Apparatus and method for a precision flow assay

• US 20060078471A1
• Filed: 11/16/2004
• Published: 04/13/2006
• Est. Priority Date: 10/12/2004
• Status: Abandoned Application

• Current Assignee: FasTraq, Inc. (Quantech Ltd.)
• Original Assignee: FasTraq, Inc. (Quantech Ltd.)
• Inventors: Witty, Thomas R., Case, Robert, Castanon, Scott
• Application Number:
  US10/991,331
• Publication Number:
  US 20060078471A1
• Time in Patent Office: Days
• US Class Current: 422/100
• CPC Class Codes: B01F 25/10 Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
• CPC Class Codes: B01F 33/3017 Mixing chamber
• CPC Class Codes: B01L 2200/026 Fluid interfacing between devices or objects, e.g. connectors, inlet details
• CPC Class Codes: B01L 2300/0825 Test strips
• CPC Class Codes: B01L 2300/0867 Multiple inlets and one sample wells, e.g. mixing, dilution
• CPC Class Codes: B01L 2300/0877 Flow chambers
• CPC Class Codes: B01L 2400/0487 fluid pressure, pneumatics
• CPC Class Codes: B01L 3/50273 characterised by the means or forces applied to move the fluids micropumps F04B19/006, of the membrane type F04B43/043
• CPC Class Codes: B01L 3/502746 characterised by the means for controlling flow resistance, e.g. flow controllers, baffles B01L3/502738 takes precedence
• CPC Class Codes: G01N 21/05 Flow-through cuvettes G01N21/09 takes precedence; handling fluid samples G01N1/10
• CPC Class Codes: G01N 35/1095 for supplying the samples to flow-through analysers for a specific analyser see relevant groups, e.g. under G01N15/00, G01N21/00, G01N27/00, G01N30/00, H01J49/00

Abstract

An apparatus is provided for testing fluid samples includes a sensor, which can be light source, directed to a flow cell and a photo sensor for detecting a light beam reflected from the flow cell. The photo sensor monitors the fluid in the flow cell by sensing the reflected light beam from the flow cell, thereby monitoring the test process. The flow cell has a flow channel the allows fluid sample to flow at a rate where sufficient incubation of the fluid will occur before the fluid enters an area where analyte levels will be detected.

Claims

1. A flow cell configured to be fluidly coupled to a fluid moving source and for use with a monitor device, the flow cell comprising:

a housing;

a mixing chamber;

a flow channel sized to provide for movement of liquid from the mixing chamber by non-capillary action; and

a matrix positioned at a distal end of the flow channel, the matrix containing a compound that will react with the sample to create a change detectable by the monitor device, wherein a fluid path extends from the mixing chamber to the flow channel and to the matrix to bring sample fluid to the matrix for detection of analyte levels therein.

2. The flow cell of claim 1, wherein the mixing chamber is configured to produce a substantially homogenation of label and diluent.

3. The flow cell of claim 2, wherein the diluent is a sample.

4. The flow cell of claim 3, wherein the sample is a fluid.

5. The flow cell of claim 3, wherein the sample is a patient sample indicative of at least one, cardiac, fertility, kidney, coagulation, electrolyte and hematology panel, molecular diagnostics and chemistry panels.

6. The flow cell of claim 1, wherein the flow channel provides a control variation of no more than <

10% in flow.

7. The flow cell of claim 1, wherein the matrix is selected from at least one of a polymer surface, a treated polymer surface and a pad.

8. The flow cell of claim 1, wherein the matrix includes a solubilation enhancer.

9. The flow cell of claim 8, wherein the solubilation enhancer is included to facilitate resolution.

10. The flow cell of claim 8, wherein the solubilation enhancer is included to facilitate mixing.

11. The flow cell of claim 8, wherein the solubilation enhancer is selected from at least one of a sugar and surfactant.

12. The flow cell of claim 8, wherein the solubilation enhancer improves stabilization of the label.

13. The flow cell of claim 1, wherein the fluid moving source provides fluid movement by at least one of, pumping, gravity, centrifugal force and pneumatic.

