A microflow amperometric glucose biosensor.

We investigate a small glucose sensor that uses a flow-through enzyme bed and reaction endpoint approach that seems particularly suited to microdialysis-type subcutaneous or intravascular glucose sensors. The particular configuration has the advantage of relative insensitivity to blood oxygen changes and also to factors which affect enzyme activity compared to conventional polarographic type glucose sensors. We evaluate the placement of a microdialysis fiber into a near-surface blood vessel in the dog model as a means of blood glucose sampling and to determine the effects of protein deposition. We observe a progressive decline in intravascular membrane fiber transport that must be considered in sensor design.