Electrochemical sensor for measuring the glucose content of glucose containing fluids

摘要

Electrochemical sensor for measuring the glucose content fluids, containing very low oxygen content or no oxygen at all, comprising: a substrate (1) carrying on its passivated surface, a detection electrode (2), a counter electrode (3) cooperating with said detection electrode, a reference electrode (4), an oxygen producing electrode (5), and a second counter electrode (6) cooperating with said oxygen producing electrode. Furthermore the sensor comprises a glucose oxidase (G.O.D) containing hydrogel layer (7) covering said surface of the substrate respectively the electrodes arranged thereon, a membrane impermeable to glucose (8), having an opening or hole (10) rendering said membrane locally permeable for glucose, and a further membrane (9) permeable to oxygen, glucose and water but impermeable for components with high molecular weight in the glucose containing fluid. The arrangement of the various electrodes on the substrate surface and the location of the hole in said membrane is such that the direction of the glucose diffusion path (12) between said hole and the detection electrode opposite to the direction of the oxygen diffusion path (13) between the oxygen producing electrode and the detection electrode.