Closed sample cell for use in flow cytometry

• US 5,160,974 A
• Filed: 06/25/1990
• Issued: 11/03/1992
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: Flow Science, Inc.
• Original Assignee: Flow Science, Inc.
• Inventors: Braginsky, Sidney, Siegel, Jeffrey I.
• Primary Examiner(s): Rosenberger, Richard A.
• Application Number:
  US07/542,967
• Time in Patent Office: 862 Days
• Field of Search: 356/246, 356/39
• US Class Current: 356/246
• CPC Class Codes: G01N 15/1404 Handling flow, e.g. hydrodynamic focusing
• CPC Class Codes: G01N 15/1434 Optical arrangements
• CPC Class Codes: G01N 2021/0346 Capillary cells; Microcells
• CPC Class Codes: G01N 2021/5957 using an image detector type detector, e.g. CCD
• CPC Class Codes: G01N 21/05 Flow-through cuvettes G01N21/09 takes precedence; handling fluid samples G01N1/10
• CPC Class Codes: G01N 21/53 within a flowing fluid, e.g. smoke

Abstract

A closed flow cell having a cavity with a flexible diaphragm at either end of a flow tube. A sample having particles or biological cells suspended in a fluid is placed within either cavity. Movement of the diaphragm forces the fluid to flow through the flow tube back and forth between the two cavities. Detectors are positioned adjacent the flow tube. A light source, typically a laser, illuminates the flow tube. Scattered light from the light source is detected by the detectors. Various properties of the particle are thereby determined.

Claims

1. A closed flow cell for use in flow cytometry comprising:

a body;

said body having a first cavity therein;

said body having a second cavity therein;

a flow tube connecting said first and second cavity;

a first diaphragm sealing said first cavity;

a second diaphragm sealing said second body;

detector means, associated with said flow tube, for detecting predetermined properties of particles in suspension;

a charge injector in said first and second cavity; and

a transparent electrode positioned adjacent said flow tube, whereby movement of said first and second diaphragms causes a fluid to flow through said flow tube between said first and second cavities.

2. A closed flow cell for use in flow cytometry comprising:

a body;

said body having a first cavity therein;

said body having a second cavity therein;

a flow tube connecting said first and second cavity;

a first diaphragm sealing said first cavity;

a second diaphragm sealing said second body; and

a cavitator in said first and second cavity,

whereby movement of said first and second diaphragms causes a fluid to flow through said first tube between said first and second cavities.

3. A closed flow sample cell for use in flow cytometry comprising:

a body, said body having a first end and a second end, said first end having a first cone shaped cavity therein, said second end having a second cone shaped cavity therein;

a flow tube positioned between and connecting the smaller diameter ends of said first and second cone shaped cavities, said flow tube having a predetermined diameter based upon the particle size being analyzed;

a first diaphragm sealing the larger exterior opening of said first cavity;

a second diaphragm sealing the larger exterior opening of said second cavity;

said body having an injection port extending from the exterior surface of said body into one of said first or second cavities;

a self sealing membrane associated with said injection port;

a pair of diode detectors positioned parallel to each other with said flow tube therebetween;

a pair of transparent electrodes positioned adjacent said flow tube between said flow tube and said pair of diode detectors;

a pair of cavitators, one positioned in each said first and second cavities; and

a pair of charge injectors, one positioned in each said first and second cavities;

whereby predetermined properties of particles suspended in a fluid can be determined while remaining sealed within the cell.