MEMS filter module

• US 20050184003A1
• Filed: 08/04/2004
• Published: 08/25/2005
• Est. Priority Date: 02/24/2004
• Status: Active Grant

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Sniegowski, Jeffry J., Rodgers, M. Steven, McWhorter, Paul J.
• Granted Patent: US 7,226,540 B2
• Time in Patent Office: Days
• US Class Current: 210/321.750
• CPC Class Codes: B01D 2313/08 Flow guidance means within the module or the apparatus
• CPC Class Codes: B01D 2313/10 Specific supply elements
• CPC Class Codes: B01D 2313/12 Specific discharge elements
• CPC Class Codes: B01D 2313/14 Specific spacers
• CPC Class Codes: B01D 61/18 Apparatus therefor
• CPC Class Codes: B01D 63/081 Manufacturing thereof
• CPC Class Codes: B01D 63/088 Microfluidic devices comprising semi-permeable flat membranes
• CPC Class Codes: B01D 67/0062 by micromachining techniques, e.g. using masking and etching steps, photolithography
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

Various MEMS filter elements or modules are disclosed. One such MEMS filter module (34) includes a first film (70) and a second film (46) that are spaced and interconnected by a plurality of supports (78). A plurality of first flow ports (74) extend through the first film (70), and a plurality of second flow ports (50) extend through the second film (46). A plurality of annular filter walls (54) extend from the second film (46) toward the first film (70), and are separated therefrom by a filter trap gap (58). A filter trap chamber (62) is disposed on each side of each filter trap gap (58). Therefore, fluid will flow into one filter trap chamber (62), through a filter trap gap (58), and into another filter trap chamber (62), whether the flow is introduced into the filter module (34) through the first flow ports (74) or the second flow ports (50).

Claims

1. A filter module, comprising:

a first film comprising a plurality of first flow ports;

a second film comprising a plurality of second flow ports, wherein said second film is spaced from said first film;

a plurality of filter walls that are disposed in spaced relation on said second film, that extend from said second film toward said first film, and that are of an annular extent in a plan view of a surface of said second film from which said plurality of filter walls extend, wherein a gap between each said filter wall and said first film defines a filter trap that is thereby also of an annular extent;

a first annular seal extending between said first and second films;

a filtering region bounded by said first annular seal, wherein all of said filter walls, said filter traps, said first flow ports, and said second flow ports are located in said filtering region; and

a plurality of supports extending between said first and second films in said filtering region.

2. A filter module, as claimed in claim 1, wherein:

said first film and said second film each have a maximum thickness of about 10 microns.

3. A filter module, as claimed in claim 1, wherein:

said first and second films define opposing extremes of said filter module.

4. A filter module, as claimed in claim 1, further comprising:

a first chamber fluidly connected with at least one of said first flow ports; and

a second chamber fluidly connected with at least one of said second flow ports, wherein said filter trap fluidly interconnects said first and second chambers.

5. A filter module, as claimed in claim 1, wherein:

each of said plurality of filter walls may be of any shape in said plan view to define said annular extent of said plurality of filter walls.

6. A filter module, as claimed in claim 1, wherein:

each of said plurality of filter walls terminates prior to reaching a surface of said first film that faces said second film.

7. A filter module, as claimed in claim 1, wherein:

an area defined by projecting each of said plurality of filter walls onto said first film fails to encompass any of said first flow ports.

8. A filter module, as claimed in claim 1, wherein:

a number of said supports is no less than a number of said filter walls.

9. A filter module, as claimed in claim 1, wherein:

at least two said first flow ports and at least two said second flow ports are associated with each said filter trap.

10. A filter module, as claimed in claim 1, wherein:

a height of each said gap is about 0.3 microns.

11. A filter module, as claimed in claim 1, further comprising:

a second annular seal extending between said first and second films and disposed in spaced relation to said first annular seal, wherein said second annular seal is disposed outwardly of said first annular seal.

12. A filter comprising the filter module of claim 1 in a filter housing.

13. A filter module, comprising:

a first film comprising a plurality of first flow ports;

a second film comprising a plurality of second flow ports, wherein said second film is spaced from said first film;

a plurality of filter walls that are disposed in spaced relation on said second film and that extend from said second film toward said first film, wherein a gap between each said filter wall and said first film defines a filter trap;

a first annular seal extending between said first and second films;

a filtering region bounded by said first annular seal, wherein all of said filter walls, said filter traps, said first flow ports, and said second flow ports are located in said filtering region; and

a plurality of supports extending between said first and second films in said filtering region, wherein a number of said posts is no less than a number of said filter walls.

14. A filter module, as claimed in claim 13, wherein:

said first film and said second film each have a maximum thickness of about 10 microns.

15. A filter module, as claimed in claim 13, wherein:

said first and second films define opposing extremes of said filter module.

16. A filter module, as claimed in claim 13, further comprising:

a first chamber fluidly connected with at least one of said first flow ports; and

a second chamber fluidly connected with at least one of said second flow ports, wherein said filter trap fluidly interconnects said first and second chambers.

17. A filter module, as claimed in claim 13, wherein:

each of said plurality of filter walls are of an annular extent in a plan view of a surface of said second film from which said plurality of filter walls extend, wherein each filter trap is thereby also of an annular extent.

