Bio-Signal Electrodes Having Electro-Chemical Power Generation Capability Aimed for Operating Power of Intra-Corporeal Capsule- Telemeter Transmitter Matsumoto S, Takeuchi Y, Kakizaki H Asahikawa Medical University, Asahikawa, Japan [email protected]ISOB2014 session 3-3 2014.5.20@Kyoto Univ.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Bio-Signal Electrodes Having Electro-Chemical Power Generation Capability Aimed for
Operating Power of Intra-Corporeal Capsule-Telemeter Transmitter
NGConductive gel at center and surrounding adhesive on foam is “conductive”, it always make generating mode even at off-skin situation. No way to stop.
OKCentral gel-foam on AgAgCl disc is insulated by plastic ring against outer ring of adhesive foam. The AgAgCl disc and Magnesium ring are
insulated when off from skin, to stop generating.
hp14445A modified Mg-AgAgCl dual part generating electrode
(1) place on dry skin (foot)
(2) change position to wet/sweaty skin (chest)
(3) move to fully saline soaked bank of tissue paper
(4) move to fully urea soaked bank of tissue paper
vertical full scale: 2V, horizontal pace: 10 minutes/cm. Disturbances are seen with electrochemical instability (1-2) and lead wire electrical contact instability (2-3-4).
hp14445A modified Mg-AgAgCl dual part generating electrode, life time history of in-operation electrical output.
hp14445A modified Mg-AgAgCl dual part generating electrode, life time history of in-operation electrical output.
Amplifier operation limit
RF osc operation limit
hp14445A modified Mg-AgAgCl dual part generating electrode, life time history of electrical output in detail. Electrolyte = 0.9% saline water, load resistance = 100Kohm.
One hour
10 min.
start
Renewing electrolyte after about 24 hours.
Final moment of life, at about 60 hours.
speculation
From experimental behavior, it is suggested that the life of this primary battery system is determined by fatigue or ceasing of the cathode side material Ag-AgC
l, not by that of the anode side material Mg.
The cathode side material Ag-AgCl compound seems to lose the nature of unpolarizing electrode, at end of the system life. The balanced or buffered situation
in between Ag and AgCl seems to be lost.
Which of Ag or AgCl “looses” is not well known, or to be determined by anoth
er experiment.
Fighting of cathode material at end-of-life-phase
Dead spot of Ag-AgCl evokes backing material (Cu or Fe?) where another competing local battery system appears for another voltage 1.2V. When the competing local battery spots are all oxidized and looses, system backs to remaining Ag-AgCl anode for 1.55V. Repeating this fighting time by time, sy
stem ends the life when all the available AgAgCl is gone.