Pumping Cassette

• US 20080253912A1
• Filed: 10/12/2007
• Published: 10/16/2008
• 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 8,888,470 B2
• Time in Patent Office: Days
• US Class Current: 417/477.2
• 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, the cassette includes a housing. The housing includes at least one fluid port and at least one air vent port. The air vent port vents a fluid source outside the housing. The pumping cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pump pumps fluid.

Claims

1. A pumping cassette comprising:

a housing having at least one fluid port and at least one air vent port wherein said air vent post vents a fluid source outside said housing; and

at least one reciprocating pressure displacement membrane pump within said housing wherein said pump pumps a fluid.

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

a top plate;

a midplate; and

a bottom plate.

4. The pumping cassette claimed in claim 1 further comprising at least, one valve.

5. The pumping cassette claimed in claim 4 wherein said valve is a membrane valve.

6. The cassette claimed in claim 5 wherein said at least one valve comprising a valve housing having a membrane, said membrane dividing said housing into two chambers.

7. The cassette claimed in claim 6 wherein one of said two chambers is an actuation chamber and one of said two chambers is a fluid pumping chamber.

8. The cassette claimed in claim 7 wherein said actuation chamber having at least one aperture and said fluid pumping chamber having at least one aperture.

9. The cassette claimed in claim 8 wherein said actuation chamber comprising two apertures.

10. The cassette claimed in claim 9 wherein said valve is a volcano valve.

11. The cassette claimed in claim 10 wherein said fluid pumping chamber comprising a substantially smooth surface.

12. The pumping cassette claimed in claim 2 wherein said valve is a check valve.

13. A pumping cassette comprising:

a housing having at least one source fluid inlet fluid path, at least one source reservoir vent fluid path and at least one source fluid outlet path; and

at least one reciprocating pressure displacement membrane pump within said housing wherein said pump pumps source fluid from a source tank outside said housing and through said source fluid inlet fluid path; and

at least one valve comprising a valve housing having a membrane, said membrane dividing said valve housing into two chambers, a fluid chamber and an actuation chamber.

14. The cassette claimed in claim 13 wherein said at least one reciprocating pressure displacement pump 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.

15. The cassette claimed in claim 13 wherein said cassette housing comprising:

a top plate;

a midplate; and

a bottom plate.

16. The cassette claimed in claim 13 further comprising a valve controlling a measurement system fluidly connected to said source tank vent fluid path.

17. The cassette claimed in claim 16 wherein said measurement system measures the volume of a source tank.

18. The cassette claimed in claim 13 wherein said at least one source reservoir vent fluid path fluidly connected to a vent whereby said source tank is maintained at atmospheric pressure.

19. The cassette claimed in claim 13 wherein said at least one reciprocating pressure displacement membrane pump pumps fluid from said source tank through said housing and through a filter outside said housing.