Oxygen Fields Induced by Recessed and Needle Oxygen Microelectrodes in Homogeneous Media

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Abstract
Accurate interpretation of the experimental results obtained with oxygen microelectrodes requires a knowledge of the extent to which the PO2 disturbance generated by the electrode extends into the medium under study. We have developed computer simulations (1) of the PO2 fields surrounding the two most common types of microelectrodes, recessed and needle. The simulations allow us to characterize a probe from its approximate shape and its electrical current before and after membrane application. It also allows us to decide, on theoretical grounds, which microelectrode design would be best for a particular experiment. The theoretical model described here is for a cathode in a homogeneous, non-consuming medium. It would, however, be equally valid in a medium consuming O2 at a constant rate (2) and the results found here would be similar to those in a real tissue.

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