Constant volume chemical analysis test device
US4994238A · kind A · utility
Inventors
Key dates
| Filing date | Jun 9, 1988 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jun 9, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12Q1/54
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The multilayer test devices of this invention comprise, in order, (a) an absorbent layer; (b) a waterproof barrier layer; and (c) a quickly absorbent reagent layer having a determinate volume. The absorbent and barrier layers each include an aperture functionally aligned for application of a test sample through the absorbent and barrier layers and onto the surface of the reagent layer. The reagent layer contains one or more reagents which produce a detectable species in the presence of an analyte. The reagent layer preferably comprises an asymmetrical filter, which localizes cellular components of the test sample at or near the surface of the filter, while facilitating saturation of the filter by non-cellular sample components. Preferred embodiments of the test devices include devices for testing glucose, alcohol, cholesterol, or other analytes in whole blood.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.