Dry slide assay using reduced reading window

Patent metadata

Field	Value
Publication number	US-11293879-B2
Application number	US-201916458474-A
Country	US
Kind code	B2
Filing date	Jul 1, 2019
Priority date	Jul 2, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

The present disclosure is directed to a method and apparatus for performing an assay on a dry slide or other solid media using a reduced reading window. In an embodiment, method of performing at least one assay comprises obtaining an image of a fluid sample located on a dry slide, positioning a reading window to correspond to an area of the fluid sample in the image, determining an interference area within the reading window based on light intensity, reducing the reading window to eliminate the interference area from the reading window, and performing at least one assay using the reduced reading window.

First claim

The invention is claimed as follows:

1. A method of performing at least one assay comprising:
obtaining, in a processor of a control unit, an image of a fluid sample located on a dry slide;
positioning, via the processor of the control unit, a reading window to correspond to an area of the fluid sample in the image;
determining, via the processor of the control unit, an interference area within the reading window based on light intensity;
reducing, via the processor of the control unit, the reading window to eliminate the interference area from the reading window; and
performing, via the control unit, at least one assay using the reduced reading window.

2. The method of claim 1 , wherein reducing the reading window includes reducing the reading window to a predetermined shape.

3. The method of claim 2 , wherein reducing the reading window includes reducing the reading window to a crescent shape.

4. The method of claim 3 , wherein reducing the reading window includes reducing the reading window from a circular shape to the crescent shape.

5. The method of claim 1 , wherein the reading window has an initial area, and wherein reducing the reading window includes reducing the reading window to a predetermined area less than the initial area.

6. The method of claim 1 , which includes dispensing a washing fluid onto the fluid sample on the dry slide, wherein the interference area is caused by the washing fluid.

7. The method of claim 6 , wherein the interference area is caused by fluid stagnation resulting from dispensing the washing fluid.

8. A method of performing at least one assay comprising:
dispensing a fluid sample on a dry slide;
dispensing a washing fluid onto the fluid sample on the dry slide;
obtaining, via a processor of a control unit, an image of the dry slide;
positioning, via the processor of the control unit, a reading window to correspond to an area of the fluid sample in the image;
reducing, via the processor of the control unit, the reading window to exclude an interference area caused by the washing fluid; and
performing, via the control unit, at least one assay using the reduced reading window.

9. The method of claim 8 , which includes determining the interference area within the reading window based on a known dispense location of the washing fluid.

10. The method of claim 8 , wherein reducing the reading window includes reducing the reading window to a predetermined shape.

11. The method of claim 10 , wherein reducing the reading window includes reducing the reading window to a crescent shape.

12. The method of claim 11 , wherein reducing the reading window includes reducing the reading window from a circular shape to the crescent shape.

13. The method of claim 8 , wherein the reading window has an initial area, and wherein reducing the reading window includes reducing the reading window to a predetermined area less than the initial area.

14. The method of claim 8 , wherein the interference area is caused by fluid stagnation resulting from dispensing the washing fluid.

15. An apparatus for performing at least one assay comprising:
a slide reception location configured to receive at least one dry slide having a fluid sample located thereon;
a dispenser configured to dispense a washing fluid onto the fluid sample on the at least one dry slide; and
a control unit configured to: (i) obtain an image of the fluid sample on the at least one dry slide; (ii) position a reading window to correspond to an area of the fluid sample in the image; (iii) reduce the reading window to exclude an interference area caused by the washing fluid; and (iv) perform at least one assay using the reduced reading window.

16. The apparatus of claim 15 , wherein the control unit is configured to determine the interference area within the reading window based on a known dispense location of the washing fluid.

17. The apparatus of claim 15 , wherein the control unit is configured to reduce the reading window to a predetermined shape.

18. The apparatus of claim 15 , wherein the control unit is configured to reduce the reading window from a circular shape to a crescent shape.

19. The apparatus of claim 15 , wherein the control unit is configured to reduce the reading window to a predetermined area.

20. The apparatus of claim 15 , wherein the interference area is caused by fluid stagnation resulting from the washing fluid being dispensed onto the at least one dry slide.

Assignees

• Ortho Clinical Diagnostics Inc

Inventors

• Ding Zhong
• Kirsch Andrew M
• Scalice Edward R
• Wojtasiewicz Benjamin

Classifications

• G01N2021/0389

  Windows · CPC title

• G01N21/77

  by observing the effect on a chemical indicator · CPC title

• G01N2021/0106

  General arrangement of respective parts · CPC title

• G01N21/01

  Arrangements or apparatus for facilitating the optical investigation · CPC title

• G01N21/93 Primary

  Detection standards; Calibrating {baseline adjustment, drift correction} · CPC title