Pumping Cassette

• US 20090004033A1
• Filed: 10/12/2007
• Published: 01/01/2009
• Est. Priority Date: 02/27/2007
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Grant, Kevin L., Demers, Jason A., Dale, James D., Wilt, Michael J., Tracey, Brian
• Granted Patent: US 8,317,492 B2
• Time in Patent Office: Days
• US Class Current: 417/375
• CPC Class Codes: A61M 1/154 with sensing means or components thereof
• CPC Class Codes: A61M 1/155 with treatment-fluid pumping means or components thereof
• CPC Class Codes: A61M 1/1561 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/15625 the reservoirs acting as balance chambers
• CPC Class Codes: A61M 1/1565 Details of valves
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/1605 Physical characteristics of the dialysate fluid
• CPC Class Codes: A61M 1/1639 linked by membranes
• CPC Class Codes: A61M 1/1656 Apparatus for preparing dialysates
• CPC Class Codes: A61M 1/1664 with temperature control
• CPC Class Codes: A61M 1/1666 by dissolving solids
• CPC Class Codes: A61M 1/287 Dialysates therefor
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 2205/3317 Electromagnetic, inductive or dielectric measuring means
• CPC Class Codes: A61M 2205/3324 PH measuring means
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/268 the displacement member being flexible, e.g. membranes, diaphragms or bladders
• CPC Class Codes: A61M 60/37 Haemodialysis, haemofiltration or diafiltration
• CPC Class Codes: A61M 60/427 : the force acting on the blood contacting member being hydraulic or pneumatic
• CPC Class Codes: A61M 60/43 : using vacuum at the blood pump, e.g. to accelerate filling
• CPC Class Codes: A61M 60/837 : Aspects of flexible displacement members, e.g. shapes or materials
• CPC Class Codes: A61M 60/847 : arranged in a cassette
• CPC Class Codes: A61M 60/849 : Disposable parts
• CPC Class Codes: A61M 60/851 : Valves
• CPC Class Codes: A61M 60/892 : Active valves, i.e. actuated by an external force
• CPC Class Codes: A61M 60/894 : Passive valves, i.e. valves actuated by the blood
• CPC Class Codes: F04B 13/02 : of two or more fluids at the same time
• CPC Class Codes: F04B 23/06 : the pumps being all of reciprocating positive-displacement type
• CPC Class Codes: F04B 41/06 : Combinations of two or more pumps
• CPC Class Codes: F04B 43/00 : Machines, pumps, or pumping installations having flexible working members pumps or pumping installations specially adapted for elastic fluids F04B45/00
• CPC Class Codes: F04B 43/026 : each plate-like pumping flexible member working in its own pumping chamber
• CPC Class Codes: F04B 43/06 : Pumps having fluid drive
• CPC Class Codes: F04B 43/0736 : with two or more pumping chambers in parallel
• CPC Class Codes: F04B 45/02 : having bellows
• CPC Class Codes: F04B 45/0536 : the actuating fluid being controlled by one or more valves
• CPC Class Codes: F04B 49/02 : Stopping, starting, unloading or idling control
• CPC Class Codes: F04B 49/22 : by means of valves F04B49/03 takes precedence
• CPC Class Codes: F04B 53/06 : Venting
• CPC Class Codes: F04B 53/10 : Valves; Arrangement of valves
• CPC Class Codes: F04B 53/16 : Casings; Cylinders; Cylinder liners or heads; Fluid connections
• CPC Class Codes: F04B 7/02 : the valving being fluid-actuated
• CPC Class Codes: F04B 9/109 : having plural pumping chambers
• CPC Class Codes: F17D 3/00 : Arrangements for supervising or controlling working operations
• CPC Class Codes: Y02A 90/10 : Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
• CPC Class Codes: Y10T 137/0324 : With control of flow by a condition or characteristic of a fluid
• CPC Class Codes: Y10T 137/0379 : By fluid pressure
• CPC Class Codes: Y10T 137/2521 : Flow comparison or differential response
• CPC Class Codes: Y10T 137/85978 : With pump
• CPC Class Codes: Y10T 137/86139 : Serial

Abstract

A pumping cassette including a housing having at least two inlet fluid lines and at least two outlet fluid lines. At least one balancing pod within the housing and in fluid connection with the fluid paths. The balancing pod balances the flow of a first fluid and the flow of a second fluid such that the volume of the first fluid equals the volume of the second fluid. The balancing pod also includes a membrane that forms two balancing pods. Also included in the cassette is at least two reciprocating pressure displacement membrane pumps. The pumps are within the housing and they pump the fluid from a fluid inlet to a fluid outlet line and pump the second fluid from a fluid inlet to a fluid outlet.

