Particle analyzing and sorting apparatus

Abstract

Disclosed is a flow-through, particle analyzer and sorter apparatus for simultaneous optical and electrical impedance measurements on a stream of particles, comprising a flow cell having a pair of channels fluidly connected by a particle sensing aperture, through which the particles pass and are analyzed; a nozzle mounted at the end of the downstream channel so as to define a flow chamber; a sheath liquid which is introduced at the bottom of the flow chamber to hydrodynamically focus the particle stream and to jet the same in a liquid jet from the nozzle; and a system for creating droplets from the liquid jet and for thereafter sorting the droplets.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates generally to particle analyzing and sorting apparatus and more particularly is concerned with apparatuses in which studies may be made of particulate systems using the impedance sensing principle and optical measurements.

2. Description of Prior Art

Since its conception in the early 1950's, the principle of particle counting and sizing invented by Wallace H. Coulter has resulted in numerous methods and flow-through apparatuses for the electronic counting, sizing and analysis of microscopic particles, which are scanned in a fluid suspension, as shown by the pioneer U.S. Pat. No. 2,656,508 to Coulter. In this prior art arrangement, a D.C. electric current flow is established between two vessels by suspending electrodes in the respective bodies of the suspension fluid. The only fluid connection between the two bodies is through an orifice; hence, an electric current flow and field are established in the orifice. The orifice and the resultant electric field in and around it constitute a sensing zone. As each particle passes through the sensing zone, for the duration of the passage, the impedance of the

US Referenced Citations (7)

Number	Name	Date	Kind
2656508	Coulter	Oct 1953
3710933	Fulwyler et al.	Jan 1973
3871770	von Behrens et al.	Mar 1975
3873204	Friedman et al.	Mar 1975
4014611	Simpson et al.	Mar 1977
4348107	Leif	Sep 1982
4395676	Hollinger et al.	Jul 1983

Non-Patent Literature Citations (2)

E. Menke, E. Kordwig, P. Stuhlmuller, V. Kachel and G. Ruhenstroth-Bauer; "A Volume-Activated Cell Sorter", The Journal of Histochemistry and Cytochemistry; vol. 25, No. 7, pp. 796-803, 1977.
R. A. Thomas, T. A. Yopp, B. D. Watson, D. H. K. Hindman, B. F. Cameron, S. B. Leif, R. C. Leif, L. Roque and W. Britt; "Combined Optical and Electronic Analysis of Cells with the AMAC Transducers", The Journal of Histochemistry and Cytochemistry; vol. 25, No. 7, pp. 827-835, 1977.