Document Detail


Characterization of micromachined spiked biopotential electrodes.
MedLine Citation:
PMID:  12046705     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We present the characterization of dry spiked biopotential electrodes and test their suitability to be used in anesthesia monitoring systems based on the measurement of electroencephalographic signals. The spiked electrode consists of an array of microneedles penetrating the outer skin layers. We found a significant dependency of the electrode-skin-electrode impedance (ESEI) on the electrode size (i.e., the number of spikes) and the coating material of the spikes. Electrodes larger than 3 x 3 mm2 coated with Ag-AgCl have sufficiently low ESEI to be well suited for electroencephalograph (EEG) recordings. The maximum measured ESEI was 4.24 k(omega) and 87 k(omega), at 1 kHz and 0.6 Hz, respectively. The minimum ESEI was 0.65 k(omega) an 16 k(omega), at the same frequencies. The ESEI of spiked electrodes is stable over an extended period of time. The arithmetic mean of the generated dc offset voltage is 11.8 mV immediately after application on the skin and 9.8 mV after 20-30 min. A spectral study of the generated potential difference revealed that the ac part was unstable at frequencies below approximately 0.8 Hz. Thus, the signal does not interfere with a number of clinical applications using real-time EEG. Comparing raw EEG recordings of the spiked electrode with commercial Zipprep electrodes showed that both signals were similar. Due to the mechanical strength of the silicon microneedles and the fact that neither skin preparation nor electrolytic gel is required, use of the spiked electrode is convenient. The spiked electrode is very comfortable for the patient.
Authors:
Patrick Griss; Heli K Tolvanen-Laakso; Pekka Meriläinen; Göran Stemme
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  49     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-06-05     Completed Date:  2002-07-19     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  597-604     Citation Subset:  IM    
Affiliation:
Department of Signals, Sensors and Systems, Royal Institute of Technology, Stockholm, Sweden. patrick.griss@s3.kth.se
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MeSH Terms
Descriptor/Qualifier:
Anesthesia, General
Electric Impedance
Electrodes*
Electroencephalography / instrumentation*,  methods*,  statistics & numerical data
Equipment Design
Fourier Analysis
Humans
Monitoring, Physiologic / instrumentation,  methods
Reproducibility of Results
Sensitivity and Specificity
Silver
Silver Compounds
Chemical
Reg. No./Substance:
0/Silver Compounds; 7440-22-4/Silver; 7783-90-6/silver chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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