DocumentCode :
141264
Title :
Measurement of high-resolution mechanical contraction of cardiac muscle by induced eddy current
Author :
Young-Jae Lee ; Kang-Hwi Lee ; Seung-Jin Kang ; Kyeung-Nam Kim ; Seonah Khang ; Hye Ran Koo ; Sunok Gi ; Joo Hyeon Lee ; Jeong-Whan Lee
Author_Institution :
Sch. of Biomed. Eng., Konkuk Univ., Seoul, South Korea
fYear :
2014
fDate :
26-30 Aug. 2014
Firstpage :
6286
Lastpage :
6289
Abstract :
There are many types of devices which help to manage a personal health conditions such as heartbeat chest belt, pedometer and smart watch. And the most common device has the relationship with heart rate or ECG data. However, users have to attach some electrode or fasten the belt on the bare skin to measure bio-signal information. Therefore, most of people want more convenient and short-ready-time and no-need to attach electrode. In this paper, we proposed the high-resolution measuring system of mechanical activity of cardiac muscle and thereby measure heartbeat. The principle of the proposed measuring method is that the alternating current generate alternating magnetic field around coil. This primary magnetic field induces eddy current which makes magnetic field against primary coil in the nearby objects. To measure high-resolution changes of the induced secondary magnetic fields, we used digital Phase-locked loop(PLL) circuit which provides more high-resolution traces of frequency changes than the previous studies based on digital frequency counter method. As a result of our preliminary experiment, peak-peak intervals of the proposed method showed high correlation with R-R intervals of clinical ECG signals(r=0.9249). Also, from signal traces of the proposed method, we might make a conjecture that the contraction of atrium or ventricle is reflected by changing conductivity of cardiac muscle which is beating ceaselessly.
Keywords :
biomechanics; biomedical measurement; digital phase locked loops; electrocardiography; magnetic fields; muscle; ECG signals; PLL circuit; R-R intervals; alternating magnetic field; atrium contraction; cardiac muscle; digital frequency counter method; digital phase-locked loop circuit; heartbeat measurement; high-resolution measuring system; high-resolution mechanical contraction; induced eddy current; mechanical activity; primary magnetic field; secondary magnetic fields; ventricular contraction; Coils; Current measurement; Eddy currents; Electrocardiography; Magnetic fields; Muscles; Phase locked loops;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE
Conference_Location :
Chicago, IL
ISSN :
1557-170X
Type :
conf
DOI :
10.1109/EMBC.2014.6945066
Filename :
6945066
Link To Document :
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