MEMS flow module with pivoting-type baffle

• US 20060173399A1
• Filed: 02/01/2005
• Published: 08/03/2006
• Est. Priority Date: 02/01/2005
• Status: Abandoned Application

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: Becton, Dickinson & Co
• Inventors: Sniegowski, Jeffry J., Rodgers, M. Steven, McWhorter, Paul J., Barnes, Stephen M., Smith, Norman F.
• Application Number:
  US11/048,195
• Publication Number:
  US 20060173399A1
• Time in Patent Office: Days
• US Class Current: 604/9
• CPC Class Codes: A61F 9/00781 Apparatus for modifying intraocular pressure, e.g. for glaucoma treatment drainage implants in general A61M27/002
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites

Abstract

Various embodiments of MEMS flow modules that regulate flow or pressure by the pivoting or pivoting-like movement of a flow regulating or controlling structure are disclosed. One such MEMS flow module (40) has a flow regulating structure (62) including a plurality of baffles (66) and a flow plate (50) including a plurality of flow ports (52). The flow regulating structure (62) also has a support (64) that is spaced from and anchored to the flow plate (50). Each baffle (66) is aligned with at least one flow port (52) and is interconnected to the support (64) of the flow regulating structure (62) in a manner that allows the baffles (66) to flex away from the flow plate (50) based upon the development of at least a certain differential pressure across the MEMS flow module (40).

Claims

1. A MEMS flow module, comprising:

a first plate comprising a first flow port;

a structure comprising a first portion disposed in a fixed positional relationship relative to said first plate and a second portion that at least partially extends over said first flow port, wherein said second portion flexes relative to said first portion in response to the development of at least a certain differential pressure.

2. A MEMS flow module, as claimed in claim 1, further comprising:

at least one anchor extending between said first portion of said structure and said first plate to fixedly interconnect said first portion of said structure with said first plate.

3. A MEMS flow module, as claimed in claim 1, wherein said structure comprises an elongate structure.

4. A MEMS flow module, as claimed in claim 3, wherein said elongate structure further comprises:

a first free end, wherein said second portion is disposed between said first portion and said first free end.

5. A MEMS flow module, as claimed in claim 4, wherein said first free end moves along an at least generally arcuate path in response to the development of at least a certain differential pressure across said second portion of said structure.

6. A MEMS flow module, as claimed in claim 4, wherein said elongate structure further comprises at least one of a cross-sectional shape and a length designed to provide a predetermined resistance to flexure.

7. A MEMS flow module, as claimed in claim 1, wherein said structure and said first plate are formed from adjacent structural MEMS layers.

8. A MEMS flow module, as claimed in claim 1, wherein said second portion of said structure is sized to overly said first flow port when said second portion of said structure is disposed at least generally adjacent to said first flow port.

9. A MEMS flow module, as claimed in claim 8, wherein said second portion of said structure at least substantially blocks a flow through said first flow port in one direction.

10. A MEMS flow module, as claimed in claim 1, wherein said second portion of said structure is substantially parallel to said first plate until the development of at least a certain differential pressure across said second portion.

11. A MEMS flow module, as claimed in claim 1, wherein said second portion of said structure is always disposed in a spaced relationship with said first plate.

12. A MEMS flow module, as claimed in claim 1, wherein a flow-controlling gap of no more than about 0.3 microns exists between said second portion of said structure and said first flow port, until the development of at least a certain differential pressure across said second portion.

13. A MEMS flow module, as claimed in claim 1, wherein the development of at least a certain differential pressure across said second portion of said structure flexes said second portion of said structure away from said first flow port to increase a spacing between said second portion of said structure and said first flow port, and thereby increases a volume of a flow path through said MEMS flow module.

14. A MEMS flow module, as claimed in claim 13, wherein said volume of said flow path increases greater than proportionally for a corresponding increase in a differential pressure across said MEMS flow module.

15. A MEMS flow module, as claimed in claim 1, wherein said first plate comprises a plurality of said first flow ports.

16. A MEMS flow module, as claimed in claim 15, wherein said structure comprises a plurality of said second portions that each at least partially extend over at least one of said plurality of said first flow ports.

