Apparatus for pumping and directing fluids for hematology testing
US5380491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Jan 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/1409
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for hematology testing, which has a sensing unit defining a counting orifice for the flow of a blood sample through the counting orifice to analyze the blood sample, and a pump unit having three syringes. A first syringe is coupled in fluid communication with the sensing unit on the inlet side of the counting orifice for injecting a stream of blood sample through the counting orifice. A second syringe is coupled in fluid communication with the sensing chamber on the inlet side of the counting orifice for simultaneously injecting a sheath of fluid surrounding the sample stream on the inlet side of the counting orifice. And a third syringe is coupled to the sensing chamber on the outlet side of the counting orifice for aspirating a sheath of fluid from the sensing chamber surrounding the sample stream on the outlet side of the counting orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.