Devices and methods for handling and processing punches

• US 20060182657A1
• Filed: 02/10/2006
• Published: 08/17/2006
• Est. Priority Date: 02/11/2005
• Status: Abandoned Application

• Current Assignee: Whatman, Inc. (GE Healthcare Technologies, Inc.)
• Original Assignee: Whatman, Inc. (GE Healthcare Technologies, Inc.)
• Inventors: Pathirana, Navin Deepal, Tortorella, Stevan Paul
• Application Number:
  US11/352,707
• Publication Number:
  US 20060182657A1
• Time in Patent Office: Days
• US Class Current: 422/63
• CPC Class Codes: B01L 2300/0618 for removable separation walls
• CPC Class Codes: B01L 2300/0681 Filter
• CPC Class Codes: B01L 2300/0838 Capillaries
• CPC Class Codes: B01L 3/0275 Interchangeable or disposable dispensing tips
• CPC Class Codes: B01L 3/502 with fluid transport, e.g. in multi-compartment structures centrifugal-type cuvettes G01N21/07; analysis by separation into components G01N30/00; automatic analysers G01N35/00
• CPC Class Codes: G01N 1/04 in the solid state, e.g. by cutting
• CPC Class Codes: G01N 1/286 involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising microtomes G01N1/06; pulverising in general B02C; mixing in general B01F
• CPC Class Codes: G01N 2001/288 Filter punches

Abstract

The present invention provides devices and methods for handling and processing a filter or other matrix punch comprising a sample of interest in order to prevent loss of the punch and to improve ease of handling. In one aspect, the present invention provides a device comprising a first element, which holds a punch, coupled to a second element, which contributes to holding the punch in the first element, with reservoirs above and below the punch. The devices and methods can be used manually in single-channel and multi-channel formats or can be used in an automated processor, such as a robotic processor. Kits are also provided.

Claims

1. A device for processing a punch from a matrix comprising a sample of interest, wherein the device comprises:

a. a first element comprising a dispensing tip comprising;

i. a hollow internal shaft having an external opening; and

ii. a first housing assembly structured and arranged to define a first inner reservoir communicating with the internal shaft of the dispensing tip, wherein the dimensions of the first inner reservoir are selected such that a punch inserted therein divides the first inner reservoir into two chambers, wherein;

the first chamber communicates with the internal shaft of the dispensing tip; and

the second chamber comprises a coupling opening; and

b. a second element comprising a second housing assembly structured and arranged to define;

i. a hollow interior;

ii. a coupling portion for engaging the second element to the first element; and

iii. a second coupling opening for communication through the first coupling opening of the first element, between the hollow interior of the second element and the first inner reservoir, wherein the dimensions of the second housing assembly are selected such that, when a punch is positioned in the first inner reservoir of the first element, the rim defining the second coupling opening contributes to maintain the position of the punch within the first inner reservoir and forms a second inner reservoir within the hollow interior of the second element.

2. The device of claim 1, wherein the first inner reservoir further comprises a punch support, wherein the dimensions of the punch support are selected such that most of the surface area of the punch placed on the punch support is accessible to a fluid in the first chamber when a punch is placed on the punch support and the first chamber is filled with the fluid.

3. The device of claim 2, wherein the punch support comprises an O-ring.

4. The device of claim 2, wherein the punch support comprises a ribbed support with a series of channels for fluid flow.

5. The device of any one of the preceding claims, wherein the coupling portion engages the second element to the first element by a pressure lock.

6. The device of any one of the preceding claims, wherein the coupling portion engages the second element to the first element by mechanical locking mechanism.

7. The device of claim 6, wherein the mechanical locking mechanism comprises a snap fitting or a Luer lock.

8. The device of any one of the preceding claims, wherein the first inner reservoir is contiguous with the hollow inner shaft within the first housing assembly.

9. The device of any one of the preceding claims, wherein the dispensing tip of the first element comprises a micro-dispensing pipet tip.

10. The device of claim 9, wherein the micro-dispensing pipet tip comprises a capillary micro-dispensing pipet tip.

11. The device of any one of the preceding claims, wherein the second element comprises a micro-dispensing pipet tip.

12. The device of any one of the preceding claims, wherein the device is adapted for use with a micro-dispensing pipet selected from the group consisting of:

d. a single-channel micro-dispensing pipet;

e. a multi-channel micro-dispensing pipet; and

f. an automated micro-dispensing pipet machine or robot.

13. The device of claim 1, wherein the second element comprises a syringe selected from the group consisting of:

a. a manual syringe; and

b. a robotic syringe.

14. The device of claim 13, wherein the first element is adapted to be fitted onto a syringe, wherein the hollow internal shaft is housed in a syringe needle.

