Dual stage ultrafilter devices in the form of portable filter devices, shower devices, and hydration packs

• US 7,534,349 B2
• Filed: 08/31/2006
• Issued: 05/19/2009
• Est. Priority Date: 09/02/2005
• Status: Expired due to Fees

• Current Assignee: Nephros, Inc.
• Original Assignee: Nephros, Inc.
• Inventors: Barta, Norman, Collins, Gregory R., Summerton, James
• Primary Examiner(s): Menon; Krishnan S
• Application Number:
  US11/469,261
• Publication Number:
  US 20070163943A1
• Time in Patent Office: 992 Days
• Field of Search: None
• US Class Current: 210/258
• CPC Class Codes: A45F 2003/166 Hydration systems attached to the body by straps, e.g. incorporated in a backpack
• CPC Class Codes: A45F 3/20 of flexible material; Collapsible or stackable cups
• CPC Class Codes: B01D 2313/06 External membrane module supporting or fixing means
• CPC Class Codes: B01D 2313/086 Meandering flow path over the membrane
• CPC Class Codes: B01D 2313/10 Specific supply elements
• CPC Class Codes: B01D 2313/105 Supply manifolds
• CPC Class Codes: B01D 2313/125 Discharge manifolds
• CPC Class Codes: B01D 2313/20 Specific housing
• CPC Class Codes: B01D 2313/201 Closed housing, vessels or containers
• CPC Class Codes: B01D 2313/24 Specific pressurizing or depressurizing means
• CPC Class Codes: B01D 2313/243 Pumps
• CPC Class Codes: B01D 2313/90 Additional auxiliary systems integrated with the module or apparatus
• CPC Class Codes: B01D 2313/903 Integrated control or detection device
• CPC Class Codes: B01D 2319/025 Permeate series
• CPC Class Codes: B01D 61/145 Ultrafiltration
• CPC Class Codes: B01D 61/18 Apparatus therefor
• CPC Class Codes: B01D 61/20 Accessories; Auxiliary operations
• CPC Class Codes: B01D 63/02 Hollow fibre modules
• CPC Class Codes: B01D 63/021 Manufacturing thereof
• CPC Class Codes: B01D 63/04 comprising multiple hollow fibre assemblies
• CPC Class Codes: B01D 65/022 : Membrane sterilisation
• CPC Class Codes: C02F 1/002 : using small portable filters for producing potable water, e.g. personal travel or emergency equipment, survival kits, combat gear C02F1/003 takes precedence
• CPC Class Codes: C02F 1/444 : by ultrafiltration or microfiltration

Abstract

The present invention is directed to an alternative compact portable filtration device that can be used in remote locations and includes a single filtration cartridge that provides redundant filtration of the fluid (water). In particular, the device is a dual stage ultrafilter cartridge (apparatus) that is constructed and designed to provide a portable device that can be used in the field, such as during camping or military assignment, and offers two filtration stages (redundant filtration) within a single housing.

Claims

1. A hand held dual-stage filtration cartridge comprising:

a cartridge including a housing having a first sterilization stage including first semi-permeable filtering elements and a second sterilization stage including second semi-permeable filtering elements, the housing having a first end and a second end with the first end including a fluid inlet port and a fluid outlet port and a member that divides the housing into the first sterilization stage and the second sterilization stage, the fluid inlet port being in fluid communication only with the first sterilization stage, while the fluid outlet port is in fluid communication only with the second sterilization stage, wherein the first and second semi-permeable filtering elements are sealed at the second end of the housing so as to cause the fluid entering the fluid inlet port to flow within lumen sections of the first semi-permeable filtering elements and then be filtered by being conducted across the first semi-permeable filtering elements and then subsequently being filtered again by being conducted across the second semi-permeable filtering elements and into the lumen sections of the second semi-permeable filtering elements prior to being discharged through the fluid outlet port; and

a pump mechanism for pumping fluid into first sterilization stage and through both the first and second stages so that twice filtered fluid is discharged through the fluid outlet port,

wherein the pump mechanism comprises a piston pump that is operable to draw fluid from a source into a holding chamber associated with the piston pump before being discharged into the first sterilization stage, and

wherein the pump mechanism is incorporated in the housing.

2. The dual-stage filtration cartridge of claim 1, wherein a first end of the housing includes an inner header space between a header end wall and first ends of the first and second semi-permeable filtering elements, the inner header space including an inner wall that divides the inner header space into a first inner header space and a second inner header space, the fluid inlet port being in fluid communication only with the first inner header space while the fluid outlet port is in fluid communication only with the second inner header space.

