VARIABLE FLOW RESHAPABLE FLOW RESTRICTOR APPARATUS AND RELATED METHODS

• US 20080092969A1
• Filed: 08/07/2006
• Published: 04/24/2008
• Est. Priority Date: 08/07/2006
• Status: Abandoned Application

• Current Assignee: Tandem Diabetes Care Incorporated
• Original Assignee: Tandem Diabetes Care Incorporated
• Inventors: DiPerna, Paul Mario
• Application Number:
  US11/462,962
• Publication Number:
  US 20080092969A1
• Time in Patent Office: Days
• US Class Current: 138/46
• CPC Class Codes: F15D 1/00 Influencing flow of fluids
• CPC Class Codes: F15D 1/02 in pipes or conduits
• CPC Class Codes: G05D 7/01 without auxiliary power
• CPC Class Codes: Y10T 137/0391 Affecting flow by the addition of material or energy
• CPC Class Codes: Y10T 137/7759 Responsive to change in rate of fluid flow

Abstract

A novel apparatus and associated methods for controlling the flow through a flow restrictor using a reshapable lumen. The lumen reshapes as a function of the pressure differential over the flow restrictor. Because flow rate is proportional by the fourth order of magnitude to the diameter of the lumen, small changes in the pressure differential allow for large changes in the flow rate over conventional flow restrictor systems and provides for real time, fine-tuned adjustments to the flow rate.

Claims

1. A flow restrictor comprising:

at least one reshapable lumen;

wherein each lumen reshapes as a function of pressure within the lumen.

2. The method of claim 1, wherein the flow restrictor is made from a compliant biocompatible material.

3. The method of claim 2, wherein the compliant biocompatible material is one of the group consisting of silicon rubber, natural rubber, polyisoprene, and urethane.

4. The method of claim 1, wherein a plasticizer is added to an unmodified flow restrictor made from a compliant biocompatible material to produce the flow restrictor;

wherein each flow restrictor is a biocompatible material.

5. The method of claim 1, wherein the flow restrictor is used in the drilling and transport of petroleum products.

6. The flow restrictor of claim 1, wherein the lumen is a non-circular shape.

7. The flow restrictor of claim 1, further comprising feedback mechanism, wherein the feedback mechanism measures at least a flow rate of a flow material.

8. The flow restrictor of claim 7, wherein the feedback mechanism provides at least flow rate data in real time.

9. The flow restrictor of claim 1, wherein the reshapable lumen further comprises a mechanical lumen reshaper.

10. The flow restrictor of claim 9, wherein the mechanical lumen reshaper comprises at least one plate, the plate being connected to at least one spring mounted to a substrate fixed relative to the flow restrictor;

wherein as pressure in the lumen increases, the plate exerts additional pressure on the at least one spring to which it is connected, compressing the spring and effecting an increased cross-sectional area of the lumen.

11. The flow restrictor of claim 9, wherein the mechanical lumen reshaper further comprises a spring actuated lumen resizer and an ancillary flow channel;

wherein the ancillary flow channel applies pressure to the resizer in about an opposite orientation to the at least one spring.

12. The flow restrictor of claim 11, wherein the lumen resizer exerts pressure on the flow restrictor effecting a decreased cross-sectional area proportional to a drop in the pressure in the lumen.

13. The flow restrictor of claim 1, wherein the at least one reshapable lumen comprises at least one lumen extension.

15. The flow restrictor of claim 1, wherein the flow restrictor is made from a non-biocompatible material.

14. The flow restrictor of claim 14, wherein the at least one lumen extension is at least one rugae.

16. A method of varying the flow rate through a flow restrictor comprising the steps of:

providing a flow restrictor having at least one reshapable lumen, wherein the lumen reshapes as a function of the pressure within the lumen;

allowing for the pressure of a flow material to vary within each lumen, the variance in pressure causing each lumen to reshape resulting in increased or decreased flow rate of the flow material.

17. The method of claim 16, wherein the flow restrictor is made from a compliant biocompatible material.

18. The method of claim 17, wherein the flow restrictor is made from a non-biocompatible material.

19. The method of claim 16, wherein a plasticizer is added to an unmodified flow restrictor made from a compliant biocompatible material to produce the flow restrictor;

wherein each flow restrictor is a biocompatible material.

20. The method of claim 16, wherein the flow restrictor is used in the drilling and transport of petroleum products.

21. The method of claim 16, further comprising providing a feedback mechanism to monitor a flow rate in real time.

22. The method of claim 21, wherein adjustments to the flow rate are calculated by using data derived from the feedback mechanism.

23. The method of claim 16, wherein change of the flow rate is proportional to about the fourth power of the change in a diameter of a cross-sectional area of each lumen.

24. The method of claim 23, wherein the diameter is about an average of the sum of the diameters of a flow restrictor lumen.

25. The method of claim 16, wherein the resultant reshape of each lumen comprises a larger cross-sectional area.

26. The method of claim 16, further comprising providing at least one lumen extension.

27. A method of varying flow rate through a flow restrictor comprising the step of providing a flow restrictor having a reshapable lumen, wherein the flow rate varies as a combination of the diameter of the lumen and the pressure within the lumen.

28. A method of varying a flow rate of a flow material through a flow restrictor by providing a reshapable lumen, wherein the flow rate of the flow material varies as a) a function of pressure within the reshapable lumen and b) a function of the diameter of the reshapable lumen.

29. The method of claim 28, wherein lumen reshapes as a function of the pressure of a flow material.

30. The method of claim 28, wherein flow rate is monitored by a feedback mechanism, wherein the feedback mechanism measures at least the flow rate of the flow material.

31. The method of claim 28, wherein flow rate of the flow material further varies c) due to at least one lumen extension, the lumen extension increasing surface area upon which a boundary layer forms.