Flow regulator damper element

• US 5,163,920 A
• Filed: 01/30/1991
• Issued: 11/17/1992
• Est. Priority Date: 01/30/1991
• Status: Expired due to Fees

• Current Assignee: Arrow Interventional, Inc. (Teleflex Incorporated)
• Original Assignee: InfusAID, Inc. (Pfizer Inc.)
• Inventors: Olive, Peter
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): MCDERMOTT, CORRINE MARIE
• Application Number:
  US07/650,371
• Time in Patent Office: 657 Days
• Field of Search: 604/30, 604/31, 604/133, 604/141, 604/186, 604/246, 604/247, 604/254, 128/DIG. 12, 137/499, 137/504
• US Class Current: 604/247
• CPC Class Codes: A61M 2205/0244 Micromachined materials, e.g. made from silicon wafers, microelectromechanical systems [MEMS] or comprising nanotechnology
• CPC Class Codes: A61M 2205/0294 Piezoelectric materials
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: A61M 5/16881 Regulating valves on-off valves, e.g. clamps A61M39/28
• CPC Class Codes: F15C 5/00 Manufacture of fluid circuit elements; Manufacture of assemblages of such elements integrated circuits
• CPC Class Codes: F16K 2099/0074 using photolithography, e.g. etching
• CPC Class Codes: F16K 2099/0088 Implanted devices
• CPC Class Codes: F16K 99/0001 Microvalves microdevices B81B1/00; manufacture or treatment of devices or systems in or on a substrate B81C1/00; microfluidic structures B01L3/5027; micropumps F04B19/006
• CPC Class Codes: F16K 99/0007 of cantilever type
• CPC Class Codes: F16K 99/0015 Diaphragm or membrane valves
• CPC Class Codes: F16K 99/0057 the fluid being the circulating fluid itself, e.g. check valves
• CPC Class Codes: G05D 7/0113 the sensing element acting as a valve
• CPC Class Codes: Y10S 128/12 Pressure infusion
• CPC Class Codes: Y10T 137/7792 Movable deflector or choke

Abstract

A flow regulator/restrictor placed in a fluid path to passively compensate for variations in fluid pressure by deflection or movement. In one embodiment a silicon micromachined housing has a damper beam cantilevered to the interior wall between inlet and outlet. Deflections of the beam vary the volume of the restrictive gap formed between the damper beam and the interanl wall of the housing adjacent the outlet. In another embodiment the damper element is a floating element in the housing and has conformal side walls with the interior of the housing. The restrictor elements may be stacked to provide a stepped pressure drop, restrictor system.

Claims

1. A device placed in a fluid flow to equalize pressure between an inlet and an outlet comprising:

a housing, said housing having a fluid inlet, a fluid outlet and a chamber therebetween;

a unitary silicon damper beam in said chamber, said damper beam affixed to said housing and dividing said chamber into two regions, one of said regions defining a restrictive gap between said damper beam and said fluid outlet,

wherein variations in pressure between said fluid inlet and said fluid outlet are compensated by deflection of said damper beam to vary the volume of said restrictive gap and thereby provide a compensated flow at said outlet.

2. The device of claim 1 wherein said damper beam comprises a cantilevered beam attached at one end to said housing and having at the opposite end a plate member positioned between said fluid inlet and said fluid outlet.

3. The device of claim 2 wherein said fluid inlet and said fluid outlet are positioned on said housing in alignment with each other and wherein said plate is symmetrical to said alignment of said fluid inlet and fluid outlet.

4. The device of claim 1 further comprising electronic means positioned on said damper beam to provide an output representative of beam deflection.

5. The device of claim 1 wherein said housing comprising a housing body and a cover member, said housing body and said damper beam comprising an integral silicon structure.

6. The device or claim 5 further comprising electronic means on said housing to determine in-vivo temperature of said device.

7. The device of claim 1 further comprising a second housing, said second housing having a fluid inlet positioned in fluid communication with said fluid outlet of said housing;

said second housing having a fluid outlet and a chamber between said fluid inlet and said fluid outlet of said second chamber,

a damper beam positioned in the said second housing'"'"'s chamber and dividing it into two regions, one region defining a restrictive gap in said second housing between said damper beam therein and the fluid outlet of said second housing, wherein variations in pressure in said fluid flow between said inlet in said housing and said fluid outlet of said second housing are compensated by deflections of the respective damper beams.