15. The device of claim 14, wherein the first housing assembly is adapted to be fitted between a syringe and a syringe needle.

16. The device of any one of the preceding claims, further comprising:

c. a heating element.

17. A kit for processing a punch from a matrix comprising a sample of interest, wherein the kit comprises:

b. the device of any one of the preceding claims; and

b. a processing reagent.

18. The kit of claim 17, wherein the processing reagent comprises an elution buffer.

19. The kit of claim 18, wherein the elution buffer is selected from the group consisting of NaOH, sodium acetate, 10 mM 2-[N-morpholino]-ethanesulfonic acid (MES), 10 mM 3-[cyclohexylamino]-1-propanesulfonic acid (CAPS), TE, TE⁻

1, sodium dodecyl sulfate (SDS), an aqueous solution of sorbitan mono-9octadecenoate poly(oxy-1,1-ethanedlyl), lauryl dodecyl sulfate (LDS), or t-octylphenoxypolyethoxyethanol, 10 mM Tris, phosphate buffered saline (PBS), and water.

20. The kit of claim 17, wherein the processing reagent comprises an indicator.

21. The kit of claim 17, wherein the processing reagent comprises an enzyme or a photolytic agent.

22. The kit of claim 17, further comprising:

c. a heating element.

23. The kit of claim 17, further comprising:

c. a punch comprising a sample of interest.

24. The kit of claim 23, wherein the sample of interest comprises:

iv. a nucleic acid;

or

v. a protein or a peptide.

25. The kit of claim 24, wherein the sample of interest comprises a nucleic acid selected from the group consisting of genomic DNA, plasmid DNA, mitochrondrial DNA, cDNA, an oligonucleotide, viral DNA or RNA, BAC, mRNA, rRNA, tRNA, siRNA, and total RNA.

26. A method of processing a punch from a matrix comprising a sample of interest, wherein the method comprises:

vi. punching a matrix to yield a punch comprising a sample of interest;

vii. providing the device of any one of the preceding claims;

viii. inserting the matrix into the first housing assembly of the first element of the device;

ix. coupling the first element to the second element;

x. processing the punch with a processing reagent.

27. The method of claim 26, wherein the processing step comprises:

xi. drawing the processing reagent into the first element so that the processing reagent contacts the punch;

xii. removing the processing reagent from the first element.

28. The method of claim 26, wherein the processing step comprises:

a. drawing the processing reagent into the first element so that the processing reagent contacts the punch and moves past it into the second chamber;

b. pushing the processing reagent through the punch into the first chamber;

c. removing the processing reagent from the first element.

29. The method of claim 27 or claim 28, wherein step i. further comprises incubation of the punch.

30. The method of any one of claims 26-28, wherein the coupling step comprises locking by pressure or by a mechanical lock.

31. The method of any one of claims 26-28, wherein the processing reagent comprises an elution buffer.

32. The method of claim 31, wherein the elution buffer is selected from the group consisting of NaOH, sodium acetate, 10 mM 2-[N-morpholino]-ethanesulfonic acid (MES), 10 mM 3-[cyclohexylamino]-1-propanesulfonic acid (CAPS), TE, TE⁻

1, sodium dodecyl sulfate (SDS), an aqueous solution of sorbitan mono-9octadecenoate poly(oxy-1,1-ethanedlyl), lauryl dodecyl sulfate (LDS), or t-octylphenoxypolyethoxyethanol, 10 mM Tris, phosphate buffered saline (PBS), and water.

33. The method of claim 31, wherein the elution buffer is heated to a temperature of between 40°

C. to 125°

C., wherein;

a. the elution buffer is heated prior to contact with the punch;

or

b. the elution buffer is heated during contact with the punch in the first housing assembly.

34. The method of claim 31, wherein the elution buffer is heated to a temperature of between 65°

C. and 95°

C.

35. The method of any one of claims 26-28, wherein the processing reagent comprises an indicator.

36. The method of any one of claims 26-28, wherein the processing reagent comprises an enzyme or a photolytic agent.

37. The method of any one of claims 26-28, wherein the sample of interest comprises a nucleic acid.

38. The method of claim 37, wherein the nucleic acid is selected from the group consisting of genomic DNA, plasmid DNA, mitochrondrial DNA, cDNA, an oligonucleotide, BAC, viral DNA or RNA, BAC, mRNA, rRNA, tRNA, siRNA, and total RNA.

39. The method of any one of claims 26-28, wherein the sample of interest comprises a protein or a peptide.

40. The method of any one of claims 26-28, wherein the matrix comprises:

a. a cellulose-based matrix;

b. a silica-based matrix;

or

xiii. a plastics-based matrix.