Importance

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Abstract

In a test strip for use with a measuring device for determining the concentration of a substance in a body fluid by means of an optical measuring system using a beam of light directed onto a measuring field of the measuring strip, the measuring strip is formed of a bottom layer, a cover layer and a spacer layer located between the bottom layer and the cover layer. The bottom layer has a pass through opening for the light beam and the cover layer has a drop application opening with these two openings being displaced from one another so as to be out of overlapping relationship with one another. The spacer layer has an elongated opening or recess, a portion of which overlies the pass through opening of the bottom layer and another portion of which underlies the drop application opening of the upper layer. The recess in the spacer layer also receives a web of absorbent material, which absorbent material overlies the beam pass through opening and forms the measuring field. Body fluid applied to the drop application opening is absorbed by the absorbent material of the measuring field. The material of the spacing layer may also be absorbent but has an absorption response retarded from that of the measuring field material, so that the measuring field material fills itself with the applied body fluid before a significant amount of the body fluid is absorbed by the material of the spacing layer.

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First Claim