18. A filter module, as claimed in claim 17, wherein:

each of said plurality of filter walls may be of any shape in said plan view to define said annular extent of said plurality of filter walls.

19. A filter module, as claimed in claim 13, wherein:

each of said plurality of filter walls terminates prior to reaching a surface of said first film that faces said second film.

20. A filter module, as claimed in claim 13, wherein:

an area defined by projecting each of said plurality of filter walls onto said first film fails to encompass any of said first flow ports.

21. A filter module, as claimed in claim 13, wherein:

at least two said first flow ports and at least two said second flow ports are associated with each said filter trap.

22. A filter module, as claimed in claim 13, wherein:

a height of each said gap is about 0.3 microns.

23. A filter module, as claimed in claim 13, further comprising:

a second annular seal extending between said first and second films and disposed in spaced relation to said first annular seal, wherein said second annular seal is disposed outwardly of said first annular seal.

24. A filter comprising the filter module of claim 13 in a filter housing.

25. A filter module, comprising:

a first film comprising a plurality of first flow ports;

a second film comprising a plurality of second flow ports, wherein said second film is spaced from said first film;

a plurality of filter walls that are disposed in spaced relation on said second film and that extend from said second film toward said first film, wherein a gap between each said filter wall and said first film defines a filter trap, wherein at least two said first flow ports and at least two said second flow ports are associated with each said filter trap;

a first annular seal extending between said first and second films;

a filtering region bounded by said first annular seal, wherein all of said filter walls, said filter traps, said first flow ports, and said second flow ports are located in said filtering region; and

;

a plurality of supports extending between said first and second films.

26. A filter module, as claimed in claim 25, wherein:

said first film and said second film each have a maximum thickness of about 10 microns.

27. A filter module, as claimed in claim 25, wherein:

said first and second films define opposing extremes of said filter module.

28. A filter module, as claimed in claim 25, further comprising:

a first chamber fluidly connected with at least one of said first flow ports; and

a second chamber fluidly connected with at least one of said second flow ports, wherein said filter trap fluidly interconnects said first and second chambers.

29. A filter module, as claimed in claim 25, wherein:

each of said plurality of filter walls are of an annular extent in a plan view of a surface of said second film from which said plurality of filter walls extend, wherein each said filter trap that is thereby also of an annular extent.

30. A filter module, as claimed in claim 29, wherein:

each of said plurality of filter walls may be of any shape in said plan view to define said annular extent of said plurality of filter walls.

31. A filter module, as claimed in claim 25, wherein:

each of said plurality of filter walls terminates prior to reaching a surface of said first film that faces said second film.

32. A filter module, as claimed in claim 25, wherein:

an area defined by projecting each of said plurality of filter walls onto said first film fails to encompass any of said first flow ports.

33. A filter module, as claimed in claim 25, wherein:

a number of said supports is no less than a number of said filter walls.

34. A filter module, as claimed in claim 25, wherein:

a height of each said gap is about 0.3 microns.

35. A filter module, as claimed in claim 25, further comprising:

a second annular seal extending between said first and second films and disposed in spaced relation to said first annular seal, wherein said second annular seal is disposed outwardly of said first annular seal.

36. A filter comprising the filter module of claim 25 in a filter housing.

37. A filter module, comprising:

a first film comprising a plurality of first flow ports that extend through said first film;

a first chamber fluidly connected with at least one of said first flow ports;

a second film comprising a plurality of second flow ports that extend through said second film, wherein said second film is spaced from said first film;

a second chamber fluidly connected with at least one of said second flow ports;

a first filter wall that extends from said second film in a direction of said first film, wherein said first and second chambers are disposed on opposite sides of said first filter wall;

a first filter trap defined in part by said first filter wall, wherein said first filter trap fluidly interconnects said first and second chambers; and

a first annular seal extending between said first and second films.

38. A filter module, as claimed in claim 37, wherein:

said first and second films each have a maximum thickness of about 10 microns.

39. A filter module, as claimed in claim 37, wherein:

said first and second films define opposing extremes of said filter module.

40. A filter module, as claimed in claim 37, wherein:

said first filter wall is of an annular extent in a plan view of a surface of said second film from which first filter wall extends.

41. A filter module, as claimed in claim 40, wherein:

said first filter wall may be of any shape in said plan view to define said annular extent of said first filter wall.

42. A filter module, as claimed in claim 37, wherein:

each of said plurality of filter walls terminates prior to reaching a surface of said first film that faces said second film.

43. A filter module, as claimed in claim 37, wherein:

an area defined by projecting each of said plurality of filter walls onto said first film fails to encompass any of said first flow ports.

44. A filter module, as claimed in claim 37, further comprising:

at least one support associated with said first filter wall that extends between said first and second films.

45. A filter module, as claimed in claim 37, wherein:

a number of said supports is no less than a number of said filter walls.

46. A filter module, as claimed in claim 37, wherein:

at least two said first flow ports and at least two said second flow ports are associated with said first filter trap.

47. A filter module, as claimed in claim 37, wherein:

a height of each said gap is about 0.3 microns.

48. A filter module, as claimed in claim 37, further comprising:

a second annular seal extending between said first and second films and disposed in spaced relation to said first annular seal, wherein said second annular seal is disposed outwardly of said first annular seal.

49. A filter comprising the filter module of claim 39 in a filter housing.