3. The dual-stage filtration cartridge of claim 2, wherein the first and second inner header spaces are concentric with respect to one another.

4. The dual-stage filtration cartridge of claim 2, further including:

a first potting compound disposed at the first ends of the first and second semi-permeable filtering elements, the first potting compound permitting fluid communication between the first inner header space and the first semi-permeable filtering elements as well as between the second inner header space and the second semi-permeable filtering elements; and

a second potting compound at the second ends of the first and second semi-permeable filtering elements for sealing off the second ends thereof.

5. The dual-stage filtration cartridge of claim 1, wherein the fluid enters the first stage and is discharged from the second stage at the same end of the housing.

6. The dual-stage filtration cartridge of claim 1, wherein the fluid is delivered through a first conduit from the source to the holding chamber and is discharged through a second conduit from the chamber to a first inner header space that is in fluid communication with only the first sterilization stage, the first conduit having a first one way valve associated therewith, while the second conduit has a second one way valve associated therewith such that when the fluid is being drawn into the holding chamber, the first valve is open and the second valve is closed and when the fluid is being discharged from the holding chamber to the first inner header spacer, the second valve is open and the first valve is closed.

7. The dual-stage filtration cartridge of claim 6, further including:

a winder mechanism for winding and unwinding the first conduit into a dry storage compartment that is separate from an inner header space that has a first section where the fluid is received and flows into the first sterilization stage and a second section where the fluid is discharged from the second sterilization stage.

8. The dual-stage filtration cartridge of claim 1, wherein the pump mechanism is a hand operable bellows type pump mechanism that is disposed at the second end of the housing and expands and contracts in a longitudinal direction along the length of the housing to an open position and a closed position, respectively, wherein the bellows type pump mechanism includes a cap and a bellows member having one end attached to the second end of the housing and a second end attached to the cap such that the cap can rotate relative to the bellows member, the bellows member having a fluid holding chamber formed therein.

9. The dual-stage filtration cartridge of claim 8, wherein the fluid is delivered through a first conduit from the source to the holding chamber and is discharged through a second conduit from the chamber to a first inner header space that is in fluid communication with only the first sterilization stage, the first conduit having a first one way valve associated therewith, while the second conduit has a second one way valve associated therewith such that when the fluid is being drawn into the holding chamber, the first valve is open and the second valve is closed and when the fluid is being discharged from the holding chamber to the first inner header spacer, the second valve is open and the first valve is closed.

10. A wearable, mobile hydration unit with dual-stage sterilization comprising:

a flexible structure constructed to be worn by a person and including;

a first bladder for storing unsterilized, raw water;

a cartridge including a housing having a first sterilization stage including first semi-permeable filtering elements and a second sterilization stage including second semi-permeable filtering elements, the housing having a first end and a second end with the first end including a fluid inlet port that receives the raw water from the first bladder and a fluid outlet port and a member that divides the housing into the first sterilization stage and the second sterilization stage, the fluid inlet port being in fluid communication only with the first sterilization stage, while the fluid outlet port is in fluid communication only with the second sterilization stage,

wherein the first and second semi-permeable filtering elements are sealed at the second end of the housing so as to cause the fluid entering the fluid inlet port to flow within lumen sections of the first semi-permeable filtering elements and then be filtered by being conducted across the first semi-permeable filtering elements and then subsequently being filtered again by being conducted across the second semi-permeable filtering elements and into the lumen sections of the second semi-permeable filtering elements prior to being discharged through the fluid outlet port as purified water;

a hand operable pump mechanism for drawing the raw water from the first bladder and delivering it through the fluid inlet port into the first sterilization stage; and

a second bladder fluidly connected to the fluid outlet port of the cartridge for receiving and storing the purified water.

11. The apparatus of claim 10, wherein the flexible structure comprises a back pack to be worn on the person'"'"'s back and that contains the first bladder, the pump mechanism, the cartridge and the second bladder, with at least a portion of the pump mechanism being accessible by the person to permit operation of the pump mechanism.

12. The apparatus of claim 10, wherein the hand operable pump mechanism is one of a piston pump mechanism and a diaphragm pump mechanism.

13. The apparatus of claim 10, wherein each of the first and second bladders are expandable/compressible bladders.

14. The apparatus of claim 13, wherein the first and second bladders are formed as a single, integral structure.

15. The apparatus of claim 10, wherein the first and second bladders are arranged adjacent one another and occupy a given space such that as untreated water is discharged from the first bladder and delivered to the second bladder, the volumes of the individual bladders change however the volume of the given space remains substantially the same.

16. The apparatus of claim 10, wherein the pump mechanism and the cartridge are formed as a single, integral cartridge.