8. A device placed in a fluid flow to equalize pressure between an inlet and an outlet comprising:

a first housing, said first housing having a fluid inlet, a fluid outlet and a chamber therebetween;

a unit damper beam in said chamber, said damper beam affixed to said housing and dividing said chamber into two regions, one of said regions defining a restrictive gap between said damper beam and said fluid outlet,

wherein variations in pressure between said fluid inlet and said fluid outlet are compensated by deflection of said damper beam to vary the volume of said restrictive gap and thereby provide a compensated flow at said outlet;

a second housing, said second housing having a fluid inlet positioned in fluid communication with said fluid outlet of said first housing;

said second housing having a fluid outlet and a chamber between said fluid inlet and said fluid outlet of said second housing,

a damper beam positioned in the said second housing'"'"'s chamber and dividing it into two regions, one region defining a restrictive gap in said second housing between said damper beam therein and the fluid outlet of said second housing, wherein variations in pressure in said fluid flow between said inlet in said housing and said fluid outlet of said second housing are compensated by deflections of the respective damper beams.

9. The device of claim 8 wherein said damper beam in said housing has a different geometry than the damper beam in said second housing.

10. The device of claim 8 wherein said chamber of said housing has a volume which is different than the volume of the chamber in said second housing.

11. An implantable medication device comprising;

a reservoir having a supply of medication, means to urge said medication out of said reservoir;

a capillary in fluid communication with said reservoir receiving said medication and delivering it to a treatment site;

a flow regulator placed between said reservoir and said capillary to passively equalize fluid pressure of medication to said capillary, said flow regulator comprising;

a housing, said housing comprising a housing body and a cover member and having an inlet in fluid communication with said reservoir, a fluid outlet in communication with said capillary and a chamber between said fluid inlet and said fluid outlet;

a damper element in said chamber, said damper element dividing said chamber into two regions, one of which defining a restrictive gap between said damper beam and said fluid outlet, said housing body and said damper element comprising an integral silicon structure wherein variations in pressure between said fluid inlet and said fluid outlet are compensated by movement of said damper element to vary the volume of said restrictive gap and thereby provide a compensated flow to said outlet.

12. The device of claim 11 wherein said damper element comprises a cantilevered beam attached to said housing at one end and having at the opposite end a plate member positioned between said fluid inlet and said fluid outlet.

13. The device of claim 12 wherein said fluid inlet and said fluid outlet are positioned on said housing in alignment with each other and wherein said plate is symmetrical to said alignment of said fluid inlet and fluid outlet.

14. The device of claim 14 further comprising electronic means on said housing to determine in-vivo temperature of said device.

15. An implantable medication device comprising;

a reservoir having a supply of medication, means to urge said medication out of said reservoir;

a capillary in fluid communication with said reservoir receiving said medication and delivering it to a treatment site;

a flow regulator placed between said reservoir and said capillary to passively equalize fluid pressure of medication to said capillary, said flow regulator comprising;

a housing, said housing having an inlet in fluid communication with said reservoir, a fluid outlet in communication with said capillary and a chamber between said fluid inlet and said fluid outlet;

a damper element in said chamber, said damper element dividing said chamber into two regions and comprising, a unitary silicon member placed in said chamber and not mounted to an internal wall.

16. The device of claim 15 further comprising electronic means positioned on said damper element to provide an output representative of element deflection.

17. An implantable medication device comprising;

a reservoir having a supply of medication, means to urge said medication out of said reservoir;

a capillary in fluid communication with said reservoir receiving said medication and delivering it to a treatment site;

a flow regulator placed between said reservoir and said capillary to passively equalize fluid pressure of medication to said capillary, said flow regulator comprising;

a housing, said housing having an inlet in fluid communication with said reservoir, a fluid outlet in communication with said capillary and a chamber between said fluid inlet and said fluid outlet;

a damper element in said chamber, said damper element dividing said chamber into two regions, one of which defining a restrictive gap between said damper beam and said fluid outlet, wherein variations in pressure between said fluid inlet and said fluid outlet are compensated by movement of said damper element to vary the volume of said restrictive gap and thereby provide a compensated flow to said outlet,

a second housing, said second housing having a fluid inlet positioned in fluid communication with said fluid outlet of said housing;

said second housing having a fluid outlet and a chamber between said fluid inlet and said fluid outlet of said second housing,

a damper beam positioned in the said second housing'"'"'s chamber and dividing it into two regions, one region defining a restrictive gap in said second housing between said damper beam therein and the fluid outlet of said second housing, wherein variations in pressure in said fluid flow between said inlet in said housing and said fluid outlet of said second housing are compensated by deflections of the respective damper beams.

18. The device of claim 17 wherein said damper element in said housing has a different geometry than the damper beam in said second housing.

19. The device of claim 17 wherein said chamber of said housing has a volume which is different than the volume of the chamber in said second housing.