Diagnostic Devices

• US 20110189791A1
• Filed: 11/23/2010
• Published: 08/04/2011
• Est. Priority Date: 10/11/2002
• Status: Active Grant

• Current Assignee: ZBx Corporation (NOWDiagnostics, Inc.)
• Original Assignee: ZBx Corporation (NOWDiagnostics, Inc.)
• Inventors: Shi, Qinwei
• Granted Patent: US 8,349,618 B2
• Time in Patent Office: Days
• US Class Current: 436/501
• CPC Class Codes: B01L 2300/0825 Test strips
• CPC Class Codes: B01L 2300/161 Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
• CPC Class Codes: B01L 3/5023 with a sample being transported to, and subsequently stored in an absorbent for analysis
• CPC Class Codes: G01N 33/54388 based on lateral flow
• CPC Class Codes: G01N 33/558 using diffusion or migration of antigen or antibody immunochromatographic test strips G01N33/54387

Abstract

The present invention relates to analytical methods, platforms, and devices for the rapid and efficient immunochromatic determination of one or more components in fluid samples.

Claims

1. A platform comprising one or more dry porous membranes for detecting at least one component in a liquid sample, wherein:

the platform is formed from top and bottom layers comprising respective top and bottom hydrophilic surfaces that are brought into fixed face to face contact to enclose and position the membranes and form a platform flow channel and a sample application means; and

the platform flow channel is in fluid communication with the membranes and is configured to promote increased capillary force and uniform flow of the sample by capillary action in a continuous pathway from the upstream sample application means through the platform flow channel and then to an edge of an upstream end of the membranes towards the distal end of said membranes.

2. The platform according to claim 1 wherein the platform flow channel has an indent in the bottom surface of the top layer.

3. The platform according to claim 1 in which the platform flow channel is formed in the top surface of the bottom layer.

4. The platform according to claim 1 in which the platform flow channel is formed with indents in the top surface of the bottom layer and in the bottom surface of the top layer.

5. The platform according to claim 1 further comprising a window in the top layer for observing the results of a reaction which takes place in the membrane.

6. The platform according to claim 1 wherein the membrane contains one or more reagent[s] for detecting one or more analyte[s].

7. The platform according to claim 6 wherein the analyte is selected from the group consisting of hCG, LH, PSA, Myoglobin, Troponin I, Troponin T, Creatinine Kinase MB, C Reactive Protein, ApoB 100, and Brain Natriuretic Peptide.

17. The platform of claim 1, wherein said top and bottom layers further comprise open areas to inhibit the flow of the sample from said platform flow channel into space between the surfaces of said top and bottom layers.

18. The platform of claim 1, wherein said top surface of the bottom layer further comprises indents that mate with rectangular protrusions in said bottom surface of the top layer.

19. The platform of claim 1, wherein said top surface of the bottom layer further comprises cylindrical pillars that register with cylindrical indents in said bottom surface of the top layer.

20. A method for detecting at least one component in a liquid sample, the method comprising:

applying the sample to the platform of claim 1 such that the sample flows in a continuous pathway from the upstream sample application means through the platform flow channel and then to an edge of an upstream end of the membranes towards the distal end of said membranes; and

detecting the presence or absence of the component by reading a result near the distal end of said membranes.

8. A platform comprising a detection membrane and a capture membrane for rapid and efficient detection of one or more components in a whole blood sample, wherein:

the detection membrane is constructed to filter substantially all of the red blood cells from the sample and contains a mobile labeled detecting reagent which will react with the one or more components to form a reaction product which moves downstream in the detection membrane;

the capture membrane is downstream of the detection membrane and contains a fixed, immobile capture reagent which reacts with and concentrates the reaction product at a capture line, the downstream end of the detection membrane overlapping the upstream end of the capture membrane;

the platform is formed from top and bottom layers comprising respective top and bottom hydrophilic surfaces that are brought into fixed face to face contact to enclose and position the membranes and form a platform flow channel and a sample application means; and

the platform flow channel is in fluid communication with the membranes and is configured to promote increased capillary force and uniform flow of the sample by capillary action in a continuous pathway from the upstream sample application means through the platform flow channel and then to an edge of the upstream end of the detection membrane towards the downstream end of the capture membrane.

9. The platform according to claim 8 wherein the platform flow channel has an indent in the bottom surface of the top layer.

10. The platform according to claim 8 in which the platform flow channel is formed with an indent in the top surface of the bottom layer.

11. The platform according to claim 8 in which the platform flow channel is formed with indents in the top surface of the bottom layer and bottom surface of the top layer.

12. The platform according to claim 8 further comprising a window in the top layer for observation of the results of a reaction which takes place in the capture membrane.

13. The platform according to claim 8 wherein the detection membrane contains one or more reagent[s] for detecting one or more analyte[s].

14. The platform according to claim 13 wherein the analyte is selected from the group consisting of hCG, LH, PSA, Myoglobin, Troponin I, Creatinine Kinase MB, C Reactive Protein, ApoB 100, and Brain Natriuretic Peptide.

15. The platform according to claim 8 wherein the detecting membrane is a glass fibre membrane and the capture membrane is a nitrocellulose membrane.

16. The platform according to claim 8 wherein the membranes are covered with a transparent cover layer.