Well-less filtration device

• US 7,311,880 B2
• Filed: 06/11/2002
• Issued: 12/25/2007
• Est. Priority Date: 12/23/1999
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Perman, Craig A., Jacobson, Jason R.
• Primary Examiner(s): Warden, Jill
• Assistant Examiner(s): Levkovich, Natalia
• Application Number:
  US10/167,370
• Publication Number:
  US 20020155034A1
• Time in Patent Office: 2,023 Days
• Field of Search: 422/101, 422/267, 436/177, 436/436, 264/45.4, 264/45.1, 738/632.3, 210/773, 210/778, 210/323.1, 210/403, 210/295, 210/650, 210/653
• US Class Current: 422/69
• CPC Class Codes: B01L 2200/12 Specific details about manufacturing devices
• CPC Class Codes: B01L 3/50255 Multi-well filtration
• CPC Class Codes: Y10T 436/25375 Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
• CPC Class Codes: Y10T 436/255 including use of a solid sorbent, semipermeable membrane, or liquid extraction

Abstract

The present invention provides a well-less filtration device that includes a pre-filter layer; a support layer; and at least one layer of solid phase extraction medium disposed between the pre-filter layer and the support layer. At least a portion of the pre-filter layer, support layer and solid phase extraction medium are ultrasonically welded together to form a pattern of filter cells and land areas with the land areas being disposed between the filter cells. The filter cells of the device may be arranged to conform to a standardized array format.

Claims

1. A well-less filtration device comprising:

a pre-filter layer;

a support layer; and

at least one layer of solid phase extraction medium disposed between the pre-filter layer and the support layer;

wherein at least a portion of the pre-filter layer and the support layer are ultrasonically welded together to form a pattern of;

filter cells that enclose the solid phase extraction medium and having the prefilter layer and porous support layer consolidated at the periphery of each filter cell, thereby forming

compressed land areas disposed between and isolating adjacent filter cells.

2. The device of claim 1 wherein the solid phase extraction medium comprises fibers, particulate material, a membrane, or a combination thereof.

3. The device of claim 2 wherein the solid phase extraction medium comprises sorptive particle enmeshed within a fibril matrix.

4. The device of claim 3 wherein the sorptive particles comprise silica-based particles, resin polymers, chelating particles, or ion exchange particles.

5. The device of claim 4 wherein the particles comprise polypyrrole.

6. The device of claim 3 wherein the sorptive particles are derivatized with hydrocarbon chains, styrenedivinylbenzene, at least one ligand, or a combination thereof.

7. The device of claim 6 wherein the ligand specifically binds a known biological molecule.

8. The device of claim 7 wherein the ligand comprises an antibody.

9. The device of claim 6 wherein the sorptive particles are derivatized to include azlactone groups.

10. The device of claim 1 wherein the solid phase extraction medium comprises a melt blown microfiber web, a spunbound web, a woven fabric, a knitted fabric, a microporous film, or a glass fiber fabric.

11. The device of claim 1 wherein the pre-filter layer comprises a porous material.

12. The device of claim 11 wherein the porous material comprises a nonwoven web.

13. The device of claim 12 wherein the nonwoven comprises melt blown polypropylene fibers.

14. The device of claim 1 wherein the support layer comprises a porous material.

15. The device of claim 1 wherein the pattern of filter cells and land areas comprises at least 48 filter cells.

16. The device of claim 15 wherein the pattern of filter cells and land areas comprises at least 96 filter cells.

17. The device of claim 16 wherein the pattern of filter cells and land areas comprises at least 384 filter cells.