detected, despite occasional errors, only with disposal electrodes. In order to achieve the this with printed electrodes, the skin-electrode-contact should be improved. From two measuring techniques the 4-electrode measuring method had worse signal quality, but pulse and breathing were detected with more accuracy compared to 2-electrode measuring method.