BIOSENSOR

摘要

A biosensor capable of accurately measuring even a specimen liquid containing a solid composition such as blood corpuscle and providing less variation in response value, comprising an insulating substrate, an electrode system at least having an acting electrode and an electrode opposite to the acting electrode installed on the substrate, a cover member combined with the substrate to form a specimen liquid feed path for leading a specimen liquid from a specimen feed part to the electrode system in the space thereof from the substrate, a reaction reagent system containing at least oxidoreductase and electronic mediator, and a filter disposed between the electrode system and the specimen feed part in the specimen feed path, wherein a space part surrounding all around the surface of the filter is formed in an area ranging from the specimen feed part side end of the filter to the electrode system side end thereof, whereby the solid composition such as blood corpuscle is prevented from flowing into the electrode system without being filtrated through the filter.