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Development of a real-time, semi-capacitive impedance phlebography device

Sören Weyer
Sören Weyer
, 
Hannes Weber
Hannes Weber
, 
Christian Kleeberg
Christian Kleeberg
, 
Steffen Leonhardt
Steffen Leonhardt
 oraz 
Tobias Wartzek
Tobias Wartzek
   | 03 kwi 2015
Journal of Electrical Bioimpedance's Cover Image
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Article Category: Articles
Data publikacji: 03 kwi 2015
Zakres stron: 2 - 9
Otrzymano: 14 paź 2014
DOI: https://doi.org/10.5617/jeb.953
Słowa kluczowe
© 2015 Sören Weyer, Hannes Weber, Christian Kleeberg, Steffen Leonhardt, Tobias Wartzek, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

System concept of the semi-capacitive impedance phlebography device.
System concept of the semi-capacitive impedance phlebography device.

Fig. 2

Measuring arrangement for impedance measurement with two or four electrodes and the corresponding equivalent electric circuit.
Measuring arrangement for impedance measurement with two or four electrodes and the corresponding equivalent electric circuit.

Fig. 3

Circuit diagram of the active electrode.
Circuit diagram of the active electrode.

Fig. 4

Upper and lower sides of the active electrode and the measuring arrangement. In the right picture the blue circles mark the positions of the outer current electrodes and the red circles mark the position of the measuring electrodes.
Upper and lower sides of the active electrode and the measuring arrangement. In the right picture the blue circles mark the positions of the outer current electrodes and the red circles mark the position of the measuring electrodes.

Fig. 5

Circuit diagram of the differential amplifier.
Circuit diagram of the differential amplifier.

Fig. 6

Filter for detection of maxima of sa(n).
Filter for detection of maxima of sa(n).

Fig. 7

Measured impedance signal sa(n) and the filtered signals sf(n) and sdf(n). The red cross in sf(n) mark the maxima which are detected by the algorithm.
Measured impedance signal sa(n) and the filtered signals sf(n) and sdf(n). The red cross in sf(n) mark the maxima which are detected by the algorithm.

Fig. 10

Measured signal sa(n) of a 1.8 kΩ resistance at fs = 64Hz, fs = 24 kHz and varying clock frequencies fCLK,AFE.
Measured signal sa(n) of a 1.8 kΩ resistance at fs = 64Hz, fs = 24 kHz and varying clock frequencies fCLK,AFE.

Fig. 9

Bland-Altman plot of the new measurement device and the PPG as gold standard of the bent leg.
Bland-Altman plot of the new measurement device and the PPG as gold standard of the bent leg.

Measurement period and number of detected pulse waves for the bent and stretched leg.

periodNPPGNIPGNTPNFNNFP
bent leg128 s1509797530
stretched leg100 s1168181350
eISSN:
1891-5469
Język:
Angielski
Częstotliwość wydawania:
Volume Open
Dziedziny czasopisma:
Engineering, Bioengineering and Biomedical Engineering, Biomedical Electronics, Life Sciences, Biophysics, Medicine, Biomedical Engineering, Physics, Spectroscopy and Metrology
Kanał RSS czasopisma