ELECTRODE CONFIGURATION FOR A BIOSENSOR

A biosensor including a capillary chamber having an inner boundary, a working electrode including an effective working electrode portion positioned within the capillary chamber, and a counter electrode including an effective counter electrode portion positioned within the capillary chamber, and with the working and counter electrodes each having a neck that constitutes the sole portion of the electrodes that extends across the inner boundary and out of the capillary chamber. In one embodiment, the effective working electrode portion defines an average working electrode width, and the working electrode neck defines a working electrode neck width that is reduced relative to the average working electrode width. In another embodiment, a ratio between the area of the effective working electrode portion exposed to the capillary chamber and the area of the effective counter electrode portion exposed to the capillary chamber is substantially constant as a position of the inner boundary of the capillary chamber is varied along a length of the working and counter electrode necks.