17. A MEMS flow module, as claimed in claim 15, further comprising:

a corresponding plurality of said structures, wherein said second portion of each said structure at least partially extends over one of said plurality of said first flow ports, wherein said first portion of each of said plurality of structures are located at substantially at a common first distance from a common point, and wherein said second portion of each of said plurality of structures are located at substantially said first distance from said common point.

18. A MEMS flow module, as claimed in claim 1, further comprising:

a second plate comprising a second flow port, wherein said first and second plates are fixedly interconnected in a spaced and face-to-face relationship.

19. A MEMS flow module, as claimed in claim 18, wherein said first flow port and said second flow port are at least partially aligned.

20. A MEMS flow module, as claimed in claim 1, wherein:

said MEMS flow module is a passive device.

21. A MEMS flow module, as claimed in claim 1, wherein said second portion of said structure further comprises:

a plug structure for disposition within at least a portion of said first flow port.

22. A MEMS flow module, as claimed in claim 1, further comprising:

a flow-restricting structure associated with said first flow port, wherein said flow-restricting structure is disposed somewhere between said first plate and said second portion of said structure.

23. An implant for addressing pressure within a first body region, comprising said MEMS flow module of claim 1 and a conduit, wherein said conduit comprises a flow path that is adapted to fluidly interconnect with the first body region, and wherein said MEMS flow module is disposed in said flow path.

24. A MEMS flow module, comprising:

a first plate comprising a first flow port;

a cantilever structure comprising a first portion that is disposed in a fixed positional relationship relative to said first plate, as well as a free end that is operative to move along an at least generally arcuate path in response to the development of at least a certain differential pressure across said cantilever structure.

25. A MEMS flow module, as claimed in claim 24, wherein a beam portion of said cantilever structure is disposed between said first portion and said first free end.

26. A MEMS flow module, as claimed in claim 24, wherein said beam portion of said cantilever structure is disposed at least generally adjacent to said first flow port until the development of at least a certain differential pressure across said cantilever structure.

27. A MEMS flow module, as claimed in claim 24, wherein a flow rate out of said MEMS flow module increases greater than proportionally for a corresponding increase in a differential pressure across said MEMS flow module.

28. A MEMS flow module, as claimed in claim 24, further comprising;

a plurality of said first flow ports through said first plate.

29. A MEMS flow module, as claimed in claim 28, wherein said cantilever structure comprises a plurality of said free ends, wherein each said free end is associated with at least one said first flow port.

30. A MEMS flow module, as claimed in claim 29, wherein each said free end corresponds with a separate beam portion extending between said fixed portion and each said free end, wherein each said separate beam portion is disposed relative to at least one of said plurality of said first flow ports.

31. A MEMS flow module, as claimed in claim 28, further comprising:

a plurality of said cantilever structures, wherein each said free end is operative to move along an at least generally arcuate path in response to the development of at least a certain differential pressure across said cantilever structure.

32. A MEMS flow module, as claimed in claim 24, wherein said cantilever structure permits a flow through said MEMS flow module in a first direction and substantially restricts a flow through said MEMS flow module in a second direction that is opposite said first direction.

33. A MEMS flow module, as claimed in claim 24, further comprising:

a second plate comprising a second flow port, wherein said first and second plates are fixedly interconnected in a spaced and face-to-face relationship.

34. A MEMS flow module, as claimed in claim 33, wherein said first flow port in said first plate and said second flow port in said second plate are at least partially aligned.

35. An implant for addressing pressure within a first body region, comprising said MEMS flow module of claim 24 and a conduit, wherein said conduit comprises a flow path that is adapted to fluidly interconnect with the first body region, and wherein said MEMS flow module is disposed in said flow path.

36. A MEMS flow module, comprising:

a flow regulator that comprises a plurality of independently movable baffles; and

a first plate that comprises a plurality of first flow ports, wherein each said baffle is aligned with at least one said first flow port, wherein each said baffle is at least generally pivotable to change a magnitude of a spacing of said baffle from said first plate in response to a change in differential pressure across said MEMS flow module.

37. A MEMS flow module, as claimed in claim 36, wherein said flow regulator comprises a support that is spaced from said first plate, wherein said a plurality of baffles are interconnected with said support, and wherein said first plate is structurally interconnected with said support.

38. A MEMS flow module, as claimed in claim 37, wherein said support comprises a perimeter, wherein an entirety of a region disposed inwardly of said perimeter is occupied by said support.

