US 2003/0157724 A1Published application

Test element analysis system

AssigneeRoche Diagnostics GmbH

InventorsWolfgang Petrich, Wilfried Schmid, Gerrit Kocherscheidt, Jean-Michel Asfour, Gerrit Kocherscheidt, Jean-Michel Asfour

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Abstract

Test element analysis system for the analytical investigation of a sample, in particular of a body liquid of human beings or animals, comprising test elements (2) with a carrier film (5) and a test field (7) fixed to the flat side (6) of the carrier film (5), the test field (7) containing a reagent system the reaction of which with the sample (21) leads to an optically measurable change in the detection zone (24) which is characteristic for the analysis, and an evaluation instrument with a measuring device for measuring the optically measurable change. In order to obtain a very high measuring accuracy and an easy handling at the same time, the carrier film (5) of the test element (2) comprises a light guide layer (26), the detection zone (24) of the test field (7) is in optical contact to the light guide layer (26) in a coupling out zone (33), enabling the coupling out of light from the light guide layer (26) to the detection zone (24), the primary light (29) of the light emitter (16) is coupled into the entry surface (31) in the light guide layer (26) in such a manner that a light guide section (32) of the light path of the primary light (29) runs between the entry surface and the detection zone (24) inside the carrier film (5), and the secondary light is reflected from the detection zone (24) into the light guide layer (26) in such a manner that a light guide section (34) of the light path of the secondary light runs between the detection zone (24) and the detector (17) inside the light guide layer (26).

Claims14

Dependent claims

Test element analysis system for the analytical investigation of a liquid sample, in particular of a body liquid of human beings or of animals, comprising

test elements (2) with a carrier film (5) of plastic material and a test field (7) secured to a flat side (6) of the carrier film (5) which test field is contacted, in order to perform an analysis, with the sample (21) in such a manner that liquid sample components penetrate into the test field (7), wherein the test field (7) contains a reagent system the reaction of which with components of the sample (21) causes an optically measureable change in a detection zone (24) located on the side of the test field (7) directed towards the carrier film (5), said change being characteristic for the analysis and
an evaluation instrument (3) with a test element holder (12) for positioning a test element (2) in a measuring position, and with a measuring device (18) for measuring the optically measurable change in the detection zone (24), wherein the measuring device (18) comprises a light emitter (16) for irradiating primary light (29) onto the detection zone (24) and a detector (17) for detecting secondary light (35) diffusely reflected from the detection zone (24),
characterized in that
the carrier film (5) of the test element (2) comprises a light guide layer (26),
the carrier film (5) comprises a coupling out zone (33) which is a part of the flat side of the carrier film (5) to which the test field (7) is fixed and within which the detection zone (24) of the test field (7) is in optical contact to the carrier film (5) in such a manner that light is coupled out from the light guide layer (26) into the detection zone (24),
the primary light (29) of the light emitter (16) is coupled into the light guide layer (26) via an entry surface (31), in such a manner that a light guide section (32) of the light path of the primary light (29) between the entry surface (31) and the detection zone (24) runs inside the interior of the light guide layer (26) and
the secondary light which is diffusely reflected from the detection zone (24) is reflected into the light guide layer (26) and a light guide section (34) of the light path of the secondary light between the detection zone (24) and the detector (17) runs inside the carrier film (5).

4 more elements

Test element for the analytical investigation of a liquid sample, in particular of a body liquid of human beings or animals,

with a carrier film (5) of plastic material and a test field (7) secured to a flat side (6) of the carrier film (5) which test field is contacted, in order to perform an analysis, with the sample (21) in such a manner that liquid sample components penetrate into the test field (7),
wherein the test field (7) contains a reagent system the reaction of which with components of the sample (21) causes an optically measurable change in a detection zone (24) which is a part of the test field (7), the change being characteristic for the analysis, and wherein primary light irradiated onto the detection zone 10 is diffusely reflected therefrom
characterized in that
the carrier film (5) of the test element (2) comprises a light guide layer (26),
the carrier film (5) comprises a coupling out zone (33) which is a part of the flat side of the carrier film (5) to which the test field (7) is fixed and within which the detection zone (24) of the test field (7) is in optical contact to the carrier film (5) in such a manner that light is coupled out from the light guide layer (26) into the detection zone (24),
the light guide layer (26) comprises an entry surface (31) for coupling in primary light in such a manner that a light guide section (32) of the light path of the primary light coupled into the light guide layer (26) runs inside the light guide layer (26) between the entry surface (31) and the detection zone (24),
the secondary light which is diffusely reflected from the detection zone (24) is reflected into the light guide layer (26), and a light guide section (34) of the light path of the secondary light runs between the detection zone (24) and the detector (17) inside the carrier film (5).

4 more elements

Dependencies are inferred from the claim text.