Realization and Evaluation of the Device for Measuring the Impedance of Human Body for Detecting the Respiratory and Heart Rate

Abstract

The idea of a device for measuring the impedance of human body with the target of monitoring the respiratory and heart rate is proposed in this paper. Hardware realization of the proposed idea is described with the illustration of the custom designed printed circuit board. Preparation of electrode shirts with various electrode placement configurations is introduced. Series of experimental measurements in the cases of dynamic bioimpedance reference and single human subject are described and results shown to evaluate the custom made device. The excitation frequencies in the range of 2 MHz-20 MHz are utilized in the cases of large foil and textile electrodes to focus on the use of the capacitive connection to the object-constituting the novelty of the current paper. The results are analysed concerning the dependency of the visual availability of the interesting signal of breathing and heart rate of the material and the placement of the electrodes. Availability of breathing is found to be evident in all of the experimented cases. The heart rate is found to be challenging because of the presence of high frequency noise.

Fiducial Point Estimation Solution for Impedance Cardiography Measurements

“…Much more reasonable alternative, proposed in the current paper, is to use the "edge computing" principles, extracting the main information just near the sensor, "at first possibility", still in the analog signal domain. For possible implementation of the cardiac activity (or cardiorespiratory, as ICG is reflecting also the lung activity [15]) monitoring device into the smart chip, with local artificial intelligence (AI) is clearly beneficial. The chip has to be low-power with simple and robust enough algorithms.…”

Performance Comparison of Cotton and Silk Substrates on 1.575 GHz Frequency Textile Antenna

“…In [7], it was explained that the study used an antenna with a silk, nylon, and leather substrate with size dimensions of about 215.5 mm × 115 mm and working at MICS and ISM frequencies, whereas the gain on a silk antenna at a frequency of 1.49 GHz was 1.82 dBi. There is also a study [8] that uses a textile electrode in a device designed to measure the impedance of the human body through breathing and heart rate with a frequency range of 2 MHz-20 MHz, while in the paper in [9], the use of flexible electronic measuring (70 mm × 43 mm) in an antenna Manuscript received 13 October, 2020; accepted 16 February, 2021. connected to a microcontroller and functions to monitor biological variables are described. The two papers describe the applications for near field communication.…”