Claims

1. A pumping cassette comprising:

a housing comprising at least two inlet fluid lines and at least two outlet fluid lines;

at least one balancing pod within said housing and in fluid connection with said fluid paths, whereby said balancing pod balances the flow of a first fluid and the flow of a second fluid such that the volume of said first fluid equals the volume of said second fluid and wherein said balancing pod comprising a membrane wherein said membrane forming two balancing chambers; and

at least one reciprocating pressure displacement membrane pumps within said housing wherein said pressure pump pumps said fluid from a fluid inlet to a fluid outlet line and said second fluid from a fluid inlet to a fluid outlet.

2. The cassette claimed in claim 1 wherein said reciprocating pressure displacement pumps comprising:

a curved rigid chamber wall; and

a flexible membrane attached to said rigid chamber wall, whereby said flexible membrane and said rigid chamber wall define a pumping chamber.

3. The cassette claimed in claim 1 wherein said housing further comprising:

a top plate;

a midplate; and

a bottom plate.

4. The cassette claimed in claim 1 further comprising a metering pump within said housing and fluidly connected to a fluid line, wherein said metering pump pumps a volume of a fluid.

5. The cassette of claim 4 wherein said pressure pump and said metering pump are pneumatically actuated pumps.

6. The cassette claimed in claim 1 further comprising a metering pump within said housing and fluidly connected to a fluid line, wherein said metering pump pumps a volume of a fluid such that said fluid bypasses said balancing chambers and wherein said metering pump is a membrane pump.

7. The cassette of claim 1 further comprising at least one fluid valve.

8. The cassette of claim 7 wherein said cassette comprising at least two fluid valves wherein said at least two fluid valves are actuated by one pneumatic valve.

9. A pumping cassette comprising:

a housing comprising at least one inlet fluid line and at least one outlet fluid line;

at least one balancing pod within said housing and in fluid connection with said fluid paths, whereby said balancing pod balances the flow of a first fluid and the flow of a second fluid such that the volume of said first fluid equals the volume of said second fluid and wherein said balancing pod comprising a membrane wherein said membrane forming two chambers;

at least one reciprocating pressure displacement membrane pump within said housing wherein said pressure pump pumps a fluid from said fluid inlet line to said fluid outlet line; and

a metering pump within said housing and fluidly connected to a fluid line, wherein said metering pump pumps a predetermined volume of a fluid such that said fluid bypasses the balancing chambers and wherein said metering pump is a membrane pump.

10. The cassette claimed in claim 9 wherein said reciprocating pressure displacement pumps comprising:

a curved rigid chamber wall; and

a flexible membrane attached to said rigid chamber wall, whereby said flexible membrane and said rigid chamber wall define a pumping chamber.

11. The cassette claimed in claim 9 wherein said housing further comprising:

a top plate;

a midplate; and

a bottom plate.

12. The cassette of claim 9 further comprising at least one fluid valve.

13. The cassette of claim 12 wherein at least one of said fluid valves is actuated by one pneumatic valve.

14. The cassette of claim 13 wherein said cassette comprising at least two fluid valves wherein said at least two fluid valves are actuated by one pneumatic valve.

15. A pumping cassette comprising:

a housing comprising at least two inlet fluid lines and at least two outlet fluid lines;

at least two balancing pods within said housing and in fluid connection with said fluid lines, whereby said balancing pods balance the flow of pure dialysate and impure dialysate such that the volume of pure dialysate equals the volume of impure dialysate;

at least two reciprocating pressure displacement membrane pumps within said housing wherein said pressure pumps pump said pure dialysate and said impure dialysate; and

a UF metering pump within said housing wherein said UF metering pump pumps a predetermined volume of impure dialysate from said at least one fluid line such that said predetermined volume bypasses said balancing chamber.

16. The cassette claimed in claim 15 wherein said reciprocating pressure displacement pumps comprising:

a curved rigid chamber wall; and

a flexible membrane attached to said rigid chamber wall, whereby said

flexible membrane and said rigid chamber wall define a pumping chamber.

17. The cassette claimed in claim 15 wherein said housing further comprising:

a top plate;

a midplate; and

a bottom plate.

18. The cassette of claim 15 further comprising a plurality of pneumatically actuated fluid valves.