Portable bioimpedance monitor evaluation for continuous impedance measurements: Towards wearable plethysmography applications
2013 (English)In: Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS, 2013, 559-562 p.Conference paper (Refereed)
Personalised Health Systems (PHS) that could benefit the life quality of the patients as well as decreasing the health care costs for society among other factors are arisen. The purpose of this paper is to study the capabilities of the System-on-Chip Impedance Network Analyser AD5933 performing high speed single frequency continuous bioimpedance measurements. From a theoretical analysis, the minimum continuous impedance estimation time was determined, and the AD5933 with a custom 4-Electrode Analog Front-End (AFE) was used to experimentally determine the maximum continuous impedance estimation frequency as well as the system impedance estimation error when measuring a 2R1C electrical circuit model. Transthoracic Electrical Bioimpedance (TEB) measurements in a healthy subject were obtained using 3M gel electrodes in a tetrapolar lateral spot electrode configuration. The obtained TEB raw signal was filtered in MATLAB to obtain the respiration and cardiogenic signals, and from the cardiogenic signal the impedance derivative signal (dZ/dt) was also calculated. The results have shown that the maximum continuous impedance estimation rate was approximately 550 measurements per second with a magnitude estimation error below 1% on 2R1C-parallel bridge measurements. The displayed respiration and cardiac signals exhibited good performance, and they could be used to obtain valuable information in some plethysmography monitoring applications. The obtained results suggest that the AD5933-based monitor could be used for the implementation of a portable and wearable Bioimpedance plethysmograph that could be used in applications such as Impedance Cardiography. These results combined with the research done in functional garments and textile electrodes might enable the implementation of PHS applications in a relatively short time from now.
Place, publisher, year, edition, pages
2013. 559-562 p.
, Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS, ISSN 1557-170X
Bioimpedance measurement, Electrical bio-impedance, Electrical circuit models, Electrode configurations, Impedance cardiography, Impedance measurement, Monitoring applications, Personalised health systems, Application specific integrated circuits, Biomedical equipment, Electric impedance measurement, Electric network analysis, Electrodes, Frequency estimation, Plethysmography, Electric impedance
IdentifiersURN: urn:nbn:se:kth:diva-140000DOI: 10.1109/EMBC.2013.6609561ScopusID: 2-s2.0-84886466230ISBN: 9781457702167OAI: oai:DiVA.org:kth-140000DiVA: diva2:688570
2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013; Osaka, Japan, 3-7 July 2013
QC 201401172014-01-172014-01-162014-01-22Bibliographically approved