Reduction of current density at disk electrode periphery by shaping current pulse edges.
Previous studies reveal that the primary distribution of the current density is sharply enhanced at the edge of a disk electrode submerged into a semi-infinite space of conductive solution. The current enhancement will cause the double layer capacitance at the periphery of the electrode to be charged much faster compared to the center, and can also lead to severe corrosion at the edge. While several studies focused on the geometric design of the electrode to reduce this enhancement, we explore the feasibility of achieving similar effect by shaping the edges of the current input. The simulation uses finite element analysis software to solve the system of partial differential equations and results show that the edge enhancement could be greatly reduced without significantly changing the input efficacy of current and/or charge.
Biomedical Engineering Department, Viterbi School of Engineering, University of Southern California, Los Angeles, CA 90007, USA. boshuowa@usc.edu
Boshuo
B
Wang
James D
JD
Weiland
D000818:Animals; D003198:Computer Simulation; D017076:Computer-Aided Design; D004558:Electric Stimulation / Q000295:instrumentation*; D004567:Electrodes, Implanted; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008959:Models, Neurological; D009474:Neurons / Q000502:physiology*