14. The flow cell of claim 1, wherein the monitoring device includes the energy source is selected from, light, RF, ultra-sound, resistive heating, magnetic field and chemical activation.

15. The flow cell of claim 1, wherein the monitoring device includes a sensor.

16. The flow cell of claim 15, wherein the sensor is selected from, a wavelength dependent light detection device, an intensity of light detection device, a perturbation of a magnetic field device and a light emission intensity or duration device

17. The flow cell of claim 1, wherein the monitoring device includes the energy source and the sensor.

18. The flow cell of claim 1, wherein the monitoring device directly monitors a progress of events inside a measurement chamber.

19. The flow cell of claim 18, wherein the events include, entrance of a first solution and displacement of the first solution by wash or second reactive solution.

20. The flow cell of claim 1, wherein the output is light intensity.

21. The flow cell of claim 1, wherein the output is a measurement of wavelength.

22. The flow cell of claim 1, wherein the mixing chamber contains dry reagent.

23. The flow cell of claim 1, wherein the fluid moving source flows fluid along the flow path at a rate sufficient to allow a desired incubation of the sample in the flow channel prior to reaching the matrix.

24. The flow cell of claim 1, wherein the mixing chamber provides turbulent flow.

25. The flow cell of claim 1, wherein the mixing chamber provides at least partial blockage of flow in the flow path of a fluid.

26. The flow cell of claim 1, wherein the mixing chamber is a vortex.

27. The flow cell of claim 1, wherein a dry reagent is on a wall of the mixing chamber.

28. The flow cell of claim 27, wherein the dry agent is sprayed on the wall of the mixing chamber.

29. The flow cell of claim 1, wherein immobilized antibody is located in an immobilized antibody chamber.

30. The flow cell of claim 1 further comprising a sample overflow chamber to receive fluid that has flowed through the area with immobilized antibody, wherein the sample overflow chamber is coupled to the mixing chamber.

31. The flow cell of claim 1, wherein the flow cell is mounted in a larger cartridge.

32. The flow cell of claim 1, wherein the flow cell is coupled to at least one reservoir with a sealed flow path.

33. The flow cell of claim 1, wherein the flow cell is coupled to a reagent or sample reservoir.

34. The flow cell of claim 1, wherein the mixing chamber is located outside of the flow cell.

35. The flow cell of claim 1, wherein the flow channel is sized so that no capillary action will act on fluid that contacts the channel.

36. The flow cell of claim 1, wherein flow through the flow channel is at a rate slower than flow through the mixing chamber.

37. The flow cell of claim 1, wherein flow through the flow channel is at a rate faster than flow through the mixing chamber.

38. The flow cell of claim 1, wherein fluid continues to flow until all label in the mixing chamber is used.

39. The flow cell of claim 1, wherein the fluid moving source draws fluid into the flow cell.

40. The flow cell of claim 1, the fluid delivery device advances fluid into the flow channel.

41. The flow cell of claim 1, wherein when analytes are detected, fluorescence occurs at an area where fluid enters the matrix.

42. A flow cell configured to be fluidly coupled to a fluid moving source and for use with a monitor device, the flow cell comprising:

a housing;

a mixing chamber;

a flow channel; and

a matrix positioned in the mixing chamber;

wherein a fluid path extends from the mixing chamber to the flow channel and the flow channel is sized to provide for non-capillary fluid flow.

43. A test device, comprising:

a non-microporous mixing chamber;

a flow channel coupled to the mixing chamber;

a matrix in fluid communication with the flow channel, the matrix containing a compound that will react with the sample to create a change detectable by a monitor device, wherein a fluid path extends from the mixing chamber to the flow channel and to the matrix to bring sample fluid to the matrix for detection of analyte levels.

44. The device of claim 43, wherein the non-micorporous mixing chamber provides turbulent flow of fluid in the non-microporous mixing chamber.

45. The device of claim 43, wherein a dry porous carrier is mixed with the sample in the non-microporous mixing chamber.

46. The device of claim 43, further comprising:

a labelled specific binding reagent and an unlabeled specific binding reagent.

47. The device of claim 46, wherein the labeled and unlabelled specific binding reagents are capable of participating in either a sandwich reaction or a competition reaction in the presence of the analyte.