Sheath flow device of hematology analyzer

Abstract

The invention discloses a sheath flow device of a hematology analyzer. The sheath flow device comprises a sheath flow device seat, a sheath flow chamber and a sheath flow device cover, wherein the sheath flow chamber and the sheath flow device cover are arranged at two ends of the sheath flow device seat; a sample injection needle is arranged in an inner cavity of the sheath flow device seat through a needle seat; the sheath flow chamber comprises a sheath flow chamber body which is of a cube shape; a flow-in cavity, a flow-out cavity and a test cavity communicating the flow-in cavity with the flow-out cavity are formed in the sheath flow chamber body; the test cavity is 60-80 microns high, and the aperture of the test cavity is 50-100 microns; the geometric center of the test cavity is superposed with that of the sheath flow chamber body; the flow-in cavity and the flow-out cavity are symmetric to each other about a horizontal line which penetrates through the geometric center of the test cavity and serves as a symmetric shaft; the center axis of the flow-in cavity, the center axis of the flow-out cavity and the longitudinal center axis of the test cavity are superposed with the longitudinal center axis of the sheath flow chamber body. The sheath flow device disclosed by the invention can simultaneously acquire laser scattering test data and impedance test data of a single cell while being linked with a system.

Description

technical field [0001] The invention relates to a blood cell analyzer, in particular to a sheath flow device for a blood cell analyzer. Background technique [0002] The size of white blood cells in normal human blood can be classified according to their volume within a certain range. At present, the three-class blood cell analyzers use the "small hole method" (also known as "electrical impedance method" or "Coulter method") to detect It is classified. However, to distinguish eosinophils, basophils, and monocytes with similar white blood cell sizes, a five-differential hematology analyzer is required. [0003] In the five-differentiation blood cell analyzer, in order to analyze the type of each cell, the cells must be arranged neatly through the laser detection area one by one, and receive laser irradiation. The method of realization is "flow cytometry" (also known as "sheath flow technology") , that is, in the sheath flow chamber, the "blood sample" is "liquid focused" th...

AI Technical Summary

Problems solved by technology

However, when the existing sheath flow device is used in conjunction with the system, only the laser light scattering test data of a single cell can be obtained, but the impedance test data of a single cell cannot be obtained.

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