Transfer dispensers for assay devices

1. A device comprising:

a) a transfer dispenser having a multiplicity of cavities wherein each cavity has an opening diameter and is configured to reversibly hold only a single bead, and

b) an assay device which comprises a multiplicity of wells, wherein the assay device and the transfer dispenser are configured to fit onto or mate with each other, with a gap being present between said assay device and said transfer device, and wherein the cavities of the transfer dispenser are aligned with the wells of the device when the assay device and the transfer dispenser are fitted onto or mated with each other;

wherein each well has an opening diameter that is larger than the opening diameter of each of said cavities such that, when each cavity is placed over each well, a containment space is formed comprising said cavity and said well;

wherein the single bead is released from the cavity through said containment space and deposited into said well;

wherein the beads are non-magnetic beads,

wherein said gap has a size that is smaller than a size of the bead being transferred within the device, and

wherein the transfer dispenser is configured to be inverted relative to the assay device.

2. The device of claim 1 , wherein the transfer dispenser further comprises a locking mechanism that allows the transfer dispenser and the assay device to be locked into proper alignment.

3. The device of claim 1 , wherein a diameter of the each of the cavities is reversibly expandable to accommodate the bead.

4. The device of claim 1 , wherein a diameter of each of the cavities is at least 100.1% of the diameter of the bead, either in the native or expanded form to accommodate the bead.

5. The device of claim 1 , wherein a depth of each of the cavities is at least 50% of the size of the bead up to about 125% of the size of the bead.

6. The device of claim 1 , wherein the transfer dispenser is under the assay device.

7. The device of claim 6 , wherein the transfer dispenser is over said assay device.

8. The device of claim 1 , wherein the single bead is a size excluded bead such that the size of said bead excludes beads having a size that result in two beads fitting into a single cavity.

9. The device of claim 1 , wherein the beads flow in a partially horizontal direction allowing the beads to fill the cavities.

10. The device of claim 1 , wherein the beads have a size of from about 0.5 to about 100 microns.

11. The device of claim 1 , wherein said device comprises the transfer dispenser having fitted thereon said assay device, and

wherein said transfer dispenser is positioned below and aligned to the assay device in an inverted position such that each cavity in the transfer dispenser is aligned to a single well in the assay device provided that said transfer dispenser contains no more than a single bead in a given cavity.

12. The device of claim 1 , wherein said device comprises the transfer dispenser having fitted thereto said assay device, and

wherein said assay device is positioned below and aligned to the transfer dispenser such that each well in the assay device comprises a single bead, which is transferred from said transfer dispenser, and said transfer requires a single fitting of the assay device to the transfer dispenser.

13. A device comprising:

a) a transfer dispenser having a multiplicity of cavities wherein each cavity has a opening diameter and is configured to reversibly hold only a single bead, and

b) an assay device which comprises a multiplicity of wells, wherein the assay device and the transfer dispenser are configured to fit onto or mate with each other, optionally with a gap being present between said assay device and said transfer device, and wherein the cavities of the transfer dispenser are aligned with the wells of the device when the assay device and the transfer dispenser are fitted onto or mated with each other;

wherein each well has an opening diameter that is larger than the opening diameter of each of said cavities such that, when each cavity is placed over each well, a containment space is formed comprising said cavity and said well;

wherein the single bead is released from the cavity through said containment space and deposited into said well;

wherein the beads are non-magnetic beads;

wherein said gap when present has a size that is smaller than a size of the bead being transferred within the device, and

wherein the transfer dispenser is configured to be inverted relative to the assay device.

14. The device of claim 13 , wherein the device further comprises a locking mechanism that allows the transfer dispenser and the assay device to be locked into proper alignment.

15. The device of claim 13 , wherein a diameter of each of the cavities is reversibly expandable to accommodate the bead.

16. The device of claim 13 , wherein a diameter of each of the cavities is at least 100.1% of the diameter of the bead, either in the native or expanded form to accommodate the bead.

17. The device of claim 13 , wherein a depth of each of the cavities is at least 50% of the size of the bead up to about 125% of the size of the bead.

18. The device of claim 13 , wherein the transfer dispenser is under the assay device.

19. The device of claim 18 , wherein the transfer dispenser is over said assay device.

20. The device of claim 13 , wherein the single bead is a size excluded bead such that the size of said bead excludes beads having a size that result in two beads fitting into a single cavity.

21. The device of claim 13 , wherein the beads flow in a partially horizontal direction allowing the beads to fill the cavities.

22. The device of claim 13 , wherein the beads have a size of from about 0.5 to about 100 microns.

23. The device of claim 13 , wherein said device comprises the transfer dispenser having fitted thereon said assay device, and

wherein said transfer dispenser is positioned below and aligned to the assay device in an inverted position such that each cavity in the transfer dispenser is aligned to a single well in the assay device provided that said transfer dispenser contains no more than a single bead in a given cavity.

24. The device of claim 13 , wherein said device comprises the transfer dispenser having fitted thereto said assay device, and

wherein said assay device is positioned below and aligned to the transfer dispenser such that each well in the assay device comprises a single bead, which is transferred from said transfer dispenser, and said transfer requires a single fitting of the assay device to the transfer dispenser.

25. A device comprising:

a) a transfer dispenser having a multiplicity of cavities wherein each cavity has an opening diameter and is configured to reversibly hold only a single bead, and

b) an assay device which comprises a multiplicity of wells, wherein the assay device and the transfer dispenser are configured to fit onto or mate with each other, and wherein the cavities of the transfer dispenser are aligned with the wells of the device when the assay device and the transfer dispenser are fitted onto or mated with each other;

wherein each well has an opening diameter that is larger than the opening diameter of each of said cavities such that, when each cavity is placed over each well, a containment space is formed comprising said cavity and said well;

wherein the single bead is released from the cavity through said containment space and deposited into said well;

wherein the beads are non-magnetic beads;

wherein the transfer dispenser and the assay device are in direct contact with each other, and

wherein the transfer dispenser is configured to be inverted relative to the assay device.

26. The device of claim 25 , wherein the single bead is a size excluded bead such that the size of said bead excludes beads having a size that result in two beads fitting into a single cavity.

27. The device of claim 25 , wherein the beads have a size of from about 0.5 to about 100 microns.

28. The device of claim 25 , wherein said device comprises the transfer dispenser having fitted thereon said assay device, and

wherein said transfer dispenser is positioned below and aligned to the assay device in an inverted position such that each cavity in the transfer dispenser is aligned to a single well in the assay device provided that said transfer dispenser contains no more than a single bead in a given cavity.

29. The device of claim 25 , wherein said device comprises the transfer dispenser having fitted thereto said assay device, and

wherein said assay device is positioned below and aligned to the transfer dispenser such that each well in the assay device comprises a single bead, which is transferred from said transfer dispenser, and said transfer requires a single fitting of the assay device to the transfer dispenser.