Test carrier for the analysis of fluids

• US 5,284,622 A
• Filed: 09/30/1992
• Issued: 02/08/1994
• Est. Priority Date: 10/02/1991
• Status: Expired due to Fees

• Current Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Original Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Inventors: Schafer, Gerd K. P., Krause, Manfred
• Primary Examiner(s): Housel, James C.
• Assistant Examiner(s): BHAT, NINA NMN
• Application Number:
  US07/953,050
• Time in Patent Office: 496 Days
• Field of Search: 422/55, 422/56, 422/58, 422/60, 422/61, 436/169, 436/170
• US Class Current: 422/401
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: G01N 33/54386 Analytical elements

Abstract

A test carrier for the analysis of fluids has a test field which is held in a frame and a test application surface for the application of a sample fluid. Sometimes called an "analysis chip", such devices are suitable for accommodating a test layer pack which has a plurality of layers lying loosely on one another. These devices are thin and allow for low cost manufacturing and simple and efficient handling, and has a base body of a plastic material, with a trough-shaped depression for accommodating the test field therein. A retaining net of a plastic material spans above the depression and the test field.

Claims

1. A test carrier for the analysis of fluids, comprising:

a flat body formed of a plastic material, said base body having a trough-shaped depression disposed in one of its faces;

a test field disposed in said depression, said test field having a sample application surface thereon, for the application of a sample fluid; and

a retaining net formed of a plastic material spanning said depression and said test field disposed therein.

2. A test carrier for the analysis of fluids as recited in claim 1, wherein said test field comprises a test layer pack having at least two test layers loosely therein, wherein said at least two test layers are loosely disposed in a vertical stack.

3. A test carrier as recited in claim 1, wherein said retaining net covers said sample application surface of said test field.

4. A test carrier for the analysis of fluids as recited in claim 1, wherein said base body is of a thermoplastic material which softens at a temperature which does not affect the dimensional stability of the retaining net, and said base body further comprises a surface strip adjacent to said depression, and wherein said retaining net is melted into said surface strip.

5. A test carrier for the analysis of fluids as recited in claim 4, wherein said surface strip completely surrounds said depression.

6. A test carrier according to claim 1, further comprising a rim which is disposed around a top edge of the depression, said rim being disposed in a recessed portion of the upper surface of the base body.

7. A test carrier for analysis of fluids as recited in claim 1, wherein an outer perimeter of said trough-shaped depression is larger than an outer perimeter of said test field, and wherein said base body further comprises positioning means disposed within the depression for positioning said test field in said depression wherein a gap exists on all sides of the test field, between the outer perimeter of the test field and the outer perimeter of the depression.

8. A test carrier for the analysis of fluids as recited in claim 7, wherein said gap is at least 0.3 mm and at most 1 mm wide.