Test device for analyzing a biological sample liquid
View Patent ↗The invention concerns a test device for analyzing especially a biological sample liquid comprising a composite body consisting of a plurality of layers of flat materials and a sample channel located in the composite body for transporting the sample liquid from an application site to a measuring site. According to the invention it is proposed that the composite body has a plurality of transport layers arranged in a stack-like manner between support layers for holding in each case sample channel.
1. A device for analyzing a biological liquid sample comprising:
a composite body of a plurality of layers of flat materials defining two or more sample channels, the sample channels extending along a longitudinal dimension of the composite body and being configured for transporting the sample liquid from an application site to two or more measuring sites, wherein
the plurality of layers of flat materials comprise a plurality of transport layers arranged in a stack-like manner between two support layers,
the transport layers each comprise two sections having opposing edges which comprise side walls of the sample channels,
the sides of the support layers that face the transport layers are coated with an electrode layer comprising an electrically conductive material, and
the support layers are laterally displaced relative to one another in a step-like manner, such that the electrode layers comprise a connecting section extending beyond an adjacent transport layer in a lateral dimension, the lateral dimension being generally perpendicular to the longitudinal dimension of the composite body.
2. The device of claim 1 wherein the two or more sample channels are aligned on top of one another in the direction in which the transport layers are stacked.
3. The device of claim 1 wherein the transport layers comprise an electrically insulating foil material.
4. The device of claim 1 wherein the electrode layers that face the transport layers comprise an electrode pair in the area of the measuring sites for the electro-chemical analysis of the sample.
5. The device of claim 1 wherein the electrode layers comprise a noble metal as a measuring electrode and a silver-silverchloride mixture as a counter reference electrode.
6. The device of claim 5 wherein the noble metal is gold, platinum or palladium.
7. The device of claim 1 wherein the transport layers are separated from at least one adjacent electrode layer by an electrically insulating foil mask.
8. The device of claim 7 wherein the foil mask has perforations in the area of the sample channel for forming at least one of the measuring sites.
9. The device of claim 7 wherein the foil mask is hydrophilic.
10. The device of claim 1 wherein reagents that can be taken up by the sample liquid are provided as a dry substance in the area of at least one of the measuring sites.
11. The device of claim 1 wherein the sample channels provide capillary transport of sample liquid between the application site and the measuring sites.
12. The device of claim 1 wherein the application site comprises inlet openings of the sample channels at an edge of the composite body.
13. The device of claim 1 wherein the application site comprises a recess in the composite body in fluid communication with the sample channels.
14. The device of claim 1 further comprising longitudinally spaced venting channels opening to an outer side of the composite body that are in fluid communication with the sample channels.
15. The device of claim 1 further comprising at least one control site for checking the filling of the sample liquid in at least one of the sample channels, the control site comprising at least one electrode configured to measure electrical conductivity at the at least one control site.
16. The device of claim 1 wherein the support layers comprise transparent measuring windows at least in the area of the measuring sites for the optical examination of the sample liquid.
17. The device of claim 1 wherein at least two of the plurality of layers are glued together.
18. A method of analyzing a biological liquid sample comprising determining different parameters of the sample liquid in respective sample channels of a device according to claim 1 .