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Journal of Electrical Bioimpedance
Volume 6 (2015): Numero 1 (January 2015)
Accesso libero
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
e
Tobias Wartzek
Tobias Wartzek
| 03 apr 2015
Journal of Electrical Bioimpedance
Volume 6 (2015): Numero 1 (January 2015)
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Article Category:
Articles
Pubblicato online:
03 apr 2015
Pagine:
2 - 9
Ricevuto:
14 ott 2014
DOI:
https://doi.org/10.5617/jeb.953
Parole chiave
chronic venous insufficiency
,
impedance plethysmography
,
capacitive measurement
,
real-time detection algorithm
© 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.
Fig. 2
Measuring arrangement for impedance measurement with two or four electrodes and the corresponding equivalent electric circuit.
Fig. 3
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.
Fig. 5
Circuit diagram of the differential amplifier.
Fig. 6
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.
Fig. 10
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.
Measurement period and number of detected pulse waves for the bent and stretched leg.
period
N
PPG
N
IPG
N
TP
N
FN
N
FP
bent leg
128 s
150
97
97
53
0
stretched leg
100 s
116
81
81
35
0