Test carrier with separation means for analyzing a sample fluid

US5188966A · kind A · utility

Assignee

• Boehringer Mannheim GmbH · DE

Inventors

• Heino Eikmeier · Lorsch, DE
• Anselm Rothe · Birkenau, DE

Key dates

• Filing date: Feb 12, 1991
• Grant date: Feb 23, 1993
• Expiry date: Feb 12, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S435/97
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Test carrier for analyzing a sample fluid with several test layers which form a sample fluid transport path and contain a reagent system which reacts with the sample fluid to produce a detectable signal. The test carrier includes a reservoir layer of absorbent material, a detection layer arranged in the fluid transport path downstream the reservoir layer, in which a detectable signal is formed, and a separating layer arranged between the reservoir layer and the detection layer. The separating layer makes a two-step process possible. Fluid contact between the reservoir layer and the detection layer arises only with pressure loading of the layer assembly of the reservoir layer, separating layer and detection layer. A more uniform optical detection signal, and consequently better accuracy, can be achieved because the separating layer is made up of a hydrophilic material, wich is in the form of a lattice-shaped structure, in which the mean width of the lattice openings is more than 0.05 mm, and the threads from which the lattice-shaped structure is formed are multi-filament.