39. A MEMS flow module, as claimed in claim 37, wherein said support comprises an aperture and an annular section disposed about said aperture, wherein said plurality of baffles are interconnected with said annular section.

40. A MEMS flow module, as claimed in claim 37, wherein each of said plurality of baffles extends directly from said support, and wherein each of said plurality of baffles flexes to move relative to said first plate.

41. A MEMS flow module, as claimed in claim 36, wherein each of said plurality of baffles extend outwardly along a separate radii emanating from a common point.

42. A MEMS flow module, as claimed in claim 36, further comprising a flow restricting structure associated with each said first flow port, wherein each said flow-restricting structure is disposed about its corresponding said first flow port, wherein each said flow-restricting structure extends from one of said first plate and a corresponding said baffle and terminates prior to reaching the other of said first plate and said corresponding said baffle when said plurality of baffles are parallel with said first plate.

43. A MEMS flow module, as claimed in claim 36, wherein each said baffle comprises a plug that extends into, but is spaced from, its corresponding said first flow port.

44. A MEMS flow module, as claimed in claim 36, further comprising an annular support disposed about and spaced from said flow regulator, wherein said MEMS flow module further comprises at least one annular wall that interconnects said annular support and said first plate, and wherein said annular support and said plurality of baffles exist in a common fabrication level.

45. A MEMS flow module, as claimed in claim 36, wherein said plurality of baffles exist at least in a first fabrication level and said first plate exists at least in a second fabrication level that is spaced from said first fabrication level.

46. A MEMS flow module, as claimed in claim 36, further comprising a second plate that comprises a plurality of second flow ports and that is spaced from said first plate such said first plate is located between said plurality of baffles and said second plate, and wherein said MEMS flow module further comprises at least one structural interconnection extending between said first and second plates.

47. A MEMS flow module, as claimed in claim 46, wherein said plurality of baffles exist at least in a first fabrication level, wherein said first plate exists at least in a second fabrication level that is spaced from said first fabrication level, and wherein said second plate exists at least in a third fabrication level that is spaced from said second fabrication level such that said second fabrication level is located between said first and third fabrication levels.

48. A MEMS flow module, as claimed in claim 46, wherein said first plate comprises a plurality of first etch release holes, wherein said second plate comprises a plurality of second etch release holes, and wherein each of said plurality of baffles comprises a third etch release hole that is aligned with its corresponding said first flow port.

49. A MEMS flow module, as claimed in claim 48, further comprising a first flow restrictor for at least one said first etch release hole, a second flow restrictor for at least one said second etch release hole, and a third flow restrictor for at least one said third etch release hole.

50. A MEMS flow module, as claimed in claim 36, wherein said plurality of baffles are symmetrically disposed about a common point such that a length dimension of each said baffle is oriented so as to be other than along a radii extending from said common point, wherein corresponding portions of said plurality of baffles are equidistant from said common point.

51. A MEMS flow module, as claimed in claim 50, wherein each said baffle comprises a first point that is aligned with a center of its corresponding said first flow port, wherein each said baffle further comprises a second point that corresponds with a center of a region where said baffle is anchored, and wherein said first and second points are disposed at least generally the same distance from said common point.

52. A MEMS flow module, as claimed in claim 50, wherein each said baffle is individually anchored to said first plate.

53. A MEMS flow module, as claimed in claim 36, wherein said plurality of baffles are symmetrically disposed about a common point, wherein each baffle has a length dimension that extends along a first axis that fails to intersect with said common point, wherein said first axes of said plurality of baffles intersect so as to define an area, and wherein said common point is disposed within said area.

54. A MEMS flow module, as claimed in claim 36, wherein said first plate comprises a plurality of first etch release holes that extend through said first plate, wherein each of said plurality of baffles comprises at least one second etch release hole, and wherein each said second etch release hole extends through its corresponding said baffle.

55. A MEMS flow module, as claimed in claim 54, further comprising:

a first flow restrictor for at least one said first etch release hole and a second flow restrictor for at least one said second etch release hole for each said baffle.

56. An implant for addressing pressure within a first body region, comprising said MEMS flow module of claim 36 and a conduit, wherein said conduit comprises a flow path that is adapted to fluidly interconnect with the first body region, and wherein said MEMS flow module is disposed in said flow path.