Automated pre-filtration air management and filtration systems and methods

Patent metadata

Field	Value
Publication number	US-9731060-B2
Application number	US-201414328485-A
Country	US
Kind code	B2
Filing date	Jul 10, 2014
Priority date	Feb 27, 2008
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Filtration systems and methods using a pump and pressure sensor are provided for improved efficiency in fluid filtration systems. A filtration system includes a pre-filter container joined to a post-filter container by a filter line having a filter. To reduce the time required for filtration a pump and pressure sensor are included in a filter inlet flow path. The pump also is used to provide air management in the system via pre-filtration evacuation of air from at least the filter.

First claim

The invention claimed is:

1. A method for (a) preparing a filtration system and (b) filtering a fluid through said system, said system including a filter, a pre-filter container containing fluid to be filtered, a post-filter container, a first pump between said filter and said pre-filter container, an air detector, a first pressure sensor, a second pump and second pressure sensor in communication with the filter and the post-filter container and a flow path between said pre-filter container and said post filter container, said method comprising:
evacuating air from at least a portion of the filter, the post-filter container and said flow path into the pre-filter container by action of said pumps;
operating said pumps in selected flow directions until a desired evacuation of air from said flow path or said post-filter container has been achieved;
and
flowing a fluid from said pre-filter container to said post-filter container by coordinated operation of said first and second pumps.

2. The method of claim 1 , wherein the system further comprises a filter inlet flow path and a filter outlet flow path, said method further comprising permitting air to move from said filter outlet flow path into the filter inlet flow path.

3. The method of claim 1 comprising automatically commencing said flow of the fluid from the pre-filter container and into the post-filter container after the step of flowing air from the filter into the pre-filter container.

4. The method of claim 3 , comprising reversing said first pump to automatically flow the fluid from the pre-filter container, through the first pump and flow path, and into the post-filter container after said flowing air from the filter into the pre-filter container.

5. The method of claim 1 , further comprising monitoring the presence of fluid flowing from the pre-filter container;
detecting a signal from the air detector; and
stopping the pump that is in communication with the pre-filter container and the filter in response to said signal.

6. The method of claim 1 comprising detecting the pressure at said filter and adjusting the speed of one or both of said pumps in response to said detected pressure.

7. The method of claim 2 further comprising detecting the presence of air entering said filter inlet flow path.

8. The method of claim 7 comprising continuing to operate at least one of said pumps after air has been evacuated from said pre-filter container.

9. The method of claim 1 comprising detecting a reduction in the pressure at said filter and adjusting the speed of at least one of said pumps in response to said detection.

10. The method of claim 2 further comprising priming said system after said evacuating.

11. The method of claim 10 wherein said post-filter container contains a solution, said method further comprising priming said system with a solution from said post-filter container.

12. The method of claim 11 comprising detecting the presence of said solution in said flow path.

13. The method of claim 12 further comprising priming said system until the solution is detected in said air detector of said filter inlet flow path.

14. The method of claim 1 comprising detecting pressure at said first and second pressure sensors and adjusting pump speeds of said first and second pumps.

15. A method for (a) preparing a filtration system and (b) filtering a fluid through said system, said system including a filter, a pre-filter container containing fluid to be filtered, a post-filter container, a filter inlet flow path and a filter outlet flow path, a first pump between said pre-filter container and said filter and a second pump between said filter and said post-filter container, and a first pressure sensor on said filter inlet flow path and a second pressure sensor on said filter outlet flow path, and a by-pass line between said post-filter container and said filter inlet flow path, said method comprising:
evacuating air from said post-filter container through said by-pass line;
flowing fluid from said pre-filter container through the flow path by action of said pump;
flowing said evacuated air from said by-pass line into said filter inlet flow path
detecting signals from said first and second pressure sensors; and adjusting said first and second pumps in response to said signals.

16. The method of claim 1 further comprising sending a signal to a microprocessor when air evacuation is completed.

17. The method of claim 15 wherein said by-pass line includes a one way valve.

Assignees

• Fenwal Inc

Inventors

• Gulati Kartike
• Benjamin Grant S

Classifications

• A61M1/3626 Primary

  Gas bubble detectors · CPC title

• A61M1/3643

  Priming, rinsing before or after use · CPC title

• A61M1/10

  Human Necessities · mapped topic

• A61M1/3639

  Blood pressure control, pressure transducers specially adapted therefor · CPC title

• A61M1/3644 Primary

  Mode of operation · CPC title