DocumentCode :
32097
Title :
Scaling of Electrode-Electrolyte Interface Model Parameters In Phosphate Buffered Saline
Author :
Jones, Mark H. ; Scott, Jonathan
Author_Institution :
Sch. of Electron. Eng., Univ. of Waikato, Hamilton, New Zealand
Volume :
9
Issue :
3
fYear :
2015
fDate :
Jun-15
Firstpage :
441
Lastpage :
448
Abstract :
We report how the impedance presented by a platinum electrode scales with the concentration of phosphate buffered saline (PBS). We measure the response in various dilutions of PBS with an electrode array as is commonly used in spinal cord stimulator (SCS) implants. We match the parameters of a non-linear electrode-electrolyte interface model to these measurements. We find that the constant phase element of the model scales with approximately the log of concentration, whereas the resistivity is inversely proportional. Using a novel DC measurement technique we show that the onset of Faradaic conduction for a platinum electrode, and thus the safe exposure limit, does not scale with concentration. We compare objective measurements made in saline to those made in the spinal cavity of live sheep. We comment upon the appropriateness of using PBS as a substitute for in-vivo measurements.
Keywords :
biochemistry; bioelectric phenomena; biomedical measurement; electrical resistivity; electrochemical electrodes; electrolysis; neurophysiology; prosthetics; DC measurement; Faradaic conduction; SCS implants; electrical resistivity; electrode array; in-vivo measurements; live sheep; nonlinear electrode-electrolyte interface model; phase element; phosphate buffered saline concentration; platinum electrode scales; spinal cavity; spinal cord stimulator implants; Biomedical measurement; Current measurement; Electrical resistance measurement; Electrodes; Impedance; Integrated circuit modeling; Voltage measurement; Bioelectric phenomena; bioimpedance; biomedical electrodes; biomedical measurements; biophysics; electrical stimulation; implantable biomedical devices;
fLanguage :
English
Journal_Title :
Biomedical Circuits and Systems, IEEE Transactions on
Publisher :
ieee
ISSN :
1932-4545
Type :
jour
DOI :
10.1109/TBCAS.2014.2333759
Filename :
6879501
Link To Document :
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