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Curved Microneedle Array-Based sEMG Electrode for Robust Long-Term Measurements and High Selectivity.

Kim M, Kim T, Kim DS, Chung WK - Sensors (Basel) (2015)

Bottom Line: However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited.The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h.The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea. minjaekim@postech.ac.kr.

ABSTRACT
Surface electromyography is widely used in many fields to infer human intention. However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited. In this paper, we propose a flexible band-integrated, curved microneedle array electrode for robust long-term measurements, high selectivity, and easy applicability. Signal quality, in terms of long-term usability and sensitivity to perspiration, was investigated. Its motion-discriminating performance was also evaluated. The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h. The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

No MeSH data available.


Examination of skin of the forearm wearing the electrodes for 8 h.
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f4-sensors-15-16265: Examination of skin of the forearm wearing the electrodes for 8 h.

Mentions: The MNA was fabricated using commercially available acupuncture needles. Our detailed MNA fabrication process is described in [15,16]. A master template with acupuncture needles was prepared. Then, the MNA was fabricated by a micro-molding process with a PDMS mold to replicate the master template. Here, PLA, a biodegradable polymer was used for the replication as an MNA substrate because the PLA has a moderate melting/glass temperature for the replication. Furthermore, although the PLA can be degraded on the skin, the silver/titanium coating prevents such degradation during use. This fabrication process is described in Figure 3. The fabricated MNA electrode consisted of a 10 by 10 needle array with a pitch of 0.95 mm at the base of 8.5 by 8.5 mm2. The diameters of the tip and the body of each needle were 10 and 150 µm, respectively. The length of each needle was about 350 µm, which was determined to measure the sEMG signal without causing pain. Furthermore, no itching or inflammation was observed during and after wearing for 8 h, as shown in Figure 4.


Curved Microneedle Array-Based sEMG Electrode for Robust Long-Term Measurements and High Selectivity.

Kim M, Kim T, Kim DS, Chung WK - Sensors (Basel) (2015)

Examination of skin of the forearm wearing the electrodes for 8 h.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541878&req=5

f4-sensors-15-16265: Examination of skin of the forearm wearing the electrodes for 8 h.
Mentions: The MNA was fabricated using commercially available acupuncture needles. Our detailed MNA fabrication process is described in [15,16]. A master template with acupuncture needles was prepared. Then, the MNA was fabricated by a micro-molding process with a PDMS mold to replicate the master template. Here, PLA, a biodegradable polymer was used for the replication as an MNA substrate because the PLA has a moderate melting/glass temperature for the replication. Furthermore, although the PLA can be degraded on the skin, the silver/titanium coating prevents such degradation during use. This fabrication process is described in Figure 3. The fabricated MNA electrode consisted of a 10 by 10 needle array with a pitch of 0.95 mm at the base of 8.5 by 8.5 mm2. The diameters of the tip and the body of each needle were 10 and 150 µm, respectively. The length of each needle was about 350 µm, which was determined to measure the sEMG signal without causing pain. Furthermore, no itching or inflammation was observed during and after wearing for 8 h, as shown in Figure 4.

Bottom Line: However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited.The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h.The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea. minjaekim@postech.ac.kr.

ABSTRACT
Surface electromyography is widely used in many fields to infer human intention. However, conventional electrodes are not appropriate for long-term measurements and are easily influenced by the environment, so the range of applications of sEMG is limited. In this paper, we propose a flexible band-integrated, curved microneedle array electrode for robust long-term measurements, high selectivity, and easy applicability. Signal quality, in terms of long-term usability and sensitivity to perspiration, was investigated. Its motion-discriminating performance was also evaluated. The results show that the proposed electrode is robust to perspiration and can maintain a high-quality measuring ability for over 8 h. The proposed electrode also has high selectivity for motion compared with a commercial wet electrode and dry electrode.

No MeSH data available.