Flow cytometric apparatus and method

• US 8,342,044 B2
• Filed: 02/08/2010
• Issued: 01/01/2013
• Est. Priority Date: 04/16/2007
• Status: Active Grant

• Current Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd. (Excelsior Union Ltd.)
• Original Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd. (Excelsior Union Ltd.)
• Inventors: Zhao, Bingqiang, Gan, Quan, Sun, Chengwei
• Primary Examiner(s): Macchiarolo, Peter
• Assistant Examiner(s): BELLAMY, TAMIKO D
• Application Number:
  US12/702,116
• Publication Number:
  US 20100132488A1
• Time in Patent Office: 1,058 Days
• Field of Search: 738/642.1, 738/642.2, 738/648.1, 422/81
• US Class Current: 73/864.21
• CPC Class Codes: G01N 15/1404 Handling flow, e.g. hydrodynamic focusing
• CPC Class Codes: G01N 15/1409 Handling samples, e.g. injecting samples

Abstract

Various embodiments disclose a flow cytometric apparatus comprising a flow chamber to be passed through by a sample in a row in sequence, a sample storage means for metering and storing the sample, a sample syringe for driving the sample into the flow chamber, a syringe-type injection-suction device comprising a sheath liquid syringe and a liquid-path switching means connected with it, and a control unit for controlling the operations of the sample syringe and the syringe-type the injection-suction means. In a sample charging stage, the injection-suction means feeds the sample into the sample storage means so that the sample is temporarily stored in it in a ready-to-use state, and in a sheath-liquid injection stage, the injection-suction means feeds the sheath liquid into the flow chamber to form a sheath flow. A flow cytometric method performed by the flow cytometric apparatus is also disclosed.

Claims

1. A flow cytometric apparatus for testing a sample, comprising:

a sample storage that is to store the sample for testing;

a flow chamber that is to test the sample that is operatively connected to the sample storage;

a single fluid driving device operatively connected to the sample storage and a sheath fluid storage means to drive both the sample and a sheath fluid for testing the sample, wherein

the single fluid driving device is characterized by performing both an injection action and a pipetting action, and

the single fluid driving device switches between a sample flow path and a sheath flow path for charging or discharging the sample or the sheath fluid; and

a control means that is to control the injection action and the pipetting action.

2. The flow cytometric apparatus of claim 1, wherein the single fluid driving device comprises a sheath fluid syringe means which is to perform the injection action and the pipetting action.

3. The flow cytometric apparatus of claim 1, further comprising:

an over-pressure protection means that is to protect one or more fluid flow paths of the flow cytometric apparatus from being over pressurized.

4. The flow cytometric apparatus of claim 3, wherein the over-pressure protection means is to prevent the sheath fluid from entering the sample storage where at least one of the one or more fluid flow paths is determined to be over pressurized.

5. The flow cytometric apparatus of claim 3, wherein the over-pressure protection means is to determine a blockage location in the one or more fluid flow paths of the flow cytometric apparatus.

6. The flow cytometric apparatus of claim 1, further comprising an excessive liquid storage means, wherein the excessive liquid storage means is operatively connected to the sample storage and the single fluid driving device to store excessive fluid flow.

7. The flow cytometric apparatus of claim 6, wherein the excessive liquid storage means is further to prevent the sample from entering the single fluid driving device.

8. The flow cytometric -apparatus of claim 1, wherein the flow cytometric apparatus is to test the sample by driving the sample and the sheath fluid with the single fluid driving device rather than with more than one device to maintain or stabilize a flow rate or pressure for both the sample and the sheath fluid.

9. The flow cytometric apparatus of claim 1, wherein the single fluid driving device is to clean one or more sample flow paths by directing the sheath fluid flow in a reverse direction of a direction in which the sample is driven into the flow chamber.

10. The flow cytometric apparatus of claim 1, wherein the sample is driven into a flow path toward the flow chamber by using a partial pressure of the sheath fluid flow by using a pressure balance means.

11. The flow cytometric apparatus of claim 1, further comprising a sample preparation means that is operatively connected to the sample storage and the flow chamber to achieve a steady flow of the sample into the flow chamber.

12. A method for testing a sample, comprising:

preparing the sample by causing a single fluid driving device for performing an injection action or a pipetting action on the sample to deliver the sample from a sample storage means into a sample preparation means, wherein the

injection action creates a positive pressure, and the pipetting action creates a negative pressure;

injecting a sheath fluid by causing the single fluid driving device to inject or to pipet the sheath fluid into a flow chamber where the sample is to be tested;

injecting the sample from the sample preparation means into the flow chamber; and

testing the sample in the flow chamber.

13. The method of claim 12, further comprising:

using an over-pressure protection means that is to protect one or more fluid paths from being over-pressurized.

14. The method of claim 13, further comprising:

using the over-pressure protection means to prevent the sheath fluid from entering the test chamber, wherein the one or more fluid paths is determined to be over-pressurized.

16. The method of claim 12, wherein the act of cleaning the one or more sample flow paths comprises:

cleaning one or more sample flow paths after the act of testing the sample; and

delivering a sheath fluid flow in a direction that is opposite to a first direction in which the sample is delivered into the flow chamber.

17. The method of claim 12, further comprising:

using an excessive liquid storage means for storing an excessive amount of the sample before the excessive amount of sample is delivered into the flow chamber.

18. The method of claim 12, further comprising:

using an excessive liquid storage means for preventing the sample from entering a driving mechanism of the single fluid driving device.

19. The method of claim 12, wherein the sample and the sheath fluid are delivered into the flow chamber for testing the sample by using the single fluid driving device rather than by using more than one device to maintain or stabilize a flow rate or pressure for both the sample and the sheath fluid.

20. The method of claim 12, wherein the act of injecting the sample comprises:

injecting the sample into the flow chamber by using at least a partial pressure of a sheath fluid flow through a pressure balance means.

15. The method of 13, further comprising:

using the over-pressure protection means to locate a location of a blockage, wherein the blockage causes the one or more fluid paths to be over-pressurized.