An experimental study on passive charge balancing

Abstract. This paper presents a simplified analysis of the electrode potential upon mismatched, biphasic stimulation using passive discharge techniques, e.g. by shortening of the electrodes. It turns out that especially for microelectrodes the required shorting intervals become as large as to limit a feasible stimulation interval. If no blocking capacitors can be used due to limited space and the degree of miniaturisation, the passive discharge even imposes severe risks to the surrounding tissue and the electrode.

[1]  Thomas Stieglitz,et al.  Biomedical Microdevices for Neural Implants , 2006 .

[2]  Maurits Ortmanns,et al.  Charge Balancing in Functional Electrical Stimulators: A Comparative Study , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[3]  Xiao Liu,et al.  Implantable Stimulator Failures: Causes, Outcomes, and Solutions , 2007, 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[4]  Rahul Sarpeshkar,et al.  A Low-Power Blocking-Capacitor-Free Charge-Balanced Electrode-Stimulator Chip With Less Than 6 nA DC Error for 1-mA Full-Scale Stimulation , 2007, IEEE Transactions on Biomedical Circuits and Systems.

[5]  J. Thomas Mortimer,et al.  Imbalanced biphasic electrical stimulation: Muscle tissue damage , 2006, Annals of Biomedical Engineering.

[6]  M. Ortmanns,et al.  A 232-Channel Epiretinal Stimulator ASIC , 2007, IEEE Journal of Solid-State Circuits.

[7]  Thomas Stieglitz,et al.  ELECTRODE MATERIALS FOR RECORDING AND STIMULATION , 2004 .

[8]  Thomas Stieglitz,et al.  A voltage-controlled current source with regulated electrode bias-voltage for safe neural stimulation , 2008, Journal of Neuroscience Methods.