Determination of white blood cell differential and reticulocyte counts
US6350613B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1999 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Feb 18, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/101666
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Target nucleated cells, and target cells containing remnant ribosomal material, which are present in a quiescent anticoagulated whole blood sample are optically detected, enumerated, and analyzed in a sample chamber that has a varying through plane thickness due to convergent opposing sample chamber walls. At least one of the convergent walls of the chamber is transparent so that the blood sample can be observed. The chamber's varying thickness produces a first lesser thickness region in the chamber wherein individual red cells and quiescent monolayers of red cells in the sample will reside after the sample is introduced into and fills the chamber. Larger formed constituents such as white blood cells and nucleated red blood cells present in the sample will reside in greater thickness regions of the chamber, and non-nucleated red cells which reside in such greater thickness regions will agglomerate to form rouleaux. By admixing fluorescent dyes with the blood sample, target cells in the sample can be enumerated and differentiated by means of a scanning instrument which is able to measure different wave length color signals emitted from the target cells in the sample, and differentia…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.