PUMPING CASSETTE

• US 20130074959A1
• Filed: 09/21/2012
• Published: 03/28/2013
• Est. Priority Date: 02/27/2007
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Demers, Jason A., Wilt, Michael J., Grant, Kevin L., Dale, James D., Tracey, Brian D.
• Granted Patent: US 9,272,082 B2
• Time in Patent Office: Days
• US Class Current: 137/565.01
• 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 pump cassette is disclosed. The pump cassette includes a housing having at least, one fluid inlet line and at least one fluid outlet line. The cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pressure pump pumps a fluid from the fluid inlet line to the fluid outlet line. A hollow spike is also included on the housing as well as at least one metering pump The metering pump is fluidly connected to the hollow spike on the housing and to a metering pump fluid line. The metering pump fluid line is fluidly connected to the fluid outlet line.

Claims

1. A pump cassette comprising:

a housing having a top plate forming a first face of the housing, a bottom plate forming an opposing second face of the housing, and a midplate positioned between the top plate and the bottom plate,

the housing comprising;

a main flow path fluidly connected to at least one fluid inlet line and at least one fluid outlet line;

at least one reciprocating pressure displacement membrane pump within said housing, said pump being arranged to pump a first fluid from said fluid inlet line to said fluid outlet line via the main flow path;

a fluid port communicating through the first face of the housing with a second flow path in the housing; and

at least one metering pump, said metering pump being arranged to pump a second fluid through the fluid port to the second flow path, wherein

said second flow path is in fluid communication with said fluid outlet line.

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

a cavity having a curved rigid chamber wall; and

a flexible membrane attached to said rigid chamber wall, wherein a first side of said flexible membrane and a first chamber of said rigid chamber wall define a pumping chamber, and an opposing second side of said flexible membrane and a second chamber of said rigid chamber wall define an actuation chamber.

3. The cassette claimed in claim 1 further comprising an air vent fluidly connected to said second flow path.

4. The cassette claimed in claim 3 further comprising an air filter connected to said air vent.

5. The cassette claimed in claim 1 further comprising a container attachment comprising:

a container support device for receiving and supporting a container containing a second fluid.

6. The cassette claimed in claim, 1 further comprising at least one valve interposed between the main flow path and the second flow path.

7. The cassette claimed in claim 6 wherein said at least one valve comprises a valve housing having a membrane, said membrane dividing said housing into an actuation chamber and a liquid chamber.

8. The cassette claimed in claim 7 wherein said actuation chamber comprises at least one port and said liquid chamber comprises at least one port.

9. The cassette claimed in claim 8 wherein said liquid chamber comprises two ports.

10. The cassette claimed in claim 9 wherein an inner wall of said liquid chamber comprises a substantially smooth surface.

16. The pump cassette claimed in claim 6, wherein the midplate comprises at least one valving chamber forming the at least one valve interposed between the main flow path and the second flow path.

19. The pump cassette claimed in claim 6, wherein the fluid port communicating through the first face of the housing comprises a hollow spike.

11. A pump cassette comprising:

a housing having a top plate forming a first face of the housing, a bottom plate forming an opposing second face of the housing, and a midplate positioned between the top plate and the bottom plate,

the housing comprising;

a main flow path fluidly connected to at least one fluid inlet line and at least one fluid outlet line;

at least one reciprocating pressure displacement membrane pump within said housing, said pump being arranged to pump a first fluid from said fluid inlet line to said fluid outlet line via the main flow path;

a second flow path within said housing, said second flow path being in fluid communication with the first flow path and comprising;

a metering membrane pump;

a second fluid inlet line for pumping a volume of a second fluid into said fluid outlet line, said second fluid inlet line entering the housing through the first face of said housing;

a fluid port in fluid communication of said second fluid into with said second fluid inlet line; and

an air vent to in fluid communication with said second fluid inlet line, wherein

said metering membrane pump is configured to infuse a quantity of a second liquid via the fluid port into the main flow path.

12. The cassette claimed in claim 11 wherein said reciprocating pressure displacement pump comprises:

a curved rigid chamber wall; and

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

17. The pump cassette claimed in claim 11, wherein the midplate comprises at least one valving chamber forming at least one valve interposed between the main flow path and the second flow path.

20. The pump cassette claimed in claim 11, wherein the fluid port in fluid communication with the second fluid inlet line comprises a hollow spike.

13. A blood pump cassette comprising:

a cassette housing having a top plate forming a first face of the housing, a bottom plate forming an opposing second face of the housing, and a midplate positioned between the top plate and the bottom plate, the housing comprising at least one blood inlet line for pumping blood from a patient and one blood outlet line for pumping blood to a dialyzer;

at least two reciprocating pressure displacement membrane pumps within said housing, said pumps being arranged to pump blood from a patient to the dialyzer;

at least two valves, said valves comprising;

a valve housing; and

a membrane, said membrane dividing said valve housing into two chambers, an actuation chamber and a liquid chamber, said actuation chamber having at least one port and said liquid chamber having at least two ports, and wherein said liquid chamber comprises a substantially smooth surface; and

a heparin administering system within the cassette housing comprising;

a membrane-based pump;

a heparin inlet line for pumping a volume of heparin into the blood outlet line;

a fluid port through the first face of the cassette housing for fluid communication of between a source of heparin and said heparin inlet line; and

an air vent and filter fluidly connected to said heparin inlet line.

14. The cassette claimed in claim 13 wherein said reciprocating pressure displacement pumps comprise:

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 reciprocating pressure displacement membrane pumps comprise a membrane having raised features on at least one surface.

18. The blood pump cassette claimed in claim 13, wherein the actuation chamber of the valve housing is formed in the bottom plate and the liquid chamber of the valve housing is formed in the midplate.

21. The blood pump cassette claimed in claim 13, wherein the fluid port through the first face of the cassette housing for fluid communication between the source of heparin and the heparin inlet line comprises a hollow spike.

22. The blood pump cassette claimed in claim 15, wherein the raised features are selected from the group consisting of:

rings, ribs, dimples, and dots.