Patent ID: 7497940

Claim:
A glucose sensor comprising a housing, an insulating substrate mounted in the housing, a working electrode formed on the insulating substrate within the housing, a counter electrode formed on the insulating substrate within the housing, a first hollow needle projecting out from the housing that sticks into skin, samples a body fluid, and supplies the body fluid to the working electrode, and a second hollow needle projecting out from the housing that sticks into the skin, samples the body fluid and supplies the body fluid to the counter electrode, the working electrode including a conductive component and glucose dehydrogenase immobilized to the conductive component; wherein the glucose dehydrogenase is a protein complex including a catalytic activity subunit in which flavin adenine dinucleotide is bound as coenzyme and which has glucose dehydrogenase activity, and an electron mediator subunit for supplying an electron donated from the catalytic activity subunit